68 results about "Quantum channel" patented technology

The present technology pertains to systems and methods for one-way authentication of quantum channels. A transmitter generates an entangled quantum state comprising a first state and a second state, modulates the second state according to a clock-synchronized pattern, and transmits it through a quantum channel to a receiver. The first state is retained and measured at the transmitter to extract quantum-state information. Authentication is performed based on this information, without requiring feedback from the receiver. The quantum-state information may be derived using quadrature measurements, Gaussian tomography, or other statistical analyses to detect whether the second state underwent irreversible interactions such as eavesdropping or decoherence. The system enables secure unidirectional quantum authentication, reduces protocol complexity, and supports real-time anomaly detection. It is compatible with continuous-variable quantum states, quantum key distribution (QKD), and scalable communication architectures.

The classical channel employs a transmit laser and classical modulator. The quantum channel employs a nonlinear medium and spontaneous parametric down conversion producing quantum entangled signal and idler photon pairs which are encoded. The classical and quantum channels are combined to define a propagated hybrid signal. The receiver splits the hybrid signal on basis of wavelength into classical and quantum channels. The quantum receiver employs optical parametric amplification, supplied with energy from a second harmonic generation device synchronized to the classical carrier wavelength. A photodetector and extracts a quantum message from the quantum signal.

The invention relates to quantum key distribution, in particular to a quantum key distribution system and method based on end-to-end loss control and enhanced Alice, and is characterized in that on the basis of traditional Alice, an OTDR (Optical Time Domain Reflectometer) transmitting unit and a transmission measurement transmitting unit are integrated; according to the enhanced Bob, on the basis of a traditional Bob, an OTDR receiving unit and a transmission measurement receiving unit are integrated; the data processing and control unit is used for generating an OTDR reflectogram and a loss tomogram, calculating a total effective leakage value, optimizing signal strength and privacy amplification parameters according to the latest effective leakage value, performing information coordination and privacy amplification, continuously performing channel fingerprint authentication and safely terminating when abnormity occurs under the cooperation of the enhanced Alice and the enhanced Bob; the inherent physical structure of the optical fiber quantum channel serves as a physical unclonable function; according to the invention, the defect of sharp contradiction among the key rate, the transmission distance and the actual security can be overcome.

The invention relates to the technical field of quantum security computing communication, and discloses a cluster state-based third-party quantum summation method with a bidirectional identity authentication mechanism, which comprises the following steps of: firstly, realizing bidirectional identity authentication between a participant and a third party in a quantum channel by pre-sharing secret identity information and a hash function in combination with a decoy photon technology; and impersonation and man-in-the-middle attack are fundamentally eradicated. And after the authentication is passed, the participant randomly executes measurement or reflection operation on the particle to which the participant belongs, so that an encrypted private key can be generated under the assistance of a third party, and external eavesdropping and internal participant attack can be jointly detected according to an operation combination to form multi-level security protection. Finally, the third party can only calculate the bitwise modular binary sum of the private bit string of each party, and cannot obtain any single input value. According to the method, authentication and calculation are organically fused, unconditional security is guaranteed, and meanwhile, the quantum capability requirements of participants are remarkably reduced.

1. The name of the design product: the graphical user interface of the programmable quantum channel switching system of electronic equipment. 2. The use of the design product: an electronic device. 3. The design points of the design product: the graphical user interface. 4. The picture or photo that best indicates the design points: design 1 front view. 5. Design 1 is designated as the basic design. 6. The use of the graphical user interface: for the software running and data state display and setting of the programmable quantum channel switching system. 7. The human-computer interaction mode of the graphical user interface: design 1 front view is the software main interface, and in design 1 front view, "channel information definition" is clicked to enter design 1 interface change state diagram; design 2 front view is the software main interface, and in design 2 front view, "channel switching configuration" is clicked to enter design 2 interface change state diagram.

One object of the invention is a method for distributing a secret key via a quantum channel using a satellite (and an associated architecture) in which the distribution planning is performed in real time by the satellite itself and by the ground quantum communication stations, without the intervention of a mission control center external to the stations. The satellite is autonomous and manages its own resources. In this architecture, the satellite autonomously and independently acquires the information necessary for mission planning from the ground mission control center. [Fig. 3B]

Method for distributing pairs of secure secret keys intended to secure communications between a first communication station (S1) and a second communication station (S2), said method comprising the following steps: exchanging, via a quantum channel (CQ1) linking a satellite (Sat) to said first communication station (S1), a first secret key; exchanging, via a quantum channel (CQ2) linking said satellite (Sat) to said second communication station (S2), a second secret key; receiving, in said satellite, a communication request between the first and second communication stations issued by said first or second communication station, referred to as the transmitting station; encrypting, in said satellite, the first secret key (by a symmetric encryption method which uses the second secret key (,in order to generate a first encrypted message ( ) and transmit said first encrypted message to said second communication station (S2) via an authenticated channel ( , called first authenticated channel. [Fig. 3A],

This invention discloses an integrated quantum key distribution device and method, which serves as both a transmitter and a receiver. As a transmitter, an optical injection locking device generates a group of optical pulses, which, after passing through an optical attenuator, are input to an unequal-arm Mach-Zehnder interferometer to obtain the quantum states of the corresponding basis vectors, and then input to a quantum channel. As a receiver, quantum states are received from the quantum channel. For Z-based quantum states, the output is sent to a third single-photon detector for decoding after passing through an optical beamsplitter; for X-based or Y-based quantum states, the output is sent to the unequal-arm Mach-Zehnder interferometer after passing through an optical beamsplitter, and then to a first and second single-photon detector for decoding. This invention eliminates the need for external modulation, enabling quantum state preparation and measurement within a single device using only one interferometer. This reduces the complexity of the quantum key distribution system, improves its compactness, and facilitates practical application.

The invention relates to the technical field of information security and block chains, in particular to a quantum encryption and block chain-based cross-border agricultural product digital lading system, which comprises a quantum state sensing and key generation module for calculating a key life cycle according to a quantum channel bit error rate and a network transmission rate which are acquired in real time, a bit stream is extracted from a local quantum random number pool in the secret key life cycle to generate a one-time session secret key and a corresponding secret key identifier; and the dynamic encryption processing module is used for receiving the one-time session key and performing symmetric encryption operation on the agricultural product lading bill data by using the one-time session key so as to generate a lading bill ciphertext. According to the invention, through quantum state dynamic key making and ciphertext anchoring separation verification, a secure closed loop from a physical layer to an application layer is realized, so that the problem that a traditional system mostly adopts static encryption and cannot resist quantum computing power attack, so that long-term confidential faces backtracking cracking is solved.

A semantically secure identification and communication method based on classical quantum channels comprises the following steps: constructing a classical quantum channel, selecting the input signal distribution and dividing the codeword, constructing an encoder, joint decoding, verification and identification, reliability analysis, and information leakage analysis. This invention divides the communication codeword into a main block and an auxiliary block. The main block uses an output statistical approximation of the transmission codebook, making it impossible for eavesdroppers to distinguish the communication signal from background noise. The auxiliary block uses a hash function for random mapping, preventing eavesdroppers from extracting valid information, thus achieving semantic security. Mapping the identification message to a combination of seed and hash value reduces the probability of confusion between different identification messages, improves identification accuracy, and provides a coding basis for analyzing false alarms, missed alarms, and information leakage. This invention has advantages such as strong confidentiality, strong concealment, high identification accuracy, and the ability to achieve identification communication while satisfying semantically secure requirements. It can be used for classical quantum secure communication.

This invention belongs to the field of quantum dialogue and discloses a one-step quantum dialogue method. In this method, communicator A prepares a large number of identical polarization-spatial hyperentangled states and sends one photon from each hyperentangled state to communicator B through a quantum channel, establishing a hyperentangled quantum channel between the two parties. After confirming the security of the photon transmission process, both parties encode the photon pairs according to the information to be transmitted. Then, by running nonlocal Bell state measurements and publishing the detector responses, both parties can read the information transmitted by the other, thus achieving bidirectional quantum communication, i.e., quantum dialogue. Compared with existing quantum dialogue protocols, this invention reduces the number of photon transmissions in the channel from two to one, simplifying experimental operations and effectively reducing the photon loss rate, which can effectively promote the practical application of quantum dialogue.

A quantum key distributed (QKD) apparatus for use with at least two endpoint devices, the apparatus including QKD links each having a communication medium with a quantum channel and a classical channel, wherein each endpoint has a QKD link connected to the QKD apparatus; transmitters to transmit quantum transmissions over a quantum channel of one of the QKD links; a classical transceiver component to transmit / receive classical data over a classical channel of one of the QKD links; and a controller to route data for quantum transmission to an endpoint via a transmitter assigned to the endpoint over a quantum channel of the QKD link of the endpoint, route classical data to an endpoint via a classical transceiver assigned to the endpoint over a classical channel of the QKD link of the endpoint, and route classical data over the classical channel of the QKD link of an endpoint.

A modular quantum data processing system includes at least: a first quantum data module, a second quantum data module, a quantum gate module, a quantum circuit router, a quantum channel module, a classical channel module, and a classical processing module. The quantum channel module includes a plurality of quantum channels, and the classical channel module includes a plurality of quantum channels.

The invention discloses a quantum key distribution network dynamic optimization method and system, a terminal and a storage medium. The method comprises the following steps: obtaining quantum channel state information in a quantum network; constructing a graph neural network dynamic model, and inputting the quantum channel state information into the graph neural network dynamic model to obtain link selection probabilities corresponding to a plurality of links; determining a key injection instruction according to the plurality of link selection probabilities; and generating an execution result according to the key injection instruction. According to the method, real-time optimization under channel jitter can be realized, and the key distribution efficiency is improved, so that the key rate can be improved, and the system efficiency is improved.

The application relates to a quantum perception intelligent key distribution method for an intelligent quantum communication network, which comprises the following steps: inputting quantum channel original observation data into a computer system and extracting a quantum feature vector at each step; stacking the quantum feature vector into a two-dimensional matrix and performing space-time representation through a convolutional neural network; combining a bidirectional long short-term memory network and an attention mechanism to obtain time sequence cleaning features; extracting associated quantum channel features and noise statistics, performing abnormality detection and error correction prediction; inputting both into a proximal policy optimization algorithm to adjust transmission distance and protocol parameters; combining the adjusted parameters to construct a saturated noise channel model, correcting errors, amplifying privacy, and generating a final secure key. The application aims to fully combine quantum feature perception, deep sequence modeling and reinforcement learning optimization mechanism, construct high-dimensional quantum feature mapping, and perform standardization, filtering and abnormal value processing, so that robust feature extraction of quantum channel original observation is realized.

This invention discloses a quantum key distribution system based on an OTN network, comprising: several nodes, each node being communicatively connected to at least one other node via optical fiber; a sending node encrypting the service data to be transmitted using a quantum key, and the encrypted service data being transmitted to a target node via a corresponding optical fiber; upon receiving the encrypted service data, the target node decrypts the encrypted service data by reading a symmetric quantum key from a key pool. By applying QKD technology to the OTN network, which is based on quantum physical properties such as measurement collapse theory, uncertainty principle, and no-cloning principle, and encrypts service data using a quantum key, it offers the advantage of information theoretical security; simultaneously, by dynamically adapting optical switches to service channels, it eliminates the waste of hardware resources caused by deploying multiple additional quantum channels, balancing security and transmission performance. This technology is suitable for quantum-secure networking scenarios with multiple nodes and concurrent services in OTN networks, such as finance, government affairs, and healthcare.

The present disclosure provides a method for carrying out user authentication in a quantum communication system. More specifically, the method comprises the steps of: on the basis of a pre-shared key, generating authentication quantum information by encoding an authentication message for user authentication, wherein a basis, for encoding each bit element constituting the authentication message, the respective bit elements corresponding to the respective positions of bit elements constituting the pre-shared key, is determined on the basis of respective bit values of the bit elements constituting the pre-shared key; transmitting the authentication quantum information to a receiving end via a quantum channel; receiving, from the receiving end, authentication quantum information measurement information related to a value derived by means of the receiving end measuring the authentication quantum information; and carrying out user authentication with the receiving end on the basis of the authentication quantum information measurement information.

A CV-QKD system comprising a plurality of transmitters, one or more splitters, and a plurality of receivers is provided. Each transmitter modulates a quantum signal according to a discrete or continuous distribution in phase and amplitude. Each splitter distributes N modulated quantum signals, received from a respective transmitter or from another splitter, into M modulated quantum sub-signals. Each receiver is configured to: receive, via a respective quantum channel, a modulated quantum sub-signal associated to one or more of the transmitters from the one or more splitters; detect one or more quadrature components of the received modulated quantum sub-signal; and perform a respective post-processing protocol with one or more of the plurality of transmitters to generate one or more individual final secret keys between the one or more transmitters and the receiver and / or one or more common secret keys between the one or more transmitters and the plurality of receivers.

Various aspects of phase error estimation in a quantum communication system are provided. In some aspects, a semiclassical quantum fourier transform (SQFT) may be applied to incoming quantum states. Measurements results from the SQFT may be used to estimate a phase error. Various SQFT circuitry is further described, including parallel SQFT circuitry and sequential SQFT circuitry.

The invention discloses a port Internet of Things secure communication system based on quantum key distribution, and the system comprises quantum key distribution equipment which is used for generating and distributing quantum keys; the Internet of Things devices are distributed in all areas of the port and used for collecting and transmitting port operation related data; the control center is used for managing and controlling the whole system; and the communication network comprises a quantum channel and a classic channel, the quantum channel is used for transmitting the quantum key, and the classic channel is used for transmitting the encrypted data and control information. By combining the quantum key distribution technology with the port Internet of Things, a high-security and high-reliability solution is provided for port Internet of Things communication, and strict requirements of ports on communication security under ever-increasing service requirements are met.

This invention discloses a high-precision positioning method and system based on the collaborative operation of a smart badge and an RTK positioning base station, relating to the field of RTK positioning technology. It includes the following steps: S1: Constructing a quantum key distribution network using the set RTK base stations, establishing and optimizing the spatiotemporal correlation matrix between the RTK base stations; S2: Obtaining the encrypted differential data stream of the RTK base stations using the smart badge, and simultaneously obtaining the predicted spatiotemporal drift error of the RTK base stations based on the spatiotemporal correlation matrix and an LSTM network, and determining the optimal base station through a DQN network; S3: Determining the Mahalanobis distance using the original pseudorange observations and original carrier phase observations, and filtering the base station data to obtain the position correction amount of the base station. This not only adaptively switches between quantum channel and UWB positioning modes based on signal strength, but also achieves seamless indoor and outdoor positioning with centimeter-level accuracy, solving the problems of accuracy drops caused by base station switching and multi-source data fusion deviations.

The invention discloses a communication method based on a quantum communication system. And under the condition that both the identity authentication of the sending terminal and the identity authentication of the receiving terminal pass, the sending terminal sends a communication application to the first ground base station, and the communication application is used for establishing quantum encryption communication with the receiving terminal. Then, under the condition that the classical communication channel between the sending terminal and the receiving terminal is established, the first ground base station generates a quantum key application request based on the communication application, and sends the quantum key application request to a quantum satellite; then, the quantum satellite generates a first quantum symmetric key based on the quantum key application request. And finally, based on the quantum key application request, the quantum satellite sends a first quantum key in the first quantum symmetric keys to the first ground base station, and sends a second quantum key in the first quantum symmetric keys to the second ground base station, so as to perform quantum encryption communication. Therefore, the quantum channel can be prevented from being occupied by a large amount of communication data, and the quantum resource utilization efficiency is improved.

The invention relates to the technical field of quantum security calculation, and discloses a multi-party multi-data summation method based on a d-dimensional cluster state, which introduces a semi-honest third party to assist in completing summation calculation, and constructs a bidirectional identity authentication process between a participant and the third party by using a dual one-way hash function, thereby effectively preventing identity impersonation attack. In a multi-party multi-data summation stage, a multi-party quantum information interaction structure is established by using quantum entanglement association between a d-dimensional Bell state and a d-dimensional cluster state, and secure coding and aggregation of private data of participants are realized through Bell measurement. Meanwhile, detection particles from (d + 1) groups of complementary bases are randomly inserted into a quantum channel and are used for detecting potential eavesdropping behaviors and ensuring the safety of a quantum communication process.

There is disclosed a system for providing an EPR quantum channel, comprising: a transmitter of entangled photons, the transmitter comprising a source configured to generate entangled photon pairs, a first receiver and a second receiver, the first receiver and the second receiver each comprising: a unit for storing quantum bits, the unit is arranged to store quantum bits carried by the received photons; -a photonic switch arranged to send the received photons to the storage unit; -a photon pass-through detector configured to control the photonic switch and to record the time at which a photon is received; the invention relates to a device for receiving photons, comprising a plurality of receivers, an information processor arranged to control the photon switches of said receivers, a communication system connecting the two receivers to each other, said communication system being arranged to communicate the time at which the photons are received to determine an entangled photon pair, the two photons of which have each arrived at the receiver to which it is transmitted.

The invention relates to a quantum key distribution and anti-quantum signature secure fusion method, which comprises the following steps: two communication parties initialize a system and establish a communication channel, establish a data channel for transmitting public information, and complete physical synchronization of a quantum channel for transmitting quantum states, and the two communication parties distribute the quantum states through the quantum channel, a shared quantum key is obtained on a data channel through basis vector comparison, information coordination and privacy amplification, two communication parties obtain a session working key for data encryption through a key derivation function based on the shared quantum key, a sender encrypts plaintext data by using the session working key and a symmetric encryption algorithm, and the encrypted plaintext data is transmitted to a server. And S105, the ciphertext is transmitted to a receiver through a data channel, the receiver carries out decryption by using the same session working key, and according to a preset strategy, S103 to S105 are repeatedly executed to update the session working key and carry out secure erasure on an invalid old key.

The invention discloses an AI-based frequency bin coding measurement equipment-independent quantum key distribution method. The method comprises the following steps executed by a computer system: inputting quantum signals sent by two communication parties, a relative radial speed between a communication node and an infeasible relay node and historical quantum interference statistical characteristic data; the method comprises the steps of quantum channel observation and frequency bin quantum state construction, frequency bin dynamic evolution caused by relative motion, frequency compensation decision based on reinforcement learning, influence of residual frequency errors on quantum interference performance, frequency bin utilization rate and error code propagation caused by interference degradation and safe key rate generation. The adaptive capacity and the operation reliability of the MDI-QKD system based on the frequency bin in a dynamic and multi-noise environment can be effectively improved, and an intelligent solution is provided for safe key distribution in a high-capacity quantum communication network.

The present disclosure is for performing an arbitrator-based quantum signature by using a single photon without using a direct connection channel between a transmitter and a receiver in a communication system. The method performed by a first device may comprise the steps of: performing an initial access procedure with a base station; establishing a connection with the base station; transmitting capability information to the base station; establishing a quantum channel with a third device for a quantum signature with a second device; and transmitting, to the third device through the quantum channel, request information including at least one quantum state message encrypted by using a secret symmetric key that is shared between the first device and the third device, as information for requesting generation of signature information for the quantum signature.

The invention discloses a quantum key distribution parameter optimization method in a space-frequency multiplexing common-fiber transmission system. The method is suitable for a quantum key distribution light-emitting network of space-frequency multiplexing common-fiber transmission. The invention provides a quantum key distribution parameter optimization method based on a coordinate descent method, which mainly considers the problem that the quantum key distribution performance of fixed parameter setting is reduced due to channel parameter changes such as background noise and channel attenuation of a quantum channel in a space-frequency multiplexing common-fiber transmission system. The method aims at optimizing quantum key distribution parameters in real time according to channel parameters and improving quantum channel performance. Technical support is provided for fusion transmission of quantum key distribution and a classic optical network, and the application process of quantum key distribution is promoted.

The invention discloses a self-adaptive wireless energy and signal simultaneous transmission device integrated with a QC feedback loop, which relates to the technical field of wireless energy and signal simultaneous transmission and comprises a transmitting end, a receiving end and a wireless channel. The transmitting end comprises an energy information fusion signal generator, a multi-mode transmitting coil array, a quantum channel state decoder and a cognitive adaptive controller. According to the method, channel state parameters are mapped to quantum states of entangled photons through quantum entanglement pair sources of a quantized feedback signal generator, and instantaneous correlation transmission of channel state information is achieved through feedback signals by means of quantum entanglement characteristics. A transmitting end does not need to completely deadjust feedback data packets, the channel state can be rapidly obtained through quantum state comparison, the delay bottleneck of traditional analog and digital feedback links is thoroughly broken through, and a system can capture channel microscopic changes in time.

The invention relates to the technical field of quantum communication, and discloses a communication data leakage defense method and system based on quantum computing, and the method comprises the steps: carrying out the quantum state coding of communication data, and obtaining a quantum encryption data flow; injecting a quantum probe state into the quantum channel, and performing Bell-based measurement on the quantum probe state to obtain quantum entanglement fidelity; mapping the quantum entanglement fidelity to a quantum state phase space, and performing quantum parallel estimation on a quantum channel to obtain a leakage risk probability amplitude; performing quantum state chromatography on the quantum encrypted data stream, and identifying a specific quantum bit highly associated with a leakage event; performing quantum measurement collapse on the specific quantum bit to obtain an invalid quantum bit state; performing quantum state repair on the quantum encrypted data stream to obtain a reconstructed quantum ciphertext stream, and transmitting the reconstructed quantum ciphertext stream to a target node to realize anti-leakage transmission of communication data; according to the invention, the efficiency of communication data leakage defense based on quantum computing can be improved.