105 results about "Quantum memory" patented technology

The invention discloses a switch secure communication encryption method based on quantum key distribution. The method comprises the following steps: a service party submits a'security-delay-bandwidth 'intention to a zero-trust brain through a quantum policy intention description language; evaluating the real-time quality, key margin and topology accessibility of an optical fiber quantum channel, a classical ultra-high-speed channel and a radio frequency space channel according to intention requirements; triggering a QKD transmitting end and a receiving end to perform quantum state transmission of polarization and OAM coding along the optimal quantum path, completing basis vector comparison, error code verification and privacy amplification, generating a root quantum key, and injecting the root quantum key into an on-chip quantum memory; when a data packet arrives at a switch port, the assembly line takes out Kroot from the first-level key pool, and derives a one-time session key through the HMAC-SHA3; continuously monitoring a quantum channel bit error rate, a key pool margin and an AI abnormal score; and the transmitting and receiving parties synchronously confirm and destroy the session key, write all key life cycle events into a quantum invariant account book, and realize second-level auditing evidence obtaining through block chain hash anchoring.

The present disclosure relates to a quantum communication system. Particularly, the present disclosure relates to a device and a method for performing two-step quantum secure direct communication (QSDC) with a reduced complexity without measuring a quantum memory and a bell state of a receiver in a quantum communication system.

According to an embodiment of the present invention, a system may include a quantum memory module, a magic state preparation module, and a quantum computation module. The quantum computation module is coupled to either the quantum memory module or the quantum magic state preparation module using an 1-coupler. This may enable optimization of the hardware to more efficiently perform quantum computations. According to another embodiment of the present invention, a modular system may include a plurality of quantum systems, where the quantum systems are connected using 1-couplers according to a tree diagram. This may enable optimization of the hardware to more efficiently perform quantum computations.

A system for optimizing business decision-making through the integration of quantum computing, machine learning, and artificial intelligence, consisting of: a quantum computing unit comprising a quantum processing unit (QPU) and a quantum memory configured to execute quantum techniques on large business datasets, with the quantum computing unit handling complex optimization tasks such as supply chain management, resource allocation, and financial portfolio optimization; a computing unit that is operationally coupled to the quantum computing unit, wherein the computing unit is configured to execute machine learning (ML) techniques and artificial intelligence (AI) models, and wherein the computing unit performs decision support tasks by analyzing quantum-generated results and applying AI-driven predictive analyses; a data interface unit that enables bidirectional communication between the quantum computing unit and the processing unit, thus allowing seamless data exchange for hybrid computing; and a decision output unit configured to present actionable business decisions based on results from quantum optimization and AI-assisted analysis.

A quantum memory device 100 for storing a signal field 170 comprises an optical cavity comprising a first and second reflective surface 110, 120, a first and a second optical element 130,140 within th

A quantum error correcting code with dynamically generated logical qubits is provided. When viewed as a subsystem code, the code has no logical qubits. Nevertheless, the measurement patterns generate logical qubits, allowing the code to act as a fault-tolerant quantum memory. Each measurement can be a two-qubit Pauli measurement.

Technologies for resource-efficient quantum error correction are disclosed. A quantum computer may include physical gate qubits, capable of general quantum gate operations such as single-qubit operations and nearest-neighbor two-qubit operations. Each physical qubit gate may be controllably coupled to a quantum memory. The quantum memory may have a lower per-gate error rate than the physical qubit gates as well as a lower per-qubit cost. Because errors accrue at a lower rate in the quantum memory, the physical gate qubits may be able to perform error correction for a large number of logical qubits in the quantum memory, even if the physical gate qubits have an error rate relatively close to an error threshold.

Provided herein are systems and methods for implementing a field-deployable quantum memory. The quantum memory device includes a device housing configured to be rack-mounted and a quantum memory module disposed within the device housing and configured to perform a memory operation including storing an input qubit and retrieving the stored qubit for output. The quantum memory device may also include a filter module disposed within the device housing and configured to filter an output of the quantum memory module.

A quantum interconnect module includes a quantum memory that has a dual arm interferometer embedded therein. The dual arm interferometer has a first arm within a crystal and a second arm within the crystal. The interferometer is coupled to a photon source. A microwave resonator has a waveguide coupled to a microwave source. The microwave resonator is coupled to the first arm of the quantum memory. The interferometer generates an output based on the microwave source.

The invention discloses an electronic archive online circulation transmission method and system based on a quantum technology, and relates to the technical field of electronic archives, and the method comprises the steps: obtaining a to-be-transmitted electronic archive, and generating a quantum key for encryption transmission through a quantum key distribution technology; performing quantum encryption processing on the electronic archive by using the quantum key to form encrypted archive data containing quantum state information; and carrying out online transmission on the encrypted archive data through a quantum communication channel, and carrying out decryption and restoration by a receiving end by using a corresponding quantum key to complete the safe circulation of the archive. According to the invention, secure storage is realized through the quantum memory, key distribution security is ensured by using a BB84 protocol, encryption strength is improved by using quantum state superposition operation, and high-fidelity transmission is realized through quantum communication carriers and a multiple error correction mechanism.

Systems and methods are disclosed for making a quantum network node. A plurality of scoring function F values are calculated for an array of at least two photonic crystal cavity unit cells, each having a lattice constant α and a hole having a length Hx and a width Hy. A value of α, a value of Hx, and a value of Hy are selected for which a scoring function value is at a maximum. A waveguide region and the array of at least two photonic crystal cavity unit cells based on the selected values are formed on a substrate. At least one ion between a first photonic crystal cavity unit cell and a second photonic crystal cavity unit cell are implanted and annealed into a quantum defect. A coplanar microwave waveguide is formed on the substrate in proximity to the array of at least two photonic crystal cavity unit cells.

A method of entangling photons in a distributed quantum-based communication system is disclosed which includes generating sets of entangled photon pairs between a plurality of remote nodes (Nodes Ai and Nodes Bi) and a central entangling node (Node C), wherein Nodes Ai and Bi are in both quantum communication and classical communication with Node C, wherein one photon of a first entangled photon pair set is transmitted Node Ai and one photon of a second entangled photon pair set is transmitted to Node Bi, each over the associated quantum channels, and performing Bell-state measurements between the other photon of the first entangled photon pair and the other photon of the second entangled photon pair, such that if the photons arrive at about same time having about same frequency, then the photon pairs are marked as being entangled.

A method for routing in a quantum network is provided. The method may include receiving parameters including a fidelity with coherence decay time and an entanglement generation rate for each quantum node in a mesh quantum network by a controller, the controller being configured to communicate with each quantum node of a plurality of quantum nodes in the mesh quantum network. Each quantum node includes a quantum memory and a processor. The method may also include analyzing the fidelity with coherence decay time and the entanglement generation rate to yield a determination of a path fidelity with a path coherence decay time and a path entanglement generation rate between at least one pair of quantum nodes. The method may further include, based on the determination, selecting a quantum communication path from a source node to a destination node.

A system includes a quantum memory configured to store sensitive data to be transmitted to a quantum computing device over an optical communication channel and a quantum processor operably coupled to the quantum memory and configured to generate pairs of entangled quantum bits (QuBits), and further encode each pair of the pairs of entangled QuBits based on the sensitive data. The pairs of entangled QuBits include the sensitive data. The quantum processor is further configured to store the pairs of entangled QuBits to a predetermined quantum storage medium configured to maintain a state of each pair of the pairs of entangled QuBits, identify, based on a change in state associated with one Qubit of a pair of the pairs of entangled QuBits, an unauthorized measurement of the pairs of entangled QuBits, and in response to identifying the unauthorized measurement, cause the pairs of entangled QuBits to be rendered unreadable.

The invention provides an apparatus for quantum communication in a quantum network configured to create an entangled pair of quantum information carriers comprising a first quantum information carrier and a second quantum information carrier, transmit the first quantum information carrier to a remote device, store the second quantum information carrier in a quantum memory, receive, from the remote device, information about a phase correction related to the transmission of the first quantum information carrier, and apply the phase correction to the second quantum information carrier.

The invention provides a quantum state protocol construction system, and relates to the technical field of quantum communication, an Alice end modulates an optical pulse into a quantum optical pulse bearing two mutually orthogonal polarization states, and the quantum optical pulse is sent to a Bob end through an optical fiber link; the Bob end receives the quantum light pulses sent by the Alice end, extracts one light pulse, disorganizes the time sequence of the other light pulses, and returns the light pulses to the Alice end through an optical fiber link; and the Alice end realizes measurement of quantum state information of the light pulse by detecting the returned light pulse, and determines the type of one light pulse extracted by the Bob end. Based on the setting of a quantum multi-party security computing protocol device in quantum communication, the use of immature quantum related equipment such as a quantum memory and a high-dimensional entanglement quantum measurement device at present is avoided, and the application range of the protocol is enlarged.

A system and method are provided for entanglement assisted quantum sensing. An entangled source generates entangle photon pairs that include a signal photon and an idler photon. The signal photon is modulated and transmitted to a target. In the monostatic configuration, the idler photon stays at the radar, where the idler photon passes through a quantum memory or delay line and an optical phase-conjugate module. The radar return signal includes signal photons that have interacted with the target (e.g., reflected from the target). The received signal photons are detected using balanced homodyne detection by beating the received signal photons against the phase-conjugate idler photons, which function as a local oscillator. The target is detected using a cross-correlation between the electrical signal from the homodyne balanced detector and the modulation pattern used to modulate the signal photons.

The present invention relates to a quantum information storage device (100) comprising a vacuum chamber (2), a plurality of waveguides (4) configured to propagate light of wavelength λ, each waveguide (4) having a narrower cross-sectional segment with a minimum lateral dimension less than λ, and an atomic trap configured to trap a single atomic cloud (20) around the narrower cross-sectional segment of the plurality of waveguides.

A quantum memory device for storing a signal field is provided. The quantum memory device comprises an optical cavity comprising a first reflective surface and a second reflective surface; a first optical element and a second optical element arranged within the optical cavity; an atomic system situated between the first optical element and the second optical element, the atomic system configured to store the signal field via an atomic transition; and one or more magnets configured to apply an axial magnetic field across the atomic system.

The invention belongs to the technical field of commercial cipher system testing, and particularly relates to a quantum random number generator-based commercial cipher system entropy source quality detection method, which comprises the following steps of: acquiring shot noise of a light quantum detector at a high sampling rate, removing direct current bias by using a moving average subtraction method, and acquiring a quantum fluctuation sequence of a zero mean value; based on a variance ratio of the sequence and short-range autocorrelation, nonlinear mapping of an exponential function is utilized to obtain correlation degree so as to amplify a weak non-quantum memory effect; obtaining an evaluation model containing hyperbolic cosine and a logarithmic function by combining the drift potential energy of the bias voltage relative to the target value and the aging time of the device, and obtaining a dynamic entropy loss index; and comparing the entropy loss index with a preset threshold value, and executing self-adaptive bias current feedback regulation or triggering hardware fusing according to a comparison result. According to the invention, the problem of recessive degradation of the entropy source caused by drifting of the working point of the detector is solved, and accurate closed-loop control of the quality of the entropy source is realized.

The present invention provides an efficient quantum memory for storing a quantum state of light, such as a photon, for a temporary period of time in a fibre-integrated optical cavity and then recall the quantum state of light and quantum information at a later time with a high probability of success. The present invention uses a nonlinear optical switching mechanism to modify at least one property of the quantum light, or cavity, to trap the quantum light in the optical cavity. Subsequent application of the nonlinear optical switching mechanism switches at least one property of the stored quantum light, or cavity, to release the quantum light from the optical cavity. The present invention also provides quasi-deterministic single-photon generation by temporal multiplexing of a photon pair source integrated within the cavity.

Solution synthesis of rare-earth-doped nanoparticles, followed by flash sintering of the nanoparticles, can produce rare-earth-doped transparent polycrystalline ceramics with beneficial optical and / or mechanical properties, such as low optical losses, high optical coherence, high refractive-index controllability, and / or high mechanical strength. In one example application, high-quality erbium-doped yttria for quantum memory devices can be fabricated.

The present application belongs to the technical field of commercial cipher system test, and particularly relates to a method for detecting the quality of an entropy source of a commercial cipher system based on a quantum random number generator, which comprises: obtaining shot noise of an optical quantum detector at a high sampling rate, removing direct current bias by using sliding average subtraction, and obtaining a quantum fluctuation sequence with zero mean; obtaining a correlation degree by using nonlinear mapping of an exponential function based on the variance ratio and short-range autocorrelation of the sequence, so as to amplify weak non-quantum memory effects; obtaining an evaluation model containing a hyperbolic cosine and a logarithmic function by combining the drift potential of a bias voltage relative to a target value and the aging time of a device, so as to obtain a dynamic entropy loss index; and comparing the entropy loss index with a preset threshold value, and performing adaptive bias current feedback adjustment or triggering hardware fusing according to the comparison result. The present application solves the problem of implicit degradation of an entropy source caused by drift of a detector operating point, and realizes precise closed-loop control of the quality of the entropy source.

A permanent defect qubit repair system using a redundant repair circuit at a quantum circuit level, includes: automatic test equipment configured to provide a fault address table with information of a permanent fault address (FA) and a spare address (SA) for replacing the FA to a quantum memory; a redundant repair circuit configured to constitute a circuit to repair a permanent defect qubit consisting of an address comparison and address replacement process and transfer an updated memory address to an address routing circuit; and the quantum memory comprising the address routing circuit configured to receive the updated memory address from the redundant repair circuit and then route the updated memory address to a memory cell according to an address value.

A quantum memory manager (QMM) of a source endpoint obtains a memory request from a quantum application for quantum memory blocks. The source endpoint negotiates with a destination endpoint to determine a memory lifetime value that includes a minimum decoherence time for qubits stored at the source endpoint and qubits stored at the destination endpoint. The QMM allocates a quantum memory block of a plurality of qubit storage locations to the quantum application based on the memory lifetime value. The QMM receives communication qubits that are entangled with destination qubits sent to the destination endpoint, and stores the communication qubits in the quantum memory block. Each particular communication qubit of the communication qubits is entangled with a particular destination qubit of the destination qubits.

The invention provides a high-performance quantum memory device structure, and belongs to the field of novel magnetic random access memories. According to the invention, a spin heterojunction is constructed and an abnormal Hall effect (AHE) is utilized to change a Hall voltage so as to realize storage of data '0' and '1'. The spin heterojunction is composed of three layers of materials which are respectively a single crystal substrate gadolinium gallium garnet (Gd3Ga5O12, GGG), a Bi-doped rare earth iron garnet film Bi: HoIG and a heavy metal layer Au-doped PtBi alloy Au: PtBi from bottom to top, and the heavy metal layer is of a cross structure. The memory device structure is small in critical flip current, low in power consumption, high in storage speed, simple to prepare, low in manufacturing cost and short in manufacturing period. And the memory device structure has the advantages of non-volatility, good film material quality and excellent performance.

Methods for fabricating optically active quantum memories into quantum-grade diamond thin films and then bonding them to semiconductor substrates are described. Semiconductor substrates are optically and electronically functionalized in preparation for using a flip-chip bonding technique to bond the functionalized substrates to overgrown diamond thin films that host color centers. By purposefully growing quantum-grade diamond thin films and implanting them with color centers separately from fabrication processes that functionalize the substrates, the high quality, purity, and crystallinity of the thin films are preserved, while also allowing for further customization of the types of color centers that are implanted into the diamond.

Local quantum communication networks for general-purpose quantum computing may use millions of physical qubits to encode thousands of logical qubits, presenting a substantial hardware architecture challenge. Our modular Quantum System-on-Chip (QSoC) architecture uses a quantum microchiplet (QMC) that features compact two-dimensional arrays of diamond color centers with a resonant dielectric antenna integrated on a foundry-processed chip. Our QSoC architecture enables full connectivity for quantum memory arrays in a set of different resonant frequencies and offers the possibility of further scaling the solid-state physical qubit number via larger and denser QMC arrays and optical frequency multiplexing networking. Our QSoC architecture can efficiently generate a large scale fully connected qubit state by tuning the emitters' emission frequency. Larger qubit resources can achieve a connected qubit cluster state with less tunabiliy. Our QSoC architecture can be readily extended to other solid-state quantum memory platforms.

Techniques for generating and maintaining a buffer of on-demand, pairwise quantum entanglement instances using programmable optical switchboard architectures within quantum repeaters are disclosed. A rate of establishing pairwise quantum entanglement instances between quantum repeaters of a quantum entanglement network may be higher than both a rate of decay of said instances and a rate of consumption of said instances for providing distributed quantum entanglement, such that on-demand distribution of quantum entanglement may be provided for customers. Furthermore, an optical switchboard with a given quantum repeater may be configured to route between any of the quantum memory locations provided within the quantum repeater, such that an optimization of the usage of such buffers of quantum entanglement instances may be ensured.

The invention provides a design method and device of a quantum memory architecture and a storage medium. The method comprises the following steps: receiving a physical quantum bit specification and an environmental noise model constructed based on environmental noise; selecting a continuous symmetric group according to the interaction between the physical quantum bit specification and the environmental noise; synthesizing a quantum state code in the symmetrically protected subspace through a continuous symmetric group; a control pulse sequence for keeping symmetric protection is designed through a continuous symmetric group; and outputting a quantum memory architecture specification according to the quantum state code and the control pulse sequence, including: in an access stage of the quantum memory, actively and dynamically decoupling the quantum state of the quantum memory from the environmental noise based on the control pulse sequence. On the basis, the quantum memory architecture adopting the continuous symmetric groups to realize symmetric protection can reduce the number of physical quantum bits of the quantum memory and simplify the error correction overhead.