24 results about "Quantum teleportation" patented technology

A control system for a network of quantum systems operates the network to perform quantum informatics processing. The control system includes an entanglement scheduler configured to identify operations for which entanglement of two or more of the quantum systems is desired, identify plural potential entanglement attempts for generating the entanglement; and schedule at least some of the potential entanglement attempts to be performed to generate the entanglement for at least one of the operations. The entanglement scheduler may use direct entanglement, entanglement swapping and / or quantum teleportation approaches to generate the entanglement. The entanglement scheduler may schedule probabilistic entanglement attempts based at least in part on the probability of success of the entanglement attempts. The entanglement scheduler may generate entanglement to support plural branches of a quantum informatics process and / or to respond to events occurring while the quantum informatics process is executing.

Quantum teleportation is essential for many quantum information technologies, including long-distance quantum networks. Using fiber-coupled devices, including state-of-the-art low-noise superconducting nanowire single-photon detectors and off-the-shelf optics, we achieve conditional quantum teleportation of time-bin qubits at the telecommunication wavelength of 1536.5 nm. We measure teleportation fidelities of ≥90% that are consistent with an analytical model of our system, which includes realistic imperfections. To demonstrate the compatibility of our setup with deployed quantum networks, we teleport qubits over 22 km of single-mode fiber while transmitting qubits over an additional 22 km of fiber. Our systems, which are compatible with emerging solid-state quantum devices, provide a realistic foundation for a high-fidelity quantum Internet with practical devices.

The invention discloses an electric power system quantum electromagnetic transient simulation method with a high quantum state utilization rate. The electric power system quantum electromagnetic transient simulation method comprises the following steps: S1, solving an electric quantity of an electric power system through quantum calculation; s2, transmission of action information of a control switch in a single simulation step length and quantum state transmission of a step length are realized through quantum stealth transmission; s3, through a multi-path parallel step length simulation quantum state providing method, parallel calculation is carried out to sequentially provide simulation quantum states with the difference of one step length; s4, constructing a quantum analysis circuit to extract electrical quantity characteristic information of the key node according to a stride length simulation quantum state in the time window; and S5, realizing long-time-consumption quantum computing task error suppression based on quantum teleportation by adopting a segmented quantum computing relay architecture. According to the method, the problem of low quantum electromagnetic transient simulation calculation efficiency caused by low quantum state utilization rate is solved aiming at the phenomenon of reading out a multi-step quantum state after quantum-classical information interaction and simulation in calculation.

The application discloses a kind of machine room equipment intelligent remote operation and maintenance method and platform, it is related to intelligent operation and maintenance technical field, including, construct bayesian probability model, and combine optical signal characteristics and current harmonic characteristics, predict the failure probability distribution of machine room equipment;According to the failure probability distribution of machine room equipment, convert fault coordinates into equipment logical identifier, and detect the quantum teleportation link of machine room equipment, generate machine room equipment switching instruction according to detection result;According to machine room equipment switching instruction, send Bell state measurement command to fault equipment, and carry out quantum state reconstruction and machine room equipment switching.The application constructs multilayer bayesian probability model based on Gaussian distribution, Granger causality test and variational inference, realizes the nonlinear correlation analysis of optical signal wavelength shift and current harmonic characteristics, can accurately capture the weak signs of potential equipment failure, to significantly improve the sensitivity and reliability of failure prediction.

The invention provides a controlled bidirectional remote transmission method of any quantum state, and relates to the technical field of quantum communication. According to the invention, a control party David and communication parties Alice, Bob and Candy are introduced to construct a cooperative communication system, and the three communication parties all have receiving and transmitting bidirectional functions, so that the limitation of traditional one-way transmission is broken. Two core communication paradigms of quantum invisible transmission and remote state preparation are creatively fused, a maximum entanglement state sharing mechanism is constructed between a communication party and a control party, and bidirectional interactive transmission of quantum information is realized under cooperative regulation and control of the control party: Alice can invisibly transmit any single-bit state and two-bit state to Bob and Candy respectively, and Alice can invisibly transmit any single-bit state and two-bit state to Bob and Candy respectively; at the same time, Bob and Candy can also be used for jointly and remotely preparing any two bit states for Alice. In a transmission process, a receiver can perfectly reconstruct a target quantum state through a series of quantum measurement and unitary transformation operations, so that deterministic bidirectional hybrid transmission of quantum information is achieved. According to the technical scheme, organic fusion of two quantum communication modes is achieved, a multi-node collaborative quantum information interaction architecture is constructed, a core technology foundation is laid for constructing an efficient and flexible quantum communication network, and the application potential of quantum information transmission is remarkably improved.

The invention discloses a microwave continuous variable quantum teleportation method, which comprises the following steps that: a third party adopts a Josephh parametric amplifier and a microwave beam splitter to generate a dual-mode compression state in a set low-temperature environment, and sends the dual-mode compression state to a communication sender and a communication receiver; after receiving the signal, the communication sender performs Bell measurement to generate a feed-forward signal, and sends the feed-forward signal to the communication receiver; and the communication receiver processes the signal sent by the third party according to the received feedforward signal to obtain the quantum state sent by the communication sender, and microwave continuous variable quantum teleportation is completed. The invention also discloses a system for realizing the microwave continuous variable quantum teleportation method. Through the innovative design of the continuous variable quantum teleportation scheme and the innovative signal processing mode, microwave continuous variable quantum teleportation is achieved, reliability is better, and accuracy is better.

A modular quantum computing system that enables distributed quantum computation across multiple quantum processing units (QPUs) that are remotely connected using a quantum entanglement network is disclosed. In order to execute a quantum circuit across multiple QPUs, any quantum state pertaining to any given multi-qubit gate of the quantum circuit may be teleported between two respective QPUs, such that an overall quantum compute capacity for executing the quantum circuit is expanded. Based on a number of QPUs that are allocated for executing the quantum circuit, buffers of established, pairwise quantum entanglement instances between respective sets of the allocated QPUs may be prepared and subsequently maintained prior to and during execution of the quantum circuit, in order to limit potential latency due to use of a quantum entanglement network within the execution of a given quantum circuit.

The invention discloses an experimental device for simulating quantum entangled state measurement and quantum teleportation by using a classical light source, which comprises the following steps: after a first light beam is emitted by an entangled light source simulation module through a laser light source, carrying out polarization and beam splitting treatment to generate two polarized light paths for simulating spatially separated entangled photon pairs; a second light beam is emitted by a laser light source through a simulated unknown quantum state generation module and then is subjected to polarization and beam splitting processing, two second polarized light beams which are used for simulating generation of unknown quantum states and are orthogonal in polarization direction and equal in intensity are generated, and polarized light beams output by an Alice end, a Bob end and a Cindy end are measured respectively. The light intensity data of the polarized light beam under a plurality of preset measurement bases are measured, the light intensity data are converted into coincidence counts in combination with a preset counting rule, the light path configuration of quantum entangled state measurement and quantum teleportation is determined according to the coincidence counts, and the experimental device has good stability and repeatability.

A method performed by Charlie in a quantum communication system, according to one embodiment of the present disclosure, may comprise the steps of: forming a first Bell-state resource between a first qubit and a qubit included in Alice; forming a second Bell-state resource between a second qubit and a qubit included in Bob; transforming, into a first Greenberger-Horne-Zeilinger (GHZ) state, a three-qubit state from among the second qubit, a third qubit, and the qubit included in Bob; performing a Bell-state measurement between the first qubit and the second qubit; transforming, on the basis of the Bell-state measurement performing result, a three-qubit state from among the third qubit, the qubit included in Alice, and the qubit included in Bob into a second GHZ state, and performing entanglement teleportation by using the second GHZ state as a resource.

The invention discloses a quantum teleportation system and a quantum teleportation method based on the quantum teleportation system, and belongs to the field of quantum communication.The quantum teleportation system comprises the steps that a quantum entanglement light source generates quantum entanglement photons and sends the quantum entanglement photons to a wavelength demultiplexing and multiplexing device; the wavelength demultiplexing and multiplexing device performs wavelength demultiplexing on the quantum entangled photons to obtain a plurality of quantum entangled photon pairs, and sends the quantum entangled photon pairs to the plurality of terminal measurement devices through wavelength division multiplexing; any target terminal measurement device prepares a target single photon polarization state to be transmitted, combines the target single photon polarization state with the obtained target quantum entanglement photons to generate a response result, and sends the response result to the opposite terminal measurement device; and the opposite-end terminal measuring device obtains a response result, and updates the current single-photon polarization state to the target single-photon polarization state based on the response result. According to the invention, the problem that quantum teleportation can only be carried out in a point-to-point manner in a current quantum teleportation experiment is solved.

The application discloses a kind of quantum teleportation methods based on atom-photon entanglement: step 1: Alice and Bob prepare the atom sequence of different initial state.Step 2: Alice generates reference light pulse and signal light pulse, and is transmitted in channel by time division multiplexing.Step 3: Alice manipulates signal light pulse and atom interaction to produce entangled state, and after transmission by quantum channel, coherent light and the atom of Bob establish entanglement, to complete three-particle entanglement.Step 4: Alice divides atom sequence, and Bob carries out channel security detection.Step 5: after channel security, Alice encodes secret information on information sequence atom and publishes measurement result.Step 6: Alice does Hadamard gate operation to the atom sequence carrying information.Step 7: Bob demodulates secret information.The application makes full use of long decoherence time atom-photon entanglement resources, meets the communication demand of high channel capacity and high link efficiency, and provides a feasible way for constructing large-scale, loss-resistant quantum internet.

The invention belongs to the technical field of quantum information science, and particularly relates to a duplex quantum teleportation device. The system comprises a first user node, a second user node and a server node, the user node is provided with a quantum information sending module and a quantum information receiving module, the quantum information sending module is used for quantum information, and the quantum information receiving module recovers a transmitted quantum state according to a Bell state measurement result. The server node receives quantum information sent by the user node and performs Bell state measurement, records and sends each Bell state measurement event to the user node, and distributes signal photons corresponding to idle frequency photons to the user node; and the user node correspondingly transforms the received signal photons according to the Bell state measurement result to obtain the quantum state sent by the opposite party, thereby realizing duplex quantum teleportation. According to the invention, quantum stealth transmission in two directions can be realized at the same time under the condition of not increasing extra quantum channels.

This invention relates to quantum teleportation, specifically to a quantum teleportation system and method based on two-photon polarization-path entanglement, comprising a polarization entanglement source, an Alice end, and a Bob end; the polarization entanglement source is used to generate a pair of polarization-entangled photons; the Alice end receives the first polarization-entangled photon from the pair and performs initial path-transfer state preparation and polarization-path joint Bell state detection on it; the Bob end receives the second polarization-entangled photon from the pair and performs unitary operation and single-photon state tomography on it to reconstruct the transferred quantum state; the technical solution provided by this invention can effectively overcome the shortcomings of existing technologies, such as complex optical paths, high implementation costs, and limited application scope.

The application discloses a kind of method for realizing distributed quantum amplitude amplification and related equipment, method includes: the initial success probability of quantum state is quantified based on target unitary operator, and configuration unitary operator is obtained from target unitary operator based on division parameter;Based on division parameter, Boolean function is split into the subfunction of preset quantity and sequentially distributed to each quantum node;Based on configuration unitary operator, the probability upper limit value of each quantum node is quantified using amplitude estimation;According to probability upper limit value, iteration number is obtained, and according to initial success probability, iteration upper limit is obtained;Based on iteration number, the measurement string corresponding to quantum node is iteratively output by quantum amplitude amplification algorithm, and then target string is verified and determined;Quantum operation result is obtained by summarizing the target string corresponding to all quantum nodes.The application can effectively avoid the dependence of existing distributed quantum computation on quantum communication means such as quantum teleportation, and can be widely applied in the field of data processing.

The invention discloses an anti-attack financial transaction clearing system and method based on a quantum teleportation network, relates to the technical field of quantum communication and information security, and aims to solve the problems of key security risk, single-point failure and disjunction of instruction authorization and execution environment in the prior art. The instruction generation node is used for generating a target financial transaction instruction. The environment sensing node is used for generating a first dynamic authorization signal according to a real-time network attack situation, and performing joint measurement on the target financial transaction instruction by using the first dynamic authorization signal; the identity authentication node is used for generating a second dynamic authorization signal according to a real-time identity authentication result; using the second dynamic authorization signal to carry out combined measurement on the target financial transaction instruction; and the instruction execution node is used for executing a target financial transaction instruction when the target financial transaction instruction is received.

In some aspects, the techniques described herein relate to a method including: providing, from a first endpoint, an unentangled photon containing image information to an intermediate server via a first multimode fiber; generating, at a second endpoint, an entangled photon pair including a first entangled photon and a second entangled photon; providing, from the second endpoint, the first entangled photon to the intermediate server via a second multimode fiber; Bell state measuring the unentangled photon and the first entangled photon at the intermediate server to swap entanglement of the first entangled photon such that the unentangled photon becomes entangled with the second entangled photon; providing, from the intermediate server to the second endpoint, results of the Bell state measuring; and generating an image corresponding to the image information at the second endpoint using the second entangled photon and the results of the Bell state measuring.

The invention relates to a quantum information interconnection system based on a hollow-core optical fiber channel, and belongs to the technical field of quantum information science. By utilizing the characteristics of low loss, low dispersion, good stability and the like of the hollow-core optical fiber, which are different from those of a solid-core optical fiber, the hollow-core optical fiber is introduced into a quantum invisible state transmission system to serve as a quantum channel, so that low-delay, high-fidelity and stable transmission of a quantum state between nodes is realized. The quantum interconnection system method and device based on the hollow-core optical fiber quantum teleportation have the advantages of being low in time delay and high in fidelity, have robustness to environment disturbance such as temperature, and effectively ensure long-term stable operation of quantum information transmission. The quantum invisible state transmission device designed through the method uses commercial components, can be widely applied to the fields of long-distance large-scale quantum networks, distributed quantum computing and the like, and is beneficial for promoting practical development of the frontier communication technical field and the quantum technical field.

A system for detecting an environmental condition at or adjacent a measurement location on an aircraft comprises a quantum sensor system configured to sense one or more physical parameters at the measurement location and to encode the sensed one or more physical parameters as one or more quantum states for quantum teleportation. It further comprises a processing system configured to receive the one or more quantum states from the quantum sensor system using quantum teleportation, and process the one or more quantum states to detect the environmental condition at or adjacent the measurement location.

This invention discloses a quantum circuit segmentation method and system based on a two-layer algorithm. The method employs a two-layer optimization architecture: the outer layer constructs an algorithm framework based on a genetic algorithm, using the qubit sequence as chromosomes, dividing it into fixed segments according to hardware capacity constraints, generating an initial population, and performing genetic operations; the inner layer constructs an algorithm framework based on a greedy algorithm, simulating the quantum circuit execution process through a dual-priority decision rule, calculating the minimum number of quantum teleportations and the fitness value required for the segmentation scheme. The inner and outer layers iterate collaboratively until the termination condition is met, outputting the optimal quantum circuit segmentation and quantum teleportation scheme. This invention achieves global search through the outer layer genetic algorithm and precise evaluation through the inner layer greedy algorithm, effectively avoiding local optima defects and significantly reducing the number of quantum teleportations while satisfying hardware capacity constraints.

This invention discloses a continuous-variable quantum teleportation method for propagating microwaves indoors, comprising the following steps: S1: At the sender's side, a two-mode squeezed state TMS is generated in a low-temperature environment using a Josephus parametric amplifier (JPA) and a microwave beam splitter, wherein the low-temperature environment refers to an absolute zero operating condition; and a state of the TMS is transferred to free space and transmitted to the receiver via a microwave transmitting antenna; S2: The sender measures the input state and a state of the TMS it possesses, generates a feedforward signal, and sends it to the receiver; S3: The receiver uses the received feedforward signal and the TMS state to obtain the input state to be transmitted, completing the quantum teleportation. This enables quantum communication in a real-world environment.

The application discloses a quantum teleportation communication security enhancement method and system based on a Turbo code, aiming at a classical Rayleigh channel, error correction is carried out by using a classical Turbo code, so that the measurement result can be reliably transmitted from a transmitting end to a receiving end, and the QBER and BER of the system are significantly improved. Under the condition of a quantum depolarization channel, the influence of classical channel errors and quantum channel errors on the QBER is analyzed in depth, transmission of pre-shared entangled quantum bits is protected by using a quantum error correction Shor code, and finally, a safe and reliable teleportation protocol is obtained by using a QSDC scheme and verifying entangled quantum bit pairs by a trusted third party, so that the quantum communication demand in various application scenarios can be met.

Systems and techniques for active quantum memory (AQM) and quantum circuits with feedback are described. For instance, one or more aspects of the present disclosure may enable the indefinite storage of one or more qubits via a sequence of quantum teleportations or quantum swaps involving the rapid periodic executions of a standard teleportation or swap protocols with feedback (e.g., provided the total feedback cycle time is less than the decoherence time for a qubit). The stored quantum state may be passed repeatedly back-and-forth between two of the qubits, and the stored quantum state may be maintained by the input energy on each cycle required to initialize the entangled qubit pair (e.g., where the cycle period is chosen to be less than the decoherence time of the qubits to maintain state information over many cycles).

The invention discloses a measurement equipment irrelevant entanglement witness method based on a decoy state light source, and the method comprises the steps: obtaining a preset number of weak coherent pulse light sources with preset intensity prepared by a first local verification party and a second local verification party, and carrying out the coding, and obtaining a corresponding quantum state; performing non-destructive measurement based on quantum teleportation on all the quantum states to obtain a single photon state, and performing Bell state measurement on the single photon state and the to-be-verified particle to obtain a measurement result; obtaining the gain of the target detector according to the measurement result, and calculating the upper bound and the lower bound of the single photon response probability; and decomposing a pre-selected witness operator to all the quantum states to obtain a witness operator irrelevant to the measurement equipment, calculating an entanglement criterion to obtain an entanglement criterion calculation result, and verifying whether the particle to be verified has entanglement according to the entanglement criterion calculation result. According to the invention, the entanglement state in the to-be-verified particle can be accurately discriminated.

This application discloses a quantum message authentication method and apparatus based on quantum teleportation, relating to the fields of quantum communication and information security. It includes: a transmitter distributing a second particle from an entangled particle pair to a receiver, while retaining the first particle; generating multiple sets of classical authentication information based on the original message and predetermined authentication rules; encoding each set of authentication information onto the quantum state of an auxiliary particle; performing a Bell kinematic measurement on the encoded auxiliary particle and its corresponding first particle, outputting the classical measurement result; and sending the measurement result to the receiver, enabling the receiver to obtain the original message. The receiver, using its held second particle, the received classical measurement result, and the original message, reconstructs the authentication information generated by the transmitter and verifies the original message according to the authentication rules. This application combines quantum teleportation with classical authentication rules, transmitting critical authentication information through a physically secure quantum channel, effectively resisting quantum computing attacks and man-in-the-middle attacks.