Method and system for intelligent decision-making photonic signal processing, where the system comprises a multi-functional input unit, an electro-optical conversion module, a signal processing module, a photoelectric conversion module, a multi-functional output unit, and an artificial intelligence chip. The invention combines the advantages of photonic high-speed, wide-band, and electronic flexibility, combined with heterogeneous photoelectron hybrid integration, packaging and other processes, along with deep learning algorithm, is an intelligent electronic information system that may simultaneously realize digital and analog signal processing.

Quantum repeater systems and apparatus for quantum communication. In one aspect, a system includes a quantum signal receiver configured to receive a quantum field signal; a quantum signal converter configured to: sample quantum analog signals from a quantum field signal received by the quantum signal receiver; encode sampled quantum analog signals as corresponding digital quantum information in one or more qudits, comprising applying a hybrid analog-digital encoding operation to each quantum analog signal and a qudit in an initial state; decode digital quantum information stored in the one or more qudits as a recovered quantum field signal, comprising applying a hybrid digital-analog decoding operation to each qudit and a quantum analog register in an initial state; a quantum memory comprising qudits and configured to store digital quantum information encoded by the quantum signal converter; and a quantum signal transmitter configured to transmit the recovered quantum field signal.

Quantum repeater systems and apparatus for quantum communication. In one aspect, a system includes a quantum signal receiver configured to receive a quantum field signal; a quantum signal converter configured to: sample quantum analog signals from a quantum field signal received by the quantum signal receiver; encode sampled quantum analog signals as corresponding digital quantum information in one or more qudits, comprising applying a hybrid analog-digital encoding operation to each quantum analog signal and a qudit in an initial state; decode digital quantum information stored in the one or more qudits as a recovered quantum field signal, comprising applying a hybrid digital-analog decoding operation to each qudit and a quantum analog register in an initial state; a quantum memory comprising qudits and configured to store digital quantum information encoded by the quantum signal converter; and a quantum signal transmitter configured to transmit the recovered quantum field signal.

A method of scheduling and managing key data in a satellite quantum key distribution system comprising a constellation of one or more satellites and a plurality of user ground stations. The method comprises: using a satellite of the constellation of satellites to deliver key data to a user ground station using a quantum communication link; at the user ground station, storing the delivered key data and reporting the amount of delivered key data; using the satellite to deliver key data to at least one other user ground station requiring common encryption keys with the user ground station using a respective quantum communication link; at each other user ground station, storing the delivered key data and reporting the amount of delivered key data; based upon the reports, determining an amount of the delivered key data which is commonly stored at all of the user ground station and the at least one other user ground station; and instructing the user ground station and the at least one other user ground station to release the commonly stored delivered key data

A method of scheduling and managing key data in a satellite quantum key distribution system comprising a constellation of one or more satellites and a plurality of user ground stations. The method comprises: using a satellite of the constellation of satellites to deliver key data to a user ground station using a quantum communication link; at the user ground station, storing the delivered key data and reporting the amount of delivered key data; using the satellite to deliver key data to at least one other user ground station requiring common encryption keys with the user ground station using a respective quantum communication link; at each other user ground station, storing the delivered key data and reporting the amount of delivered key data; based upon the reports, determining an amount of the delivered key data which is commonly stored at all of the user ground station and the at least one other user ground station; and instructing the user ground station and the at least one other user ground station to release the commonly stored delivered key data

A method of scheduling encryption key delivery communication sessions in a satellite quantum key distribution system comprising a constellation of one or more satellites and a plurality of user ground stations comprises producing a list of user ground stations requiring encryption keys. For each satellite of the constellation of satellites, determining a region of the earths surface within which the satellite can carry out encryption key delivery communication sessions to user ground stations using a quantum optical communications link during a scheduling period. Obtaining a cloud cover map. Comparing the locations of the listed user ground stations, the determined regions of the earths surface for the constellation of satellites, and the cloud cover map, to identify listed user ground stations to which encryption key delivery can be carried out by the constellation of satellites during the scheduling period. Determining which of the identified user ground stations each satellite of the constellation of satellites will carry out encryption key delivery communication sessions with at different times in the scheduling period based upon one or more of: an amount of unused encryption keys at each identified user ground station; and an expected time duration before each identified user ground station runs out of encryption keys.

A method of scheduling encryption key delivery communication sessions in a satellite quantum key distribution system comprising a constellation of one or more satellites and a plurality of user ground stations comprises producing a list of user ground stations requiring encryption keys. For each satellite of the constellation of satellites, determining a region of the earths surface within which the satellite can carry out encryption key delivery communication sessions to user ground stations using a quantum optical communications link during a scheduling period. Obtaining a cloud cover map. Comparing the locations of the listed user ground stations, the determined regions of the earths surface for the constellation of satellites, and the cloud cover map, to identify listed user ground stations to which encryption key delivery can be carried out by the constellation of satellites during the scheduling period. Determining which of the identified user ground stations each satellite of the constellation of satellites will carry out encryption key delivery communication sessions with at different times in the scheduling period based upon one or more of: an amount of unused encryption keys at each identified user ground station; and an expected time duration before each identified user ground station runs out of encryption keys.

A system and method for resisting quantum perturbation threats to quantum communication devices, especially to a quantum cyber security technology for sensing external perturbations to a quantum communication device and for performing perturbation-bias correction in a non-Hermitian system. Through observing and analyzing on a resonant model, such technology not only senses suspicious potential variation which may make potential energy related to a quantum computing device be changed, but also enhances to implement a correction policy coupling to an information-correction sub-system. Meanwhile it patterns the detected perturbation threats with relative permeability so as to provide early protection on a quantum communication device for resisting a risky perturbation threat.

A system and method for resisting quantum perturbation threats to quantum communication devices, especially to a quantum cyber security technology for sensing external perturbations to a quantum communication device and for performing perturbation-bias correction in a non-Hermitian system. Through observing and analyzing on a resonant model, such technology not only senses suspicious potential variation which may make potential energy related to a quantum computing device be changed, but also enhances to implement a correction policy coupling to an information-correction sub-system. Meanwhile it patterns the detected perturbation threats with relative permeability so as to provide early protection on a quantum communication device for resisting a risky perturbation threat.

A photonic Rydberg atom radio frequency receiver includes: an integrated photonic chip; an atomic vapor cell; and a receiver member including: a photonic emitter; probe light reflectors disposed on the atomic vapor cell; and coupling light reflectors disposed on the atomic vapor cell such that the pair of coupling light reflectors is optically opposed across the interior vapor space and receives and reflects the coupling laser light so that the coupling laser light is reflected between the coupling light reflectors multiple times in the interior vapor space of the atomic vapor cell.