Quantum Entanglement Enhanced Radar

Abstract

A radar time synchronization system according to an exemplary embodiment of the present disclosure includes a transmitting radar, a receiving radar, and a quantum interference device communicatively coupled to the transmitting radar and the receiving radar. The quantum interference device includes a quantum entanglement source operable to communicate first entangled photons to the transmitting radar and to communicate second entangled photons to the receiving radar. The quantum interference device further includes a quantum entanglement detector operable to receive the first entangled photons from the transmitting radar and the second entangled photons from the receiving radar. The quantum entanglement detector is further operable to detect a quantum interference effect associated with the first entangled photons and the second entangled photons. The quantum interference device synchronizes a first time associated with the transmitting radar and a second time associated with the receiving radar based at least in part on the quantum interference effect.

Description

[Technical Field]

[0001] [Priority Claim] This application is based on and claims priority to U.S. Provisional Application No. 63 / 75984, filed November 5, 2021, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates generally to radar systems, and more particularly to quantum entanglement enhanced radar systems. [Background technology]

[0003] Since the invention of bistatic radar, clock synchronization has been a cornerstone of the field for creating accurate baselines between two or more radar stations and for determining signal arrival times. A problem with existing bistatic and / or multistatic radar systems is that the clocks associated with the transmitter and receiver radars in such systems are not accurately and / or precisely synchronized, resulting in inaccurate measurements of target velocity and / or position. Summary of the Invention [Means for solving the problem]

[0004] Aspects and advantages of embodiments of the present disclosure are set forth in part in the description that follows, and may be learned from the description, or may be learned by practice of the embodiments.

[0005] A radar time synchronization system according to an exemplary embodiment of the present disclosure may include a transmitting radar. The radar time synchronization system may further include a receiving radar. The radar time synchronization system may further include a quantum interferometer device that may be communicatively coupled to the transmitting radar and the receiving radar. The quantum interference device may include a quantum entanglement source operable to transmit first entangled photons to the transmitting radar and transmit second entangled photons to the receiving radar. The quantum interference device may further include a quantum entanglement detector operable to receive the first entangled photons from the transmitting radar and the second entangled photons from the receiving radar. The quantum entanglement detector may further be operable to detect a quantum interference effect associated with the first entangled photons and the second entangled photons. The quantum interference device may synchronize a first time associated with the transmitting radar and a second time associated with the receiving radar based at least in part on quantum interference effects associated with the first entangled photon and the second entangled photon.

[0006] A method for synchronizing time in a radar system according to an exemplary embodiment of the present disclosure may include, by a quantum entanglement source of the radar system, transmitting first entangled photons to a transmitting radar and transmitting second entangled photons to a receiving radar. The method may further include receiving, by a quantum entanglement detector of the radar system, the first entangled photons from the transmitting radar and the second entangled photons from the receiving radar. The method may further include detecting, by the quantum entanglement detector, quantum interference effects associated with the first entangled photons and the second entangled photons. The method may further include, by a quantum interference device including the quantum entanglement source and the quantum entanglement detector, synchronizing a first time associated with the transmitting radar and a second time associated with the receiving radar based at least in part on quantum interference effects associated with the first entangled photons and the second entangled photons.

[0007] These and other features, aspects, and advantages of various embodiments of the present disclosure will become more fully understood with reference to the following description and appended claims. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain relevant principles of the present disclosure.

[0008] A detailed description of the embodiments directed to those skilled in the art is provided herein and should be read in conjunction with the accompanying drawings. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 illustrates an exemplary, non-limiting system that can facilitate quantum entanglement-enhanced clock synchronization in a radar system in accordance with one or more exemplary embodiments of the present disclosure. [Figure 2] 2 illustrates an example of an exemplary, non-limiting apparatus of the exemplary, non-limiting system of FIG. 1 that can facilitate quantum entanglement-enhanced clock synchronization in a radar system according to one or more exemplary embodiments of the present disclosure. [Figure 3] 1 illustrates a flow diagram of an exemplary, non-limiting method that may be implemented to facilitate quantum entanglement-enhanced clock synchronization in a radar system in accordance with one or more exemplary embodiments of the present disclosure. [Figure 4] FIG. 1 illustrates a block diagram of an exemplary, non-limiting computing environment that can facilitate quantum entanglement-enhanced clock synchronization in a radar system in accordance with one or more exemplary embodiments of the present disclosure. [Figure 5] FIG. 1 illustrates a block diagram of an exemplary, non-limiting computing device that can facilitate quantum entanglement-enhanced clock synchronization in a radar system in accordance with one or more exemplary embodiments of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0010] Repeat use of reference characters in the present specification and the accompanying drawings is intended to represent the same or analogous features or elements of the present disclosure.

[0011] Reference will now be made in detail to the embodiments, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation of the embodiments and is not intended to limit the present disclosure. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments without departing from the scope or spirit of the present disclosure. For example, features illustrated or described as part of one embodiment can be used with another embodiment to yield still further embodiments. Accordingly, it is intended that aspects of the present disclosure cover such modifications and variations.

[0012] Unless otherwise specified, as used herein, approximation terms such as "approximately," "substantially," and / or "about" mean within 10 percent (%) of the stated value. As referred to herein, the terms "or" and "and / or" are generally intended to be inclusive (i.e., "A or B" or "A and / or B" are intended to mean "A or B or both," respectively). As referred to herein, terms such as "first," "second," and "third" can be used interchangeably to distinguish one element from another and are not intended to denote the location or importance of individual elements.

[0013] As used herein, the terms “couple,” “couples,” “coupled,” and / or “coupling” refer to chemical coupling (e.g., chemical bonding), communicative coupling, electrical and / or electromagnetic coupling (e.g., capacitive coupling, inductive coupling, direct coupling, and / or coupled coupling, etc.), mechanical coupling, operative coupling, optical coupling, and / or physical coupling. As referred to herein, the term “entity” refers to a human being, a user, an end user, a consumer, a computing device and / or program (e.g., a processor, computer hardware and / or software, application, etc.), an agent, a machine learning (ML) and / or artificial intelligence (AI) algorithm, model, system, and / or application, and / or another type of entity capable of implementing one or more embodiments of the present disclosure as described herein, illustrated in the accompanying drawings, and / or included in the appended claims.

[0014] Exemplary aspects of the present disclosure are directed to radar time synchronization systems. Clock synchronization between transmitter (Tx) and receiver (Rx) radars in existing bistatic and / or multistatic radar systems is one of the major limitations for measuring target velocity and / or position. Global Positioning Systems (GPS) and atomic clock synchronization are limited, providing accuracy on the order of tens of nanoseconds in the time period relevant to radar operation.

[0015] A radar time synchronization system according to one or more embodiments of the present disclosure may use quantum entanglement of photons to overcome the above-mentioned limitations and provide picosecond-level clock synchronization even in environments where GPS is unavailable. As described herein, a radar time synchronization system according to one or more embodiments of the present disclosure may achieve this by exploiting the inherent quantum correlation between two entangled photons, one of which may be sent to a transmitting radar and the other to a receiving radar. Additionally, this may be achieved by coupling a radar system (e.g., any standard radar system) to an interferometer, such as a Hong-Ou-Mandel (HOM) interferometer. The HOM interferometer, commonly known as the HOM dip, is highly sensitive to the phase difference between the two entangled photons. A radar time synchronization system according to one or more embodiments of the present disclosure may utilize the HOM dip to synchronize a first time associated with a transmitting radar and a second time associated with a receiving radar. The HOM dip is on the order of picoseconds, corresponding to a baseline error between the transmitting and receiving radars of less than 100 microns in accordance with one or more embodiments of the present disclosure. As described herein, a radar time synchronization system in accordance with one or more embodiments of the present disclosure may reduce the timing stability of a typical bistatic radar to less than 1 picosecond and / or absolute timing accuracy to less than 100 picoseconds in GPS-unavailable environments.

[0016] A radar time synchronization system according to one or more embodiments of the present disclosure may improve existing high-precision clocks, for example, by using quantum entanglement. According to one or more embodiments of the present disclosure, the radar time synchronization system described herein can improve clock synchronization by orders of magnitude by leveraging quantum entanglement. Additionally and / or alternatively to embodiments of the present disclosure, the radar time synchronization system described herein can further utilize one or more volume holographic elements coupled with interference effects (e.g., quantum interference effects), such as the Hong-Au-Mandel (HOM) interference effect between entangled photons, to baseline the radar system between stations with unprecedented precision. According to one or more embodiments of the present disclosure, for security purposes, the relatively high degree of clock synchronization achievable using the radar time synchronization system described herein can potentially facilitate relatively short code validity periods and / or provide a radar system that is relatively resistant to radar jamming, and can facilitate relatively long autonomy periods even in GPS-unavailable environments. A radar time synchronization system according to one or more embodiments of the system of the present disclosure may be independent of GPS and / or independent of any other external timing system (e.g., operationally independent of GPS timing and / or any other external timing system).

[0017] As described below, to facilitate the above-described operations and / or technical effects, a radar time synchronization system according to one or more embodiments of the present disclosure may utilize volume holography, quantum optics, and bistatic radar technologies to provide a quantum entanglement-enhanced timing system that may be implemented in a radar system (e.g., a bistatic radar system, a multistatic radar system, etc.).

[0018] 1 illustrates a non-limiting example system 100 that can facilitate quantum entanglement-enhanced clock synchronization in a radar system in accordance with one or more embodiments of the present disclosure. In one or more embodiments of the present disclosure, system 100 may constitute a radar system that can include a radar time synchronization system, such as those described above, that can facilitate quantum entanglement-enhanced clock synchronization in such a radar system.

[0019] According to one or more exemplary embodiments of the present disclosure, system 100 may comprise and / or include a quantum entanglement-enhanced timing radar system that can utilize quantum entanglement of photons to facilitate improved time synchronization between transmitting radar 102 and receiving radar 104. As shown in the exemplary embodiment depicted in FIG. 1 , system 100 may include a quantum interference device 106 that can comprise and / or include, for example, a quantum Hon-Au-Mandel (HOM) interferometer device. In this exemplary embodiment, quantum interference device 106 may include a quantum entanglement source 108 and / or a quantum entanglement detector 110. According to one or more embodiments of the present disclosure, quantum interference device 106 may be communicatively coupled to transmitting radar 102 and receiving radar 104. For example, quantum entanglement source 108 and / or quantum entanglement detector 110 of quantum interference device 106 may be communicatively coupled to transmitting radar 102 and / or receiving radar 104, as shown in the exemplary embodiment depicted in FIG. 1 .

[0020] In one or more embodiments of the present disclosure, system 100 can facilitate improved time synchronization between transmitting radar 102 and receiving radar 104, as described above, for example, by using one or more fiber optic links and / or one or more free-space optical links between quantum entanglement source 108, transmitting radar 102, and / or receiving radar 104. As described below, in one or more embodiments of the present disclosure, quantum entanglement source 108 may be operable to transmit first entangled photons to transmitting radar 102 and transmit second entangled photons to receiving radar 104 (e.g., via a signal, light, and / or laser beam, etc.). In one or more of these embodiments, quantum entanglement detector 110 may be operable to receive the first entangled photons from transmitting radar 102 and / or the second entangled photons from receiving radar 104 (e.g., via a reflected signal, reflected light, and / or laser beam, etc.). In one or more of these embodiments, quantum entanglement detector 110 may further be operable to detect quantum interference effects (e.g., the HOM dip described above) that may be associated with the first and second entangled photons. In one or more of these embodiments, quantum interference device 106 may synchronize a first time associated with transmitting radar 102 and a second time associated with receiving radar 104 based at least in part on such quantum interference effects that may be associated with the first and second entangled photons (e.g., based at least in part on the detection and / or retention of the HOM dip described above).

[0021] In one or more embodiments of the present disclosure, quantum interference device 106 and / or quantum entanglement detector 110 may include a controllable optical delay component, such as, for example, a controllable optical delay and / or a feedback loop, as described below with reference to the exemplary embodiment depicted in Figure 2. In one or more of these embodiments, such a controllable optical delay may be operable to receive the first entangled photon and / or the second entangled photon as described above, and / or may be operable to track quantum interference associated with the first entangled photon and the second entangled photon (e.g., the HOM dip described above) to further detect quantum interference effects.

[0022] 1 , a lab station (not shown or noted in FIG. 1 ) may include a quantum interference device 106, a quantum entanglement source 108, and / or a quantum entanglement detector 110. The transmitting radar 102 and / or the receiving radar 104, according to one or more embodiments of the present disclosure, may be located a particular distance away from each other and / or from the lab station (e.g., from the quantum interference device 106, the quantum entanglement source 108, and / or the quantum entanglement detector 110). In one or more embodiments of the present disclosure, the quantum entanglement source 108 may generate entangled photons and direct a first one of such entangled photons to the receiving radar 104 and a second one of such entangled photons to the transmitting radar 102. In one or more of these embodiments, the first entangled photon and / or the second entangled photon may be reflected back to the quantum entanglement detector 110, for example, using one or more cube corner reflectors associated with the transmitting radar 102 and / or the receiving radar 104. In one or more of these embodiments, upon receiving the reflected first entangled photon and / or the second entangled photon, the quantum interference device 106 and / or the quantum entanglement detector 110 may track and / or detect quantum interference, which may constitute, for example, a HOM dip as described above.

[0023] According to one or more embodiments of the present disclosure, if HOM interference is detected (e.g., observed), then this may indicate that the distance traversed from the lab station (e.g., quantum interference device 106) to the receiving radar 104 is equal to the distance traveled (e.g., within a coherence length, typically in the femtosecond range) between the lab station (e.g., quantum interference device 106) and the transmitting radar 102. However, in one or more embodiments, the two distances may not be equal and / or may be time varying. To overcome this problem, according to one or more embodiments of the present disclosure, the quantum interference device 106 (e.g., via the quantum entanglement source 108 and / or the quantum entanglement detector 110) may time tag (e.g., timestamp) the entangled photons and / or may introduce a controllable optical delay (Δt ) in one or both arms, for example, between the transmitting radar 102 and the quantum entanglement detector 110 and / or between the receiving radar 104 and the quantum entanglement detector 110. delay ) may be utilized. A controllable optical delay in accordance with one or more embodiments of the present disclosure can track (e.g., actively, in real-time, continuously, periodically, etc.) the HOM dip and maintain the transmitting radar 102 and receiving radar 104 within a relatively tight time tolerance and, taking into account the speed of light, maintain them within a known and trackable baseline separation, which can be expressed mathematically as follows:

[0024]

number

[0025] In one or more embodiments of the present disclosure, it may be this delay that can correct clock synchronization and thus provide an accurate clock (e.g., an accurate Einstein clock) between the transmitting radar 102 and the receiving radar 104.

[0026] To align the quantum entanglement source 108 and the quantum entanglement detector 110, in one or more embodiments, the system 100 may use a volume holographic Bragg grating and / or a cube corner reflector to linearly align the lab station (e.g., the quantum interference device 106), the transmitting radar 102, and the receiving radar 104, and / or to generate idler laser pulses at the pump frequency of the quantum entanglement source 108 (e.g., the system 100 may remove it from the detector of the quantum entanglement source 108 using, for example, long-pass and notch filters). In one or more embodiments of the present disclosure, the system 100 (e.g., via the quantum interference device 106 and / or the quantum entanglement detector 110) can use these pump photons to synchronize the clocks associated with the transmitting radar 102 and the receiving radar 104 to within the accuracy of current atomic clocks as a baseline to facilitate the search for the HOM dip. A volume holographic grating according to one or more embodiments of the present disclosure can multiplex and / or send the pump beam to a remote monitoring detector while sending the idler and down-converted entangled photons of the signal to the quantum entanglement source 108. In one or more embodiments of the present disclosure, this can achieve a collinearly accurate baseline between the lab station (e.g., quantum interference device 106), the receiving radar 104, and the transmitting radar 102, all of which can be synchronized within the HOM dip window. In an exemplary embodiment, the above operation may be expressed as follows:

[0027]

number

[0028]

number

[0029]

number

[0030] This gives the following desired results:

number

[0031] Based at least in part on the implementation of the above-described operations and / or equations, system 100 can accurately co-locate a lab station (e.g., quantum interference device 106) and transmit radar 102 (and / or, in some embodiments, receive radar 104) by placing them on the same optical bench, thereby achieving accuracy within HOM dip tolerances.

number

number

[0032] In one or more embodiments of the present disclosure, the system 100 does not co-locate the lab station (e.g., quantum interference device 106), the transmitting radar 102, and / or the receiving radar 104, and the system 100 uses a Δt to properly synchronize the atomic station clocks between the transmitting radar 102 and the receiving radar 104, as shown in FIG. delayIn some exemplary embodiments, the transmitting radar 102 can communicate with the receiving radar 104 via classical communication (e.g., a classical communication protocol), for example, using a pump beam to generate spontaneous parametric down-conversion of entangled photons. This may be expressed as follows:

[0033]

number

[0034] According to one or more embodiments of the present disclosure, the ΔL achievable from HOM techniques (e.g., observation of the HOM dip) delay can approach 10 femtoseconds over optical fiber separated by 4 km. It should be understood that system 100 can be implemented in free-space optics applications and / or be applicable to ground-to-ground, ground-to-space, air-to-space, and / or ground-to-air bistatic radar stations. While system 100 according to one or more embodiments of the present disclosure can achieve sub-femtosecond resolution by scanning and / or tracking HOM dips, system 100 may also utilize the HOM effect to achieve attosecond resolution in one or more other embodiments described herein, allowing for a reduction in the size of the bistatic radar baseline while maintaining a certain degree of accuracy.

[0035] 2 is a diagram illustrating an example non-limiting apparatus 200 of the non-limiting system of FIG. 1 that can facilitate quantum entanglement-enhanced clock synchronization in a radar system in accordance with one or more exemplary embodiments of the present disclosure. According to one or more embodiments of the present disclosure, apparatus 200 may constitute and / or include quantum entanglement detector 110 described above and shown in FIG. 1.

[0036] As shown in the exemplary embodiment depicted in FIG. 2 , apparatus 200 may include a feedback loop 202 coupled to a controllable optical delay element 204 and / or a photon time tagger 206, where photon time tagger 206 may be further coupled to a first detector 208 a (labeled “Detector A” in FIG. 2 ) and / or a second detector 208 b (labeled “Detector B” in FIG. 2 ). In this exemplary embodiment, and as described above with reference to FIG. 1 , controllable optical delay element 204 may be operable to receive a first entangled photon, which may be reflected from, for example, receiving radar 104, and / or a second entangled photon, which may be reflected from, for example, transmitting radar 102. In this embodiment, and as described above with reference to FIG. 1 , controllable optical delay element 204 may further be operable to track quantum interference that may be associated with the first entangled photon and the second entangled photon to detect the quantum interference effects (e.g., HOM dip) described above. In one or more embodiments of the present disclosure, for example, the system 100 described above may utilize the feedback loop 202, the controllable optical delay component 204, and / or the photon time tagger 206 of the quantum entanglement detector 110 to provide a controllable optical feedback loop capable of preserving the quantum interference effect described above upon detection (e.g., capable of preserving the HOM dip upon detection by the quantum entanglement detector 110).

[0037] It should be appreciated that a radar time synchronization system according to one or more exemplary embodiments of the present disclosure may be implemented in radar systems, such as system 100 and / or bistatic radar systems, to improve such radar systems using the enhanced time synchronization provided by the quantum-optical HOM interference effect of entangled photons. For example, a radar time synchronization system according to one or more exemplary embodiments of the present disclosure may be provided in a bistatic radar as an add-on that can improve the accuracy of any existing classical bistatic radar system by utilizing quantum optics and / or volume holography.

[0038] 3 illustrates a flow diagram of a non-limiting example method that may be implemented to facilitate quantum entanglement-enhanced clock synchronization in a radar system according to one or more embodiments of the present disclosure. According to one or more embodiments of the present disclosure, method 300 may be implemented, for example, by using system 100, transmitting radar 102, receiving radar 104, quantum interference device 106, quantum entanglement source 108, quantum entanglement detector 110, and / or device 200, as described above and shown in FIGS. 1 and 2. According to one or more embodiments of the present disclosure, method 300 may be implemented to facilitate quantum entanglement-enhanced clock synchronization in a radar system, such as system 100.

[0039] At 302 in the exemplary embodiment shown in FIG. 3, the method 300 may include a step of a quantum entanglement source (e.g., quantum entanglement source 108) of a radar system (e.g., system 100) communicating a first entangled photon to a transmitting radar (e.g., transmitting radar 102) and communicating a second entangled photon to a receiving radar (e.g., receiving radar 104).

[0040] At 304 in the exemplary embodiment shown in FIG. 3, the method 300 may include receiving, by a quantum entanglement detector (e.g., quantum entanglement detector 110) of the radar system, a first entangled photon from the transmitting radar and a second entangled photon from the receiving radar.

[0041] At 306 in the exemplary embodiment shown in FIG. 3, the method 300 may include detecting, with a quantum entanglement detector, a quantum interference effect (e.g., the HOM dip described above) associated with the first entangled photon and the second entangled photon.

[0042] At 308 in the exemplary embodiment shown in FIG. 3 , the method 300 may include synchronizing, by a quantum interference device (e.g., quantum interference device 106) comprising a quantum entanglement source and a quantum entanglement detector, a first time associated with the transmitting radar and a second time associated with the receiving radar based at least in part on quantum interference effects associated with the first entangled photon and the second entangled photon.

[0043] 4 illustrates a block diagram of an example non-limiting computing environment 400 that can be adapted to facilitate quantum entanglement-enhanced clock synchronization in a radar system in accordance with one or more exemplary embodiments of the present disclosure. In the exemplary embodiment illustrated in FIG. 4, computing environment 400 may include system 100, network 402, computing system 410, one or more computing devices 412, one or more processors 414, one or more memory devices 416, data 418, instructions 420, remote computing system 430, one or more computing devices 432, one or more processors 434, one or more memory devices 436, data 438, instructions 440, one or more computing devices 452, one or more processors 454, one or more memory devices 456, data 458, and / or instructions 460, as described above and shown in FIG. 1.

[0044] Network 402, according to one or more embodiments of the present disclosure, may include any type of communications network. For example, in some embodiments, network 402 may include a local area network (LAN), a wide area network (WAN), an intranet, an extranet, and / or the Internet. Furthermore, in at least one embodiment, network 402 may include any number of wired or wireless communications and / or links that may be used to communicate with one or more systems (e.g., computer system 410, remote computer system 430, system 100) and / or one or more devices (e.g., one or more computing devices 452). Communications over network 402 according to one or more embodiments of the present disclosure may be performed via any type of wired and / or wireless communication and / or may use a wide variety of communication protocols (e.g., Transmission Control Protocol / Internet Protocol (TCP / IP), HyperText Transfer Protocol (HTTP), Simple Mail Transfer Protocol (SMTP), File Transfer Protocol (FTP)), encodings or formats (e.g., HyperText Markup Language (HTML), Extensible Markup Language (XML)), and / or protection schemes (e.g., Virtual Private Network (VPN), Secure HTTP, Secure Sockets Layer (SSL)).

[0045] In accordance with one or more embodiments of the present disclosure, computer system 410 may include any combination of systems and / or devices, including one or more computer systems and / or one or more computer devices. Additionally, in some embodiments, computer system 410 may be coupled (e.g., networked) to one or more computer systems and / or one or more computer devices via network 402. As shown in FIG. 4 , computer system 410 may be directly (e.g., via a wired connection) and / or indirectly (e.g., via network 402) coupled (e.g., communicatively, operatively) to system 100 and / or one or more components thereof (e.g., the bistatic radar system, transmit radar 102, receive radar 104, quantum interference device 106, quantum entanglement source 108, and quantum entanglement detector 110 of system 100).

[0046] Computer system 410 may operate in a variety of different configurations, including as a server or a client machine in a client-server network environment, or as a peer machine in a peer-to-peer (or distributed) network environment. Although computer system 410 is depicted as a single device in Figure 4, computer system 410 according to one or more embodiments of the present disclosure may include any collection or combination of devices that, individually or in combination with other devices, execute one or more sets of instructions to perform any of the operations described herein.

[0047] In this example, computer system 410 may include one or more computing devices 412, which may include any type of computing device. For example, one or more computing devices 412 may include a personal computing device (e.g., a desktop computing device), a mobile computing device (e.g., a smartphone or tablet), a wearable computing device (e.g., a smart watch), an embedded computing device, a web appliance, a server, a network router, a switch, a bridge, or any device capable of executing an instruction set (e.g., any combination of instructions, which may include sequential and / or parallel instructions) related to one or more operations and / or one or more actions performed by computer system 410 or any component and / or device of computer system 410.

[0048] 4, the one or more computing devices 412 may include one or more processors 414. In at least one embodiment described herein, the one or more processors 414 may be and / or include any processing device (e.g., a processor core, a microprocessor, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), a controller, or a microcontroller) and may include one or more processors that may be coupled (e.g., operatively connected) to one another. In some embodiments, the one or more processors 414 may include one or more complex instruction set computing (CISC) microprocessors, one or more reduced instruction set computing (RISC) microprocessors, one or more very long instruction word (VLIW) microprocessors, and / or one or more processors configured to execute other instruction sets.

[0049] In at least one embodiment of the present disclosure, the one or more computing devices 412 may include one or more memory devices 416. In one or more of these embodiments, the one or more memory devices 416 may be used to store data and / or information and may include one or more computer-readable media, one or more non-transitory computer-readable media, one or more non-transitory computer-readable storage media, and / or one or more machine-readable media. While the one or more memory devices 416 are shown in FIG. 4 as a single unit (e.g., a single medium), the computer-readable storage medium according to one or more embodiments of the present disclosure may include a single or multiple media (e.g., a centralized or distributed database and / or associated caches and servers) capable of storing one or more sets of instructions. Furthermore, in one or more of these embodiments, the computer-readable storage medium may include any medium capable of storing, encoding, and / or carrying a set of instructions executed by a computing device and / or causing a computing device to perform one or more of the operations described herein. In some embodiments, the computer-readable storage medium may include one or more solid-state memories, one or more optical media, and / or one or more magnetic media.In at least one embodiment described herein, the one or more memory devices 416 may include, for example, random access memory (RAM), read only memory (ROM), erasable programmable read only memory (EPROM), electrically erasable programmable read only memory (EEPROM), one or more flash memory devices, one or more magnetic storage devices (e.g., one or more hard disk drives), and / or other types of memory devices.

[0050] According to at least one embodiment described herein, one or more processors 414 may be configured to execute one or more instructions to perform the operations described herein, including, for example, one or more operations related to facilitating quantum entanglement-enhanced clock synchronization in a radar system. For example, in this or other embodiments, one or more processors 414 may be configured to execute one or more instructions to perform the operations described herein, including, for example, one or more operations related to facilitating quantum entanglement-enhanced clock synchronization in a radar system. Additionally, one or more memory devices 416 may store data 418 and / or instructions 420, which may be executed by one or more processors 414 to cause one or more computing devices 412 to perform one or more operations.

[0051] Data 418, according to one or more embodiments of the present disclosure, may include operational data. For example, in at least one embodiment, data 418 may constitute and / or include operational data associated with and / or that may be used to operate system 100 and / or one or more components thereof to facilitate quantum entanglement-enhanced clock synchronization in a radar system, as described above with reference to the exemplary embodiment depicted in FIG. 1. In some embodiments, data 418 may constitute and / or include operational data such as operational parameters associated with and / or that may be used to operate transmitting radar 102, receiving radar 104, quantum interference device 106, quantum entanglement source 108, and / or quantum entanglement detector 110 to facilitate quantum entanglement-enhanced clock synchronization in a radar system, as described above with reference to the exemplary embodiment depicted in FIG. 1. In some embodiments, data 418 may constitute and / or include one or more equations described herein, such as Equations 1, 2, 3, 4, 5, and / or 6, as described above with reference to the exemplary embodiment depicted in FIG. 1. In some embodiments, data 418 may constitute and / or include one or more input and / or output parameters and / or values ​​of such formulas described herein (e.g., Formulas 1, 2, 3, 4, 5, and / or 6).

[0052] In accordance with at least one embodiment of the present disclosure, instructions 420 may include one or more instructions for using data, including data 418, to perform one or more operations described herein. For example, in this and / or other embodiments, instructions 420 may include instructions for generating (e.g., driving) and / or implementing (e.g., executing, computing) one or more equations described herein (e.g., Equations 1, 2, 3, 4, 5, and / or 6) to facilitate quantum entanglement-enhanced clock synchronization in a radar system. Additionally or alternatively, in this and / or other embodiments, instructions 420 may constitute and / or include computer and / or machine-readable instructions (e.g., software, code, processing threads) that may be executed by one or more processors 414 to operate system 100 and / or one or more components thereof (e.g., the bistatic radar system, transmitting radar 102, receiving radar 104, quantum interference device 106, quantum entanglement source 108, quantum entanglement detector 110 of system 100) to facilitate quantum entanglement-enhanced clock synchronization in a radar system, as described above with reference to FIG. 1 .

[0053] In some embodiments, one or more memory devices 416 may be used to store one or more applications that may be run by one or more processors 414. In at least one embodiment described herein, the data 418, instructions 420, and / or one or more applications may be related to quantum entanglement-enhanced clock synchronization in a radar system. Furthermore, in some embodiments, the computer system 410 may be configured to manage one or more applications. For example, in these embodiments, the computer system 410 may perform one or more operations related to facilitating quantum entanglement-enhanced clock synchronization in a radar system. For example, in these or other embodiments, the computer system 410 may perform one or more operations related to operating the system 100 and / or one or more components thereof according to the exemplary embodiment shown in FIGS. 1, 2, and 3 and described above.

[0054] As shown in the exemplary embodiment depicted in FIG. 4 , the one or more computing devices 412 may include one or more input devices 422 and / or one or more output devices 424. According to at least one embodiment described herein, the one or more input devices 422 may be configured to receive input (e.g., tangible input) and may include one or more touchscreens, one or more keyboards, one or more pointing devices (e.g., mouse devices), one or more buttons, one or more microphones, and / or one or more cameras. In one or more embodiments of the present disclosure, the one or more output devices 424 may include one or more display devices, one or more loudspeaker devices, one or more tactile output devices, and / or other output devices. By way of example, in some embodiments, the one or more output devices 424 may be used to display a graphical user interface (GUI) via a display device that may include a touchscreen layer that may be configured to detect one or more tangible inputs.

[0055] Remote computer system 430, according to one or more embodiments of the present disclosure, may include one or more computing devices 432. In at least one embodiment described herein, one or more computing devices 432 may each include one or more processors 434, one or more memory devices 436, data 438, and / or instructions 440. In at least one embodiment of the present disclosure, one or more processors 434, one or more memory devices 436, data 438, and / or instructions 440 may each include any characteristics and / or functionality of one or more processors 414, one or more memory devices 416, data 418, and / or instructions 420. For example, in an embodiment, data 438 and / or instructions 440 may constitute and / or include the same data as data 418 and / or the same instructions as instructions 420, respectively. Additionally, in one or more embodiments described herein, one or more processors 434 and / or one or more memory devices 436 may each be configured to perform any of the operations performed by one or more processors 414 and / or one or more memory devices 416.

[0056] In one or more embodiments of the present disclosure, remote computer system 430 may include any of the features and / or functionality of computer system 410 and / or may be configured to perform any of the operations performed by computer system 410. Furthermore, in at least one embodiment, remote computer system 430 may communicate with one or more devices and / or one or more systems via network 402. Remote computer system 430, in accordance with one or more embodiments of the present disclosure, may include one or more applications (e.g., computer software applications) that may be stored and / or executed by remote computer system 430. Furthermore, in some embodiments, the one or more applications may include one or more applications that may be accessed from computer system 410 and / or that may be run at least in part from remote computer system 430.

[0057] In one or more embodiments of the present disclosure, one or more computing devices 452 may each include one or more processors 454, one or more memory devices 456, data 458, and / or instructions 460. In at least one embodiment of the present disclosure, one or more processors 454, one or more memory devices 456, data 458, and / or instructions 460 may each include any of the characteristics and / or functionality of one or more processors 414, one or more memory devices 416, data 418, and / or instructions 420. For example, in an embodiment, data 458 and / or instructions 460 may each constitute and / or include the same data as data 418 and / or the same instructions as instructions 420. Furthermore, in one or more embodiments described herein, one or more processors 454 and / or one or more memory devices 456 may each be configured to perform any of the operations performed by one or more processors 414 and / or one or more memory devices 416.

[0058] In at least one embodiment, one or more computing devices 452 may each communicate with one or more devices and / or one or more systems via network 402. For example, as shown in Figure 4, one or more computing devices 452 may be directly (e.g., via a wired connection) and / or indirectly (e.g., via network 402) coupled (e.g., communicatively, operatively) to system 100 and / or one or more components thereof (e.g., the bistatic radar system, transmit radar 102, receive radar 104, quantum interference device 106, quantum entanglement source 108, quantum entanglement detector 110 of system 100).

[0059] In some embodiments, any one or more computing devices 452 may include one or more applications (e.g., computer software applications) that may be stored and / or executed by one or more computing devices 452, respectively. Additionally, in some embodiments, the one or more applications may include one or more applications that may be accessed from computer system 410 and / or operated at least in part from any one or more computing devices 452.

[0060] In at least one embodiment of the present disclosure, a computing device 452 may be communicatively coupled (e.g., communicatively, operatively) to system 100 and / or one or more components thereof (e.g., the bistatic radar system, transmitting radar 102, receiving radar 104, quantum interference device 106, quantum entanglement source 108, quantum entanglement detector 110 of system 100) as shown in Figure 4. In this and / or other embodiments, such a computing device 452 may operate system 100 and / or one or more components thereof to facilitate quantum entanglement-enhanced clock synchronization in a radar system according to the exemplary embodiments depicted in Figures 1, 2, and 3 and described above. For example, in this and / or other embodiments, such computing device 452 may implement instructions 460 (e.g., via processor 454) using data 458 to perform one or more operations and / or implement one or more mathematical equations (e.g., Equations 1, 2, 3, 4, 5, and / or 6) to facilitate quantum entanglement-enhanced clock synchronization in a radar system, as described above with reference to FIG. 1 .

[0061] 5 illustrates a block diagram of a non-limiting example computing device 500 that can facilitate quantum entanglement-enhanced clock synchronization in a radar system in accordance with one or more exemplary embodiments of the present disclosure. The computing device 500 in accordance with one or more embodiments of the present disclosure may include one or more features and / or functionality of the computing system 410, the remote computing system 430, and / or one or more computing devices 452, as described above with reference to the exemplary embodiment illustrated in FIG. 4. Additionally, the computing device 500 may be configured to perform one or more operations and / or actions that may be performed by the computing system 410, the remote computing system 430, and / or one or more computing devices 452.

[0062] As shown in the exemplary embodiment depicted in FIG. 5 , computing device 500 may include one or more memory devices 502, data 504, instructions 506, one or more interconnects 510 (labeled “interconnect 510” in FIG. 5 ), one or more processors 520, a network interface 522, one or more mass storage devices 524, one or more output devices 526, one or more sensors 528, one or more input devices 530, and / or one or more positioning devices 532.

[0063] In one or more embodiments of the present disclosure, the one or more memory devices 502 may store information such as, for example, data 504 and / or instructions 506. Additionally, in some embodiments, the one or more memory devices 502 may include one or more non-transitory computer-readable media and / or one or more non-transitory computer-readable storage media, including RAM, ROM, EEPROM, EPROM, flash memory devices, magnetic disks, and / or combinations thereof. In at least one embodiment, the information, data (e.g., data 504) and / or instructions (e.g., instructions 506) stored by the one or more memory devices 502 may be executed by one or more processors 520 to cause the computing device 500 to perform operations, including one or more operations related to facilitating quantum entanglement-enhanced clock synchronization in a radar system. For example, in this and / or other embodiments, the data 504 and / or instructions 506 stored by the one or more memory devices 502 may be executed by one or more processors 520 to cause the computing device 500 to perform operations including one or more operations related to facilitating quantum entanglement-enhanced clock synchronization in a radar system.

[0064] Data 504, according to one or more embodiments of the present disclosure, may each include one or more portions of data (e.g., data 418, data 438, and / or data 458) and / or instructions (e.g., instructions 420, instructions 440, and / or instructions 460), which may be stored in one or more memory devices 416, one or more memory devices 436, and / or one or more memory devices 456. For example, in some embodiments, data 504 and / or instructions 506 may constitute and / or include the same data as data 418 and / or the same instructions as instructions 420. Furthermore, in some embodiments, data 504 may be received from one or more computer systems (e.g., remote computer system 430), and such one or more computer systems may be remote from computer device 500 (e.g., another room, building, part of a town, city, country).

[0065] In one or more embodiments of the present disclosure, the one or more interconnects 510 may include one or more interconnects or buses that may be used to transmit and / or receive one or more signals (e.g., electrical signals), data (e.g., data 504), and / or instructions (e.g., instructions 506) between components of the computing device 500, including one or more memory devices 502, one or more processors 520, a network interface 522, one or more mass storage devices 524, one or more output devices 526, one or more sensors 528 (e.g., a sensor array), one or more input devices 530, and / or one or more positioning devices 532. In some embodiments, the one or more interconnects 510 may be located or configured in different ways. For example, in at least one embodiment, the one or more interconnects 510 may be configured as parallel or serial connections. Additionally, in one or more embodiments, the one or more interconnects 510 may include one or more internal buses that may be used to connect internal components of the computing device 500, and / or one or more external buses that may be used to connect the computing device 500 to one or more external devices (e.g., one or more devices that may be external to the computing device 500).By way of example, in at least one embodiment, the one or more interconnects 510 may include different interfaces, which may include, for example, Industry Standard Architecture (ISA), Extended ISA, Peripheral Component Interconnect (PCI), PCI Express, Serial AT Attachment (SATA), Hyper Transport (HT), Universal Serial Bus (USB), Thunderbolt, IEEE 1394 interface (FireWire), and / or other interfaces that may be used to connect components.

[0066] According to one or more embodiments of the present disclosure, the one or more processors 520 may include one or more computer processors that may be configured to execute one or more instructions that may be stored in the one or more memory devices 502. For example, in one or more of these embodiments, the one or more processors 520 may include one or more general-purpose central processing units (CPUs), ASICs, and / or one or more graphics processing units (GPUs). Furthermore, in at least one embodiment, the one or more processors 520 may perform one or more actions and / or operations, including, for example, one or more actions and / or operations related to the data 504 and / or the instructions 506. In some embodiments, the one or more processors 520 may include single-core or multi-core devices, including microprocessors, microcontrollers, integrated circuits, and / or logic circuits.

[0067] Network interface 522, according to one or more embodiments of the present disclosure, may support network communications. In some embodiments, network interface 522 may support communications over a network, which may include, for example, a local area network and / or a wide area network (e.g., the Internet). For example, in at least one embodiment, network interface 522 may enable computing device 500 to communicate with computer system 410, remote computer system 430, one or more computing devices 452, system 100, and / or one or more components of system 100, for example, over network 402.

[0068] In one or more embodiments of the present disclosure, one or more mass storage devices 524 (e.g., hard disk drives and / or solid state drives) may be used to store information, data, and / or instructions, which may include, for example, data 504 and / or instructions 506. The one or more output devices 526, in accordance with one or more embodiments of the present disclosure, may include one or more display devices (e.g., liquid crystal display (LCD) displays, organic light-emitting diode (OLED) displays, mini-LED (light-emitting diode) displays, micro-LED displays, plasma displays, and / or cathode ray tube (CRT) displays), one or more light sources (e.g., light-emitting diodes (LEDs)), one or more loudspeakers, and / or one or more haptic output devices (e.g., one or more devices configured to generate a vibration output).

[0069] According to at least one embodiment described herein, the one or more sensors 528 may be configured to detect various conditions and / or may include one or more cameras, one or more LiDAR (light detection and ranging) devices, one or more sonar devices, and / or one or more radar devices. Additionally, in some embodiments, the one or more sensors 528 may be used to provide input (e.g., images of the entity captured using one or more cameras) that may be used as part of an entity interface (e.g., a graphical user interface (GUI)) that may be used to facilitate quantum entanglement-enhanced clock synchronization, for example, in a radar system associated with one or more embodiments of the present disclosure.

[0070] According to at least one embodiment described herein, the one or more input devices 530 may include one or more touch-sensitive devices (e.g., touchscreen displays), a mouse, a stylus, one or more keyboards, one or more buttons (e.g., ON / OFF buttons and / or YES / NO buttons), one or more microphones, and / or one or more cameras (e.g., cameras that can be used to detect gestures that can cause one or more actions by the computing device 500).

[0071] 5 shows the one or more memory devices 502 and the one or more mass storage devices 524 separately, in some embodiments, the one or more memory devices 502 and the one or more mass storage devices 524 may be regions within the same memory module. A computing device 500 according to one or more embodiments of the present disclosure may include one or more additional network interfaces, processors, and / or memory devices, which may be provided separately or on the same chip or board. In some embodiments, the one or more memory devices 502 and the one or more mass storage devices 524 may include one or more computer-readable media, which may include, for example, non-transitory computer-readable media, RAM, ROM, hard drives, flash drives, and / or other memory devices.

[0072] In accordance with one or more embodiments of the present disclosure, one or more memory devices 502 may store instruction sets for applications, which may include operating systems that may relate to various software applications and / or data. For example, in at least one embodiment, one or more memory devices 502 may store instruction sets for one or more applications that may be subject to one or more security policies that may be generated and / or implemented by computing device 500 and / or one or more other computing devices or systems. In some embodiments, one or more memory devices 502 may be used to operate and / or execute a general-purpose operating system that may operate on one or more mobile computing devices and / or stationary devices, which may include, for example, smartphones, laptop computing devices, tablet computing devices, and / or desktop computers.

[0073] Software applications that may be operated and / or executed by computing device 500 in accordance with at least one embodiment described herein may include, for example, applications associated with system 100 and / or one or more components thereof, computer system 410, remote computer system 430, and / or one or more computing devices 452, such as those described above with reference to the exemplary embodiments shown in Figures 1, 2, 3, and 4. Furthermore, in some embodiments, such software applications that may be operated and / or executed by computing device 500 may include, for example, native applications, web services, and / or web-based applications.

[0074] According to one or more embodiments of the present disclosure, the one or more positioning devices 532 may include one or more devices and / or circuitry capable of determining a location of the computing device 500. For example, in at least one embodiment, the one or more positioning devices 532 may determine the actual and / or relative location of the computing device 500 by using a satellite navigation positioning system (e.g., global positioning system (GPS), Galileo positioning system, Global Navigation satellite system (GLONASS), BeiDou Satellite Navigation and Positioning system), an inertial navigation system, a dead reckoning system, positioning based on Internet Protocol (IP) addresses, triangulation and / or proximity to cellular towers or Wi-Fi hotspots, and / or beacons.

[0075] In at least one embodiment of the present disclosure, computing device 500 may be communicatively and / or operatively coupled to system 100 and / or one or more components thereof (e.g., the bistatic radar system, transmitting radar 102, receiving radar 104, quantum interference device 106, quantum entanglement source 108, quantum entanglement detector 110 of system 100) (e.g., via a wired or wireless connection (e.g., network 402)). In this and / or other embodiments, computing device 500 may operate system 100 and / or one or more such components thereof that can facilitate quantum entanglement-enhanced clock synchronization in radar systems according to the exemplary embodiments shown in FIGS. 1, 2, and 3 and described above. For example, in this and / or other embodiments, computing device 500 may implement (e.g., via processor 520) instructions 460 using data 458 to perform one or more operations and / or implement one or more mathematical equations (e.g., Equations 1, 2, 3, 4, 5, and / or 6), such as those described above with reference to FIG. 1, to facilitate quantum entanglement-enhanced clock synchronization in a radar system.

[0076] For purposes of explanation and discussion, aspects of the present disclosure are discussed with reference to clock synchronization in radar applications. However, one skilled in the art will appreciate, using the disclosure provided herein, that aspects of the present technology can be used in other clock synchronization applications without departing from the scope of the present disclosure, such as clock synchronization between transceivers in communication technologies (e.g., wireless communications, cellular communications).

[0077] The methods described herein and / or illustrated in the accompanying figures (e.g., method 300) according to one or more exemplary embodiments of the present disclosure depict steps performed in a particular order for purposes of illustration and discussion. Those skilled in the art and having access to the disclosure provided herein will recognize that various steps of any such methods may be adapted, omitted, rearranged, include steps not shown, performed simultaneously, and / or modified in various ways without departing from the scope of the present disclosure.

[0078] While the present subject matter has been described in detail in connection with this specific exemplary embodiment, those skilled in the art will appreciate that, once they arrive at the foregoing understanding, they may readily create alternatives, modifications, and equivalents to such embodiment. Accordingly, the scope of the present disclosure is intended to be illustrative rather than limiting, and the subject matter disclosure is not intended to exclude the inclusion of such modifications, variations, and / or additions to the present subject matter as would be readily apparent to one of ordinary skill in the art.

Claims

1. 1. A radar time synchronization system, comprising: a transmitting radar; a receiving radar; a quantum interference device communicatively coupled to the transmitting radar and the receiving radar, a quantum entanglement source operable to communicate first entangled photons to the transmitting radar and second entangled photons to the receiving radar; a quantum interference device comprising: a quantum entanglement detector operable to receive the first entangled photons from the transmitting radar and the second entangled photons from the receiving radar, and further operable to detect quantum interference effects associated with the first entangled photons and the second entangled photons; the quantum interference device synchronizes a first time associated with the transmitting radar and a second time associated with the receiving radar based at least in part on the quantum interference effect associated with the first entangled photon and the second entangled photon.

2. the quantum interference device comprises a Hong-Ou-Mandel interferometer; 2. The radar time synchronization system of claim 1, wherein the quantum interference effect is the Hong-Ou-Mandel interference effect.

3. The quantum entanglement detector comprises a controllable optical delay component, operative to receive at least one of the first entangled photons or the second entangled photons; 2. The radar time synchronization system of claim 1, comprising a controllable optical delay component operable to track quantum interference associated with the first entangled photon and the second entangled photon to detect the quantum interference effect.

4. 4. The radar time synchronization system of claim 3, wherein the quantum entanglement detector further comprises a photon time tagger coupled to the controllable optical delay component, a first detector of the quantum entanglement detector, and a second detector of the quantum entanglement detector to provide a controllable optical feedback loop that preserves the quantum interference effect upon detection.

5. 10. The radar time synchronization system of claim 1, wherein the radar time synchronization system is operationally independent of at least one of a global positioning system or any external timing system.

6. further comprising a bistatic or multistatic radar system coupled to the quantum interference device; the bistatic radar system or the multistatic radar system operates based at least in part on synchronization of the first time and the second time; The radar time synchronization system of claim 1 , wherein the synchronization is based at least in part on the quantum interference effect.

7. a first optical link coupled to the transmitting radar and the quantum entanglement source; a second optical link coupled to the receiving radar and the quantum entanglement source; 10. The radar time synchronization system of claim 1, wherein at least one of the first optical link or the second optical link comprises at least one of a free space optics link or a fiber optic link.

8. further comprising one or more cube corner reflectors associated with at least one of the transmitting radar or the receiving radar; 2. The radar time synchronization system of claim 1, wherein the one or more cube corner reflectors are operable to reflect at least one of the first entangled photon or the second entangled photon, respectively, to the quantum entanglement detector.

9. 2. The radar time synchronization system of claim 1, wherein the quantum interference device synchronizes the first time and the second time to within less than 1 picosecond based at least in part on at least one of maintaining or detecting the quantum interference effect.

10. 1. A method for synchronizing a time of day in a radar system, comprising: transmitting, by a quantum entanglement source of the radar system, first entangled photons to a transmitting radar and second entangled photons to a receiving radar; receiving, by a quantum entanglement detector of the radar system, the first entangled photon from the transmitting radar and the second entangled photon from the receiving radar; detecting, with the quantum entanglement detector, a quantum interference effect associated with the first entangled photon and the second entangled photon; and synchronizing, by a quantum interference device comprising the quantum entanglement source and the quantum entanglement detector, a first time associated with the transmitting radar and a second time associated with the receiving radar based at least in part on the quantum interference effect associated with the first entangled photon and the second entangled photon.

11. the quantum interference device comprises a Hong-Ou-Mandel interferometer; The method of claim 10 , wherein the quantum interference effect is the Hong-Ou-Mandel interference effect.

12. receiving at least one of the first entangled photon or the second entangled photon with a controllable optical delay component of the quantum entanglement detector; 11. The method of claim 10, further comprising: tracking, with the controllable optical delay component, quantum interference associated with the first entangled photon and the second entangled photon to detect the quantum interference effect.

13. preserving the quantum interference effect upon detection by the quantum entanglement detector; 13. The method of claim 12, further comprising: synchronizing, by the quantum interference device, the first time and the second time to within less than 1 picosecond based at least in part on maintaining and detecting the quantum interference effect.

14. The method of claim 10 , wherein the radar system is a bistatic radar system or a multistatic radar system.

15. 1. A quantum interference device, comprising: a quantum entanglement source operable to communicate first entangled photons to a transmitting radar of a radar system and to communicate second entangled photons to a receiving radar of said radar system; a quantum entanglement detector operable to receive the first entangled photons from the transmitting radar and the second entangled photons from the receiving radar, and further operable to detect quantum interference effects associated with the first entangled photons and the second entangled photons; the quantum interference device synchronizes a first time associated with the transmitting radar and a second time associated with the receiving radar based at least in part on the quantum interference effect associated with the first entangled photon and the second entangled photon.

16. the quantum interference device comprises a Hong-Ou-Mandel interferometer; 16. The quantum interference device of claim 15, wherein the quantum interference effect is the Hong-Ou-Mandel interference effect.

17. The quantum entanglement detector comprises a controllable optical delay component, operative to receive at least one of the first entangled photons or the second entangled photons; 16. The quantum interference device of claim 15, comprising a controllable optical delay component operable to track quantum interference associated with the first entangled photon and the second entangled photon to detect the quantum interference effect.

18. 18. The quantum interference device of claim 17, wherein the quantum entanglement detector further comprises a photon time tagger coupled to the controllable optical delay component, a first detector of the quantum entanglement detector, and a second detector of the quantum entanglement detector to provide a controllable optical feedback loop that preserves the quantum interference effect upon detection.

19. 16. The quantum interference device of claim 15, wherein the quantum interference device synchronizes the first time and the second time to within less than 1 picosecond based at least in part on at least one of maintaining or detecting the quantum interference effect.

20. 16. The quantum interference device of claim 15, wherein the radar system is a bistatic radar system or a multistatic radar system.

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