Quantum teleportation system and quantum teleportation method based on same
By designing a quantum entangled light source and terminal measurement device, quantum teleportation between arbitrary nodes was achieved by sharing quantum entangled photons. This solved the problem of excessive hardware devices and optical fibers in existing technologies, and reduced the cost and complexity of network construction.
Patent Information
- Application Number
- CN202511635443.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-10
- Publication Date
- 2026-01-23
AI Technical Summary
Existing quantum teleportation experiments require the deployment of a large number of hardware devices and optical fibers between every two network nodes, resulting in high network construction costs and increased complexity.
A quantum teleportation system was designed. Through a quantum entanglement light source, a wavelength demultiplexing and multiplexing device, and a terminal measurement device, any two network nodes can share a single wavelength of quantum entangled photons. This reduces the deployment of hardware equipment and optical fibers. Only one set of entanglement light source and corresponding measurement and unitary transformation devices are needed to realize quantum teleportation between any nodes.
This reduces the number of hardware devices and optical fibers required for networking, lowers network construction costs and complexity, and enables the efficient construction of quantum networks.
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Figure CN121396451A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the field of quantum communication, and particularly relates to a quantum teleportation system and a quantum teleportation method based on the quantum teleportation system. BACKGROUND
[0002] Quantum teleportation is a technical process of using quantum entanglement characteristics to "teleport" the state of a quantum system (such as the quantum state of a quantum bit) to another quantum system through joint quantum measurement, classical information transmission and quantum gate operation. The core is to completely transfer the information of the original quantum state to the target location without actually moving the quantum system itself, to realize the "teleportation" of the quantum state, which is one of the basic technologies for realizing quantum communication and quantum computing network interconnection in the field of quantum information.
[0003] The current quantum teleportation experiment can only realize point-to-point quantum teleportation, and the construction of a quantum teleportation network requires deploying a set of entangled light sources and corresponding measurement and unitary transformation devices between each two network nodes, which requires O (N^2) level of hardware devices, where N is the number of network nodes, resulting in the need to deploy a large number of hardware devices and optical fibers when constructing a quantum network, which not only increases the network construction cost, but also increases the network construction complexity. SUMMARY
[0004] The purpose of the embodiments of the present application is to provide a quantum teleportation system and a quantum teleportation method based on the quantum teleportation system, which can solve the problem of the need to deploy a large number of hardware devices and optical fibers when constructing a quantum network, which not only increases the network construction cost, but also increases the network construction complexity.
[0005] In order to solve the above technical problems, the present application is implemented as follows: In a first aspect, the embodiments of the present application provide a quantum teleportation system, which comprises: a quantum entangled light source for generating quantum entangled photons and sending the quantum entangled photons to a wavelength demultiplexing and multiplexing device; a wavelength demultiplexing and multiplexing device for wavelength demultiplexing the quantum entangled photons to obtain a plurality of pairs of quantum entangled photons, and sending each pair of quantum entangled photons to a plurality of terminal measurement devices through wavelength division multiplexing; any target terminal measurement device in each terminal measurement device for preparing a target single-photon polarization state to be transmitted, combining with an obtained target quantum entangled photon to generate a response result, and sending the response result to a peer terminal measurement device; the peer terminal measurement device and the target terminal measurement device share a pair of quantum entangled photons, and the pair of quantum entangled photons have the same wavelength as the target quantum entangled photon. The terminal measurement device is configured to obtain the response result, and update a current single-photon polarization state to the target single-photon polarization state based on the response result.
[0006] In one or more embodiments, the quantum entangled light source comprises: A laser is configured to emit laser light. A Sagnac ring structure comprises a bichromatic polarization beam splitter, a bichromatic half-wave plate, a periodically poled potassium titanyl phosphate crystal, and a mirror, and is configured to generate a spontaneous parametric down-conversion process to generate pairs of quantum entangled photons with symmetric wavelengths.
[0007] In one or more embodiments, the terminal measurement device comprises: An optical switch is configured to switch quantum entangled photons with different wavelengths to the Bell state measurement device or the polarization projection measurement device. The Bell state measurement device is configured to prepare a single-photon polarization state to be transmitted when the optical switch is switched to the Bell state measurement device, and combine the target quantum entangled photon obtained to generate a response result. The polarization projection measurement device is configured to obtain a response result when the optical switch is switched to the polarization projection measurement device, and update a current single-photon polarization state of the polarization projection measurement device using the response result.
[0008] In one or more embodiments, the Bell state measurement device comprises: A single-photon polarization state preparation device is configured to prepare a target single-photon polarization state to be transmitted. A Bell state projection device is configured to obtain the target single-photon polarization state and a target quantum entangled photon, and combine the target single-photon polarization state and the target quantum entangled photon to generate a response result.
[0009] In one or more embodiments, the single-photon polarization state preparation device comprises: A quantum entangled light source is configured to generate quantum entangled photons, and send the quantum entangled photons to a wavelength division module. The wavelength division module is configured to divide the quantum entangled photons by wavelength to obtain pairs of entangled photons with different wavelengths, send one entangled photon in each pair of entangled photons to a wavelength switching module, and send the other entangled photon in each pair of entangled photons to a corresponding single-photon detector. The wavelength switching module is configured to select an entangled photon with a certain wavelength from the entangled photons with different wavelengths to send to a polarization modulation module. The polarization modulation module is configured to prepare a single-photon polarization state to be transmitted, and send the single-photon polarization state to the Bell state projection device.
[0010] In one or more embodiments, the Bell state projection device comprises a beam splitter, a plurality of polarization beam splitters connected with the beam splitter respectively, and a single photon detector connected with each polarization beam splitter respectively.
[0011] In one or more embodiments, the polarization projection measurement device comprises a unitary transformation module, a polarization beam splitter connected with the unitary transformation module, and a plurality of single photon detectors connected with the polarization beam splitter.
[0012] In a second aspect, the embodiments of the present application provide a quantum teleportation method based on a quantum teleportation system, and the method comprises the following steps: The target terminal measurement device prepares a target single photon polarization state to be transmitted, and combines the target single photon polarization state with a target quantum entangled photon to generate a response result. The target terminal measurement device sends the response result to a peer terminal measurement device; the peer terminal measurement device and the target terminal measurement device share a quantum entangled photon pair, and the quantum entangled photon pair has the same wavelength as the target quantum entangled photon. The peer terminal measurement device acquires the response result, and updates a current single photon polarization state to the target single photon polarization state based on the response result.
[0013] In one or more embodiments, the target terminal measurement device prepares a target single photon polarization state to be transmitted, and combines the target single photon polarization state with a target quantum entangled photon to generate a response result, which comprises the following steps: A single photon polarization state preparation device in the target terminal measurement device is used to prepare a target single photon polarization state to be transmitted. A Bell state projection device in the target terminal measurement device is used to acquire the target single photon polarization state and the target quantum entangled photon, and combine the target single photon polarization state with the target quantum entangled photon to generate a response result.
[0014] In one or more embodiments, the target terminal measurement device acquires the response result, and updates a current single photon polarization state to the target single photon polarization state based on the response result, which comprises the following steps: When the response result is a preset result, a unitary transformation module in the peer terminal measurement device is put into a polarization and phase modulation device, so that the current single photon polarization state of the peer terminal measurement device is updated to the target single photon polarization state through the polarization and phase modulation device.
[0015] In the embodiment of the present application, a set of quantum teleportation system is designed, including a quantum entangled light source, a wavelength demultiplexing and multiplexing device, and a plurality of network nodes each corresponding to a terminal measurement device. Since the quantum entangled photons of any two network nodes can share a wavelength, after one of the network nodes determines the single-photon polarization state to be transmitted, the network node at the other end can prepare the same single-photon polarization state through the shared quantum entangled photons and single-photon polarization state, so that in the entire quantum network, quantum teleportation can be performed between any two network nodes through a set of entangled light source and corresponding measurement and unitary transformation device, without deploying a set of entangled light source and corresponding measurement and unitary transformation device between each two network nodes, solving the problem that the current quantum teleportation experiment can only perform point-to-point quantum teleportation, reducing the number of optical fiber hardware devices in networking, saving network construction cost, and reducing the complexity of networking. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 is a schematic diagram of the architecture of the quantum teleportation system of the embodiment of the present application; Figure 2 is a structural schematic diagram of the single-photon polarization state preparation device of the embodiment of the present application; Figure 3 is a structure of the unitary transformation module of the embodiment of the present application; Figure 4 is a step flowchart of the quantum teleportation method based on the quantum teleportation system of the embodiment of the present application. DETAILED DESCRIPTION
[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0018] The terms "first", "second", and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in a "or" relationship.
[0019] REFERENCE Figure 1Fig. 1 shows an architecture schematic diagram of a quantum teleportation system according to an embodiment of the present application, wherein three terminal measurement devices are deployed. In actual applications, the specific number of terminal measurement devices can be adjusted according to actual requirements. The present application takes three terminal measurement devices as an example for detailed description.
[0020] Specifically, the system comprises: a quantum entangled light source configured to generate quantum entangled photons and send the quantum entangled photons to a wavelength demultiplexing and multiplexing device; the wavelength demultiplexing and multiplexing device is configured to perform wavelength division demultiplexing on the quantum entangled photons to obtain a plurality of pairs of quantum entangled photons, and perform wavelength division multiplexing to send each pair of quantum entangled photons to a plurality of terminal measurement devices; any target terminal measurement device of the plurality of terminal measurement devices is configured to prepare a target single-photon polarization state to be transmitted, combine the target quantum entangled photon obtained and the target single-photon polarization state to generate a response result, and send the response result to a peer terminal measurement device; the peer terminal measurement device and the target terminal measurement device share one pair of quantum entangled photons, and the pair of quantum entangled photons has the same wavelength as the target quantum entangled photon; the peer terminal measurement device is configured to obtain the response result and update a current single-photon polarization state to the target single-photon polarization state based on the response result.
[0021] In the present application, the quantum entangled light source comprises: a laser LD configured to emit laser light; a Sagnac ring structure comprising a bichromatic polarization beam splitter DPBS, a bichromatic half-wave plate DHWP, a periodically poled potassium titanyl phosphate (PPKTP) crystal, and a mirror, the Sagnac ring structure being configured to generate a spontaneous parametric down-conversion process (SPDC) to generate a plurality of pairs of quantum entangled photons with symmetric wavelengths.
[0022] For example, for the laser , wherein and are corresponding photon wavelengths. According to the law of conservation of energy, the two wavelengths of a pair of entangled photons are symmetrically distributed around a center wavelength. For example, if the center wavelength is 1550.12 nm, then entangled photons with wavelengths of 1550.92 nm (C33) and 1549.32 nm (C35) can be generated, as well as entangled photons of C32 and C36, and C31 and C37.
[0023] Then the entangled photons of each wavelength are input into the wavelength demultiplexing and multiplexing device, the wavelength demultiplexing module in which inputs the entangled photons of different wavelengths into different transmission optical fibers, and then after routing distribution, enters the wavelength multiplexing module to be combined into the same optical fiber for transmission. For example, C31 and C32, C33 and C36, C35 and C37 are combined respectively and transmitted to the terminal measurement device of three network nodes through a single optical fiber. Since the above entanglement pairing relationship, each network node shares a pair of entangled photons with the other two network nodes. That is, the terminal measurement device 1 is sent the entangled photon pair C31 and C32, the terminal measurement device 1 shares a pair of entangled photons C31 and C37 with the terminal measurement device 3, and the terminal measurement device 1 shares a pair of entangled photons C32 and C36 with the terminal measurement device 2; the terminal measurement device 2 is sent the entangled photon pair C33 and C36, the terminal measurement device 2 shares a pair of entangled photons C33 and C35 with the terminal measurement device 3, and the terminal measurement device 2 shares a pair of entangled photons C36 and C32 with the terminal measurement device 1; the terminal measurement device 3 is sent the entangled photon pair C35 and C37, the terminal measurement device 3 shares a pair of entangled photons C37 and C31 with the terminal measurement device 1, and the terminal measurement device 3 shares a pair of entangled photons C35 and C33 with the terminal measurement device 2.
[0024] Further, the quantum entangled light source can also be provided with a fiber collimator, so that the entangled photons of each wavelength can be input into the wavelength demultiplexing and multiplexing device through the fiber collimator.
[0025] In the embodiment of the present application, the terminal measurement device comprises: The optical switch is configured to switch the quantum entangled photons of different wavelengths to the Bell state measurement device or the polarization projection measurement device. The Bell state measurement device is configured to, when the optical switch is switched to the Bell state measurement device, prepare a single-photon polarization state to be transmitted, and combine the prepared single-photon polarization state with the obtained target quantum entangled photon to generate a response result. The polarization projection measurement device is configured to, when the optical switch is switched to the polarization projection measurement device, obtain the response result, and update the current single-photon polarization state of the polarization projection measurement device using the response result.
[0026] That is, two paths can be deployed in the terminal measurement device, one path inputting the Bell state measurement device and the other path inputting the polarization projection measurement device. When the optical switch is switched to the Bell state measurement device, a single-photon polarization state to be transmitted is prepared, and the prepared single-photon polarization state is combined with the obtained entangled photon to generate a response result. When the optical switch is switched to the polarization projection measurement device, the response result is obtained, and the current single-photon polarization state of the polarization projection measurement device is updated using the response result.
[0027] It should be noted that, since the optical switch is selected from the Bell state measurement device and the polarization projection measurement device, the terminal measurement device for generating the response result is not the same as the terminal measurement device for obtaining the response result, that is, the terminal measurement device for generating the response result is the sender for performing quantum teleportation, and the terminal measurement device for obtaining the response result is the receiver for performing quantum teleportation.
[0028] Further, the target quantum entangled photons can be input into the Bell state projection device through the optical switch. That is, the Bell state projection device can obtain the target quantum entangled photons from the optical switch, and obtain the target single-photon polarization state to be transmitted from the single-photon polarization state preparation device.
[0029] Further, one optical fiber collimator can be arranged on each of the two paths, so that the quantum entangled photons passing through the optical switch can be input into the Bell state measurement device or the polarization projection measurement device through the optical fiber collimator.
[0030] In the embodiment of the present application, the Bell state measurement device comprises: The single-photon polarization state preparation device is configured to prepare the target single-photon polarization state to be transmitted. The Bell state projection device is configured to obtain the target single-photon polarization state and the target quantum entangled photons, and combine the target single-photon polarization state with the target quantum entangled photons to generate a response result.
[0031] Since Figure 1 Four single-photon detectors are shown in FIG. 4, and the response result is described taking the four single-photon detectors as an example. In actual application, the four single-photon detectors do not respond at the same time, but respond in two, and the specific response result can be shown in the following table:
[0032] Among them, D1&D3 means that the single-photon detector D1 and the single-photon detector D3 respond at the same time, and the like.
[0033] In the embodiment of the present application, the single-photon polarization state preparation device comprises: The quantum entangled light source is configured to generate quantum entangled photons, and send the quantum entangled photons to the wavelength division module; The wavelength division module is configured to perform wavelength division on the quantum entangled photons according to wavelengths to obtain entangled photon pairs of different wavelengths, send one entangled photon in each entangled photon pair to the wavelength switching module, and send the other entangled photon in each entangled photon pair to the corresponding single-photon detector; The wavelength switching module is configured to select an entangled photon of a certain wavelength from the entangled photons of different wavelengths and send the entangled photon to the polarization modulation module; The polarization modulation module is configured to prepare a single-photon polarization state to be transmitted and send the single-photon polarization state to the Bell state projection device.
[0034] Referring to Figure 2 , a structure diagram of a single-photon polarization state preparation device is shown. In the preparation device, the quantum entangled light source is the same as the quantum entangled light source in the system. For example, after the quantum entangled light source generates quantum entangled photons, the quantum entangled photons are input to a wave division device, and the wave division device performs wave division to obtain C31 and C37, C32 and C36, C31 and C37 being a quantum entangled photon pair and C32 and C36 being a quantum entangled photon pair. Then, C31 and C32 are input to a wavelength switching module, and C36 and C37 are input to single-photon detectors, respectively. The detection results of the single-photon detectors are used to predict the occurrence of the quantum entangled photons of C31 and C32.
[0035] In the wavelength switching module, an optical switch can be arranged to select one quantum entangled photon from the two quantum entangled photons and input the selected quantum entangled photon to the polarization modulation module. The polarization modulation module prepares a single-photon polarization state to be transmitted according to the input quantum entangled photon and sends the single-photon polarization state to the Bell state projection device.
[0036] In the embodiment of the present application, the Bell state projection device includes a beam splitter, a plurality of polarization beam splitters connected to the beam splitter, respectively, and a single-photon detector connected to each polarization beam splitter, respectively.
[0037] In the embodiment of the present application, the polarization projection measurement device includes a unitary transformation module, a polarization beam splitter connected to the unitary transformation module, and a plurality of single-photon detectors connected to the polarization beam splitter.
[0038] Specifically, a polarization and phase modulation device, such as a half-wave plate with a rotation angle of 0 degrees, can be arranged in the unitary transformation module. Referring to Figure 3 , a structure of the unitary transformation module is shown. When the unitary transformation module is in a certain preset state, the half-wave plate can be placed in the optical path; when the unitary transformation module is in another preset state, the half-wave plate can be removed from the optical path, that is, no operation is performed on the input quantum state. In this way, when the half-wave plate is placed in the optical path, the input quantum state can be changed, so that the single-photon polarization state of the target terminal measurement device is obtained by the opposite terminal measurement device, and the quantum teleportation between the opposite terminal measurement device and the target terminal measurement device is realized.
[0039] In the application embodiment, a set of quantum teleportation system is designed, including a quantum entangled light source, a wavelength demultiplexing and multiplexing device, and a plurality of network node corresponding terminal measurement devices. Since quantum entangled photons of a wavelength can be shared between any two network nodes, after one network node determines the single photon polarization state to be transmitted, the network node at the other end can prepare the same single photon polarization state through the shared quantum entangled photons and the single photon polarization state, so that in the entire quantum network, quantum teleportation can be performed between any two network nodes through a set of entangled light source and corresponding measurement and unitary transformation device, without deploying a set of entangled light source and corresponding measurement and unitary transformation device between each two network nodes, solving the problem that the current quantum teleportation experiment can only perform point-to-point quantum teleportation, reducing the number of optical fiber hardware devices in networking, saving network construction cost, and reducing the complexity of networking.
[0040] Referring to Figure 4 , a step flow chart of a quantum teleportation method based on a quantum teleportation system is shown, and the method comprises: Step 401, the target terminal measurement device prepares a target single photon polarization state to be transmitted, and combines the target quantum entangled photon obtained to generate a response result.
[0041] Step 402, the target terminal measurement device sends the response result to the opposite terminal measurement device; the opposite terminal measurement device shares a quantum entangled photon pair with the target terminal measurement device, and the quantum entangled photon pair has the same wavelength as the target quantum entangled photon.
[0042] Step 403, the opposite terminal measurement device obtains the response result, and updates the current single photon polarization state to the target single photon polarization state based on the response result.
[0043] Specifically, in the quantum network, after a user determines a terminal measurement device (denoted as “opposite terminal measurement device”) that needs to perform quantum teleportation in the terminal measurement device (denoted as “target terminal measurement device”) of any network node, the target terminal measurement device can prepare a single photon polarization state to be transmitted (denoted as “target single photon polarization state”), and obtain a quantum entangled photon (denoted as “target quantum entangled photon”) input from an optical switch, then combine the target single photon polarization state with the target quantum entangled photon to generate a response result, and send the response result to the opposite terminal measurement device.
[0044] Since the opposite end terminal measurement device shares one quantum entangled photon pair with the target terminal measurement device, and the quantum entangled photon pair has the same wavelength as the target quantum entangled photon, the opposite end terminal measurement device can update the current single photon polarization state to the target single photon polarization state by using the response result after obtaining the response result.
[0045] In the embodiment of the present application, the target terminal measurement device prepares a target single photon polarization state to be transmitted, and combines the target quantum entangled photon to generate a response result, comprising: The single photon polarization state preparation device in the target terminal measurement device is used to prepare a target single photon polarization state to be transmitted; The Bell state projection device in the target terminal measurement device is used to obtain the target single photon polarization state and the target quantum entangled photon, and combine the target single photon polarization state with the target quantum entangled photon to generate a response result.
[0046] In the embodiment of the present application, the target single photon polarization state is updated based on the response result, comprising: When the response result is a preset result, a polarization and phase modulation device is put into the unitary transformation module in the opposite end terminal measurement device, so that the current single photon polarization state of the opposite end terminal measurement device is updated to the target single photon polarization state through the polarization and phase modulation device.
[0047] For the convenience of understanding, the embodiment of the present application takes Figure 1 as an example for illustration.
[0048] The user A selects the opposite end user B to be performed quantum teleportation through the terminal measurement device 1, and switches the optical switch in the terminal measurement device 1 to the Bell state measurement device, and the user B switches the optical switch in the terminal measurement device 2 to the polarization projection measurement device.
[0049] The user A prepares a single photon polarization state to be transmitted based on the single photon polarization state preparation device (quantum entangled light source, wavelength division module, wavelength switching module (switching wavelength C31 or C32) and polarization modulation module) in the terminal measurement device 1 , and inputs the Bell state projection device together with the entangled photon of C32 wavelength transmitted through the optical switch , to obtain the quantum state (response result) as follows:
[0050] After arrangement, we get:
[0051] Among them,
[0052]
[0053]
[0054]
[0055] The Bell state projection device will generate a response based on the projection results from the four single-photon detectors (D1~D4):
[0056] Here, D1&D3 means that single-photon detector D1 and single-photon detector D3 respond simultaneously, and so on.
[0057] Terminal measurement device 1 transmits the detector's response result to terminal measurement device 2 via classical communication. When the response result is... At that time, the terminal measurement device 2 adjusts its unitary transformation module to state I, that is, no polarization and phase modulation devices are placed in the optical path, and no operation is performed on the input quantum state; when the response result is At that time, the terminal measuring device 2 adjusts its unitary transformation module to... In this state, a half-wave plate (polarization and phase modulation device) with a rotation angle of 0 degrees is placed in the optical path.
[0058] After the above-described process, the quantum state of the terminal measuring device 2 becomes That is, the terminal measuring device 2 obtains the single-photon polarization state prepared by the terminal measuring device 1, and at this time the entire quantum teleportation process between the terminal measuring device 2 and the terminal measuring device 1 has been completed.
[0059] In the application embodiment, a quantum teleportation system was designed, including a quantum entangled light source, a wavelength demultiplexing and multiplexing device, and terminal measurement devices corresponding to multiple network nodes. Since any two network nodes can share a single wavelength of quantum entangled photon, after one network node determines the polarization state of the single photon to be transmitted, the other network node can prepare the same single photon polarization state using the shared quantum entangled photon and the single photon polarization state. Thus, in the entire quantum network, quantum teleportation between any two network nodes can be achieved through a single entangled light source and corresponding measurement and unitary transformation device, without the need to deploy a single entangled light source and corresponding measurement and unitary transformation device between every two network nodes. This solves the problem that current quantum teleportation experiments can only perform point-to-point quantum teleportation, reduces the number of optical fibers in the network hardware, saves network construction costs, and reduces network complexity.
[0060] It should be noted that, in the present document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without further constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element. Furthermore, it is to be understood that the method and apparatus of the present embodiments can be carried out by more than one process, method, article, or apparatus either simultaneously, concurrently, or in reverse order. In other words, the steps described herein can be carried out in any order as would be appreciated by those skilled in the art, such as carrying out the described methods in a different order, removing, or adding steps, or combining steps, and the like. In addition, features described in relation to one example can be combined in a combination of examples.
[0061] From the above description of the embodiments, it is clear that the above-described method of the embodiments can be realized by means of software and a general-purpose hardware platform as necessary, and of course, can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such an understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as a ROM / RAM, a magnetic disk, or an optical disk) and includes a number of instructions for causing a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in the various embodiments of the present application.
[0062] The embodiments of the present application are described above in conjunction with the drawings, but the present application is not limited to the above-described specific embodiments, and the above-described specific embodiments are merely illustrative, rather than limiting, and those of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims.
Claims
1. A quantum teleportation system, characterized in that, The system comprises: a quantum entangled light source for generating quantum entangled photons and sending the quantum entangled photons to a wavelength demultiplexing and multiplexing device; the wavelength demultiplexing and multiplexing device is used for wavelength division demultiplexing the quantum entangled photons to obtain a plurality of quantum entangled photon pairs, and sending each quantum entangled photon pair to a plurality of terminal measurement devices through wavelength division multiplexing; any target terminal measurement device in each terminal measurement device is used for preparing a target single-photon polarization state to be transmitted, combining the target quantum entangled photon obtained, generating a response result, and sending the response result to a counter terminal measurement device; the counter terminal measurement device and the target terminal measurement device share a quantum entangled photon pair, and the quantum entangled photon pair has the same wavelength as the target quantum entangled photon; the counter terminal measurement device is used for obtaining the response result and updating a current single-photon polarization state to the target single-photon polarization state based on the response result.
2. The quantum teleportation system of claim 1, wherein, The quantum entangled light source comprises: a laser for emitting laser light; a Sagnac ring structure comprising a bichromatic polarization beam splitter, a bichromatic half-wave plate, a periodically poled potassium titanyl phosphate crystal, and a mirror, for generating a spontaneous parametric down-conversion process to produce a plurality of pairs of wavelength-symmetric quantum entangled photons.
3. The quantum teleportation system of claim 1, wherein, The terminal measurement device comprises: an optical switch for switching quantum entangled photons of different wavelengths to a Bell state measurement device or a polarization projection measurement device; the Bell state measurement device is used for preparing a single-photon polarization state to be transmitted when the optical switch is switched to the Bell state measurement device, combining the target quantum entangled photon obtained, and generating a response result; the polarization projection measurement device is used for obtaining a response result when the optical switch is switched to the polarization projection measurement device, and updating a current single-photon polarization state of the polarization projection measurement device using the response result.
4. The quantum teleportation system of claim 3, wherein, The Bell state measurement device comprises: a single-photon polarization state preparation device for preparing a target single-photon polarization state to be transmitted; a Bell state projection device for obtaining the target single-photon polarization state and a target quantum entangled photon, and combining the target single-photon polarization state with the target quantum entangled photon to generate a response result.
5. The quantum teleportation system of claim 4, wherein, The single-photon polarization state preparation device comprises: a quantum entangled light source for generating quantum entangled photons and sending the quantum entangled photons to a wavelength division module; the wavelength division module is used for wavelength division of the quantum entangled photons according to wavelengths to obtain entangled photon pairs of different wavelengths, sending one entangled photon of each entangled photon pair to a wavelength switching module, and sending the other entangled photon of each entangled photon pair to a corresponding single-photon detector; the wavelength switching module is used for selecting an entangled photon of a certain wavelength from the entangled photons of different wavelengths to send to a polarization modulation module; the polarization modulation module is used for preparing a single-photon polarization state to be transmitted and sending the single-photon polarization state to the Bell state projection device.
6. The quantum teleportation system of claim 4, wherein, The Bell state projection device comprises a beam splitter, a plurality of polarization beam splitters connected with the beam splitter respectively, and a single photon detector connected with each polarization beam splitter respectively.
7. The quantum teleportation system of claim 3, wherein, The polarization projection measurement device comprises an unitary transformation module, a polarization beam splitter connected with the unitary transformation module, and a plurality of single photon detectors connected with the polarization beam splitter.
8. A quantum teleportation method based on a quantum teleportation system, characterized in that, Comprise: The target terminal measurement device prepares a target single photon polarization state to be transmitted, and combines the target quantum entangled photon obtained to generate a response result; The target terminal measurement device sends the response result to the opposite terminal measurement device; the opposite terminal measurement device and the target terminal measurement device share a pair of quantum entangled photons, and the wavelength of the pair of quantum entangled photons is the same as that of the target quantum entangled photon; The opposite terminal measurement device obtains the response result, and updates the current single photon polarization state to the target single photon polarization state based on the response result.
9. The quantum teleportation method of claim 8, wherein, The target terminal measurement device prepares a target single photon polarization state to be transmitted, and combines the target quantum entangled photon obtained to generate a response result, comprising: The target terminal measurement device prepares a target single photon polarization state to be transmitted, and combines the target quantum entangled photon obtained to generate a response result, comprising: The target terminal measurement device prepares a target single photon polarization state to be transmitted, and combines the target quantum entangled photon obtained to generate a response result, comprising:
10. The quantum teleportation method of claim 8, wherein, The target terminal measurement device prepares a target single photon polarization state to be transmitted, and combines the target quantum entangled photon obtained to generate a response result, comprising: The target terminal measurement device prepares a target single photon polarization state to be transmitted, and combines the target quantum entangled photon obtained to generate a response result, comprising: The target terminal measurement device prepares a target single photon polarization state to be transmitted, and combines the target quantum entangled photon obtained to generate a response result, comprising: When the response result is a preset result, the unitary transformation module in the opposite terminal measurement device puts in a polarization and phase modulation device, so that the current single photon polarization state of the opposite terminal measurement device is updated to the target single photon polarization state through the polarization and phase modulation device.