Receiving terminal for quantum key distribution system and quantum key distribution system

A quantum key distribution and receiving end technology, applied in the field of quantum key distribution systems, can solve problems such as unfavorable popularization and application, high system cost, and expensive single-photon detectors, and achieve the effect of reducing cost and improving code rate.

Active Publication Date: 2017-02-01
ZHEJIANG SHENZHOU QUANTUM NETWORK TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0012] However, in the existing QKD system based on wavelength division multiplexing, a set of polarization-coded BB84 protocol quantum receiving devices requires 4 single-photon detectors, and a set of phase-coded BB84 protocol quantum receiving devices requires 2 single-photon detectors. When N sets of transmitting devices and quantum receiving devices are used for multiplexing, at least 2N single-photon detectors are required, and the price of each single-photon detector is already very expensive, so the cost of the system will be very high, which is not conducive to actual promotion application

Method used

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  • Receiving terminal for quantum key distribution system and quantum key distribution system
  • Receiving terminal for quantum key distribution system and quantum key distribution system
  • Receiving terminal for quantum key distribution system and quantum key distribution system

Examples

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Embodiment 1

[0041] see figure 2 , the present embodiment is a QKD system based on an array single photon detector, including Alice, a first wavelength division multiplexer (WDM1), a second wavelength division multiplexer (WDM2) and Bob.

[0042] Alice is equipped with QKD encoding module 1 ~ QKD encoding module n, light source 1 ~ light source n, the light emitted by each light source is attenuated to a single photon state by the corresponding attenuator (ATT) and then enters the respective QKD encoding module. Each wavelength corresponds to A QKD encoding module was developed.

[0043] WDM1 multiplexes multiple channels of optical signals of different wavelengths output by each QKD encoding module in Alice into the transmission fiber, WDM2 demultiplexes multiple channels of optical signals of different wavelengths in the transmission fiber To the corresponding QKD decoding module 1~QKD decoding module n in Bob, each decoding module is an unequal arm interference module, which can inter...

Embodiment 2

[0047] see image 3 , the present embodiment differs from Embodiment 1 in that a first array detector and a second array detector are provided in the detecting part, and two wavelength division multiplexers (WDM3 and WDM4) and two beam splitters are correspondingly provided module.

[0048] The QKD decoding module corresponding to each wavelength in Bob has two outputs of the straight-through arm and the cross-arm respectively corresponding to two different interference results. The corresponding two outputs of QKD decoding module 1 are recorded as λ1 straight and λ1 intersection. The corresponding two outputs of module n are denoted as λn direct and λn intersecting. Connect the output of the straight-through arm of each QKD decoding module (λ1 straight, λ2 straight...λn straight) to the input of WDM3, and WDM3 multiplexes each wavelength of the straight-through arm into one optical fiber, carrying the multi-wavelength information of the straight-through arm The output end o...

Embodiment 3

[0070] see Image 6 , and the difference from Embodiment 2 is that, after the QKD decoding module in Bob, a densely packed optical fiber array, a microlens array and an array detector are sequentially arranged.

[0071] The QKD decoding module corresponding to each wavelength in Bob has two outputs, a straight-through arm and a cross arm. The output port of the QKD decoding module is connected to the input port of the densely packed optical fiber array. The densely packed optical fiber array is a regular collection of multiple optical fibers. In order to realize the optical elements arranged in a certain order in space, the densely packed optical fiber array has 2N optical fiber input ports and 1 output port, the output port has 2N optical fiber pixels, and the output end of each optical fiber is in the dense A pixel on the output end face of the array of optical fibers, the size and arrangement of the pixels on the output end face of the densely packed optical fiber array are...

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Abstract

The invention discloses a receiving terminal for a quantum key distribution system. The receiving terminal comprises a decoding module for processing signal light from a sending terminal and a detector. At least one paths of signal light is provided. The detector is an array detector. Each path of signal light is decoded by the decoding module and then enters a corresponding detection unit in the array detector. In addition, the invention also discloses a quantum key distribution system using the receiving terminal. Therefore, when transmitted multi-path signal light needs to be detected, utilization of multiple sets of single photon detectors is avoided. Because of the array detector way, the costs are lowered and integration and miniaturization of the product can be realized well.

Description

technical field [0001] The invention relates to the technical field of quantum secure communication, in particular to a quantum key distribution system. Background technique [0002] Quantum key distribution (QKD) is based on quantum mechanics and cryptography. Its security is guaranteed by the basic principles of quantum mechanics - Heisenberg's uncertainty principle and quantum non-cloning theorem, which can ensure the security of key distribution and transmission. safety. Using the security key generated by the QKD system, combined with the "one-time pad" encryption method, unconditionally secure and confidential communication can be realized. [0003] The key generation rate, namely the code rate, is an important indicator to measure the performance of the QKD system. A high code rate can encrypt more data and form a more complex encryption system. However, due to the limited operating frequency of lasers and single-photon detectors , the coding rate of the QKD system ...

Claims

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Application Information

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IPC IPC(8): H04L9/08
CPCH04L9/0852H04L9/0858
Inventor 富尧李浩泉
Owner ZHEJIANG SHENZHOU QUANTUM NETWORK TECH CO LTD
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