Reconfigurable receiving chip for quantum key distribution

Abstract

The invention discloses a reconfigurable receiving chip for quantum key distribution, and the chip comprises a first adjustable optical branching device which is used for the adjustable light splitting of an input optical signal, and configuring different quantum key distribution protocol decoding demands; a second adjustable optical branching device which is used for adjustably splitting the input optical signal; a third adjustable optical branching device and a fourth adjustable optical branching device which are used for adjustably splitting the input optical signal and have the same structural parameters; a first optical delay line and a second optical delay line have the same structural parameters and are used for delaying an input optical signal; the first phase modulator and the second phase modulator are used for adjusting the phase of the input optical signal and have the same structural parameters; a fifth adjustable optical branching device and a sixth adjustable optical branching device which are used for adjustably splitting the input optical signal and have the same structural parameters; each unit is of an optical waveguide structure and is integrated on the same substrate. The reconfigurable multi-protocol decoding requirement can be met, the structure is compact, the integration level is high, the stability is good, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of quantum communication, in particular to a reconfigurable receiving chip for quantum key distribution. Background technique [0002] Quantum communication is an interdisciplinary subject based on quantum mechanics and guided by modern communication theory. Since its birth, due to the accuracy and completeness of its model, with the efforts of generations of scientists, it has gradually developed from theoretical conception to practical application. . With the development of quantum computers, classical encryption techniques are facing unprecedented challenges. In January 2018, Intel released a superconducting quantum test chip with 38 qubits at the Consumer Electronics Show in Las Vegas, USA. In March 2018, Google demonstrated the newly developed 72-qubit programmable superconducting quantum processor "Bristlecone", saying that this processor is expected to achieve "quantum superiority". In September 20...

AI Technical Summary

Problems solved by technology

At present, the decoding receiving end in the quantum key distribution system is mostly built with three-dimensional optical components, which is large in size, complex in structure, poor in stability, and high in cost, and one receiving end only supports a single quantum key distribution protocol. , adaptability, and poor versatility are not conducive to popularization and application. Therefore, it is urgent to design a reconfigurable multi-protocol compatible quantum key distribution receiving chip with compact structure, high integration, good stability, and low cost.

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