Phase encoding device for quantum key distribution and quantum key distribution system

A quantum key distribution and phase encoding technology, which is applied in the field of phase encoding devices and quantum key distribution systems, can solve the problems of high cost, complexity and high requirements, so as to improve energy utilization, improve security code rate, reduce The effect of cost and complexity

Active Publication Date: 2021-11-26
ZHEJIANG QUANTUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above defects in the prior art, the present invention proposes a phase encoding device for quantum key distribution and a quantum key distribution system to solve the high requirements of the quantum key distribution system for the phase mod

Method used

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  • Phase encoding device for quantum key distribution and quantum key distribution system
  • Phase encoding device for quantum key distribution and quantum key distribution system
  • Phase encoding device for quantum key distribution and quantum key distribution system

Examples

Experimental program
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Example Embodiment

[0037] like image 3 As shown, the phase encoding apparatus of the present invention is described in Example 1:

[0038] The structure of the phase encoding apparatus is that the unequal arm polarization interferometer includes a first beamformer BS1, a polarization beamformer PBC, and the first optical path selection element OS1 is the first optical switch OSW1, the second The optical path selection element OS2 is a carrier BC, and the phase encoding device further includes a third laser L3, a third partial bundlers BS3, a second annulus CIR2, a third annular CIR3. The third laser L3 is connected as a seed laser, coupled to the input port of the third partial bundar BS3, and two output ports of the third partial bundlers BS3 are respectively associated with the second annulus CIR2 and third annular Cir3, respectively. One-port is connected, the second annular Cir2, the second port of the third annular CIR 3 is connected to the first laser L1, the second laser L2, the second annulu...

Example Embodiment

[0046] like Figure 4 As shown, the phase encoding device of the present invention is described in the second example.

[0047] The structure of the phase encoding apparatus is: the ingredient-polarizing interferometer includes a first beamforcer BS1, a polarization beam selector PBC, and the first optical path selection element OS1 is a fourth beam BS4, the first The two-transparent element OS2 is the second optical switch OSW2, and the polarization, the PBC includes four ports, and the phase encoding device further includes a fourth laser L4 and is coupled to a fourth port of the polarizer PBC.

[0048] The second phase encoding process includes:

[0049] The fourth laser L4 serves as a seed laser, and the short arm of the non-equal arm polarization interferometer through the polarization beam PBC into the first laser L1 and the second laser L2, respectively, injecting the two. When the first laser L1 is triggered, the second laser L2 does not trigger, generates horizontally pola...

Example Embodiment

[0052] like Figure 5 As shown, the phase encoding device of the present invention is described in the third example of the third:

[0053] The structure of the phase encoding apparatus is: the inequal arm polarization interferometer includes a second beam member BS2, a first deserser POL1, a second deserial POL2, a first mirror M1, a second mirror M2, and The first annular CIR1. The first port of the second beam base BS2 is fixed 45 ° between the polarization fibers between the first laser L1, the polarity fiber between the first port of the first annulus CIR1 and the second laser L2. A 45 ° welding is performed, and the second port of the first annular CIR1 is connected to the second port of the second beamforcer BS2, and the third port of the first annular CIR1 is the third port of the uniform arm polarized interferometer. The port is placed at the third port of the second beam BS2, the polarization direction and the horizontal direction angle of 0 °, the second deserial POL2 is ...

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Abstract

The invention discloses a phase encoding device for quantum key distribution. The phase encoding device comprises a first laser L1, a second laser L2, an unequal-arm polarization interferometer, a first optical path selection element OS1, a second optical path selection element OS2 and a quarter-wave plate QWP. The first optical path selection element OS1 and the second optical path selection element OS2 form an equal-armed Mach-Zehnder interferometer, the quarter-wave plate QWP is located on one arm of the equal-armed Mach-Zehnder interferometer, and the invention further provides a quantum key distribution system. Compared with the prior art, the phase encoding device has the advantages that four phase encoding states required by a BB84 protocol can be prepared without a phase modulator, polarization of two time modes is perpendicular to each other, non-interference components are easy to eliminate through polarization selection, and the energy utilization rate is increased. The cost and complexity of the coding device can be reduced, and the secure code rate of the quantum key distribution system can be improved.

Description

technical field [0001] The invention relates to the technical field of quantum phase encoding, in particular to a phase encoding device and a quantum key distribution system for quantum key distribution. Background technique [0002] Quantum key distribution (quantum key distribution, QKD) can provide unconditionally secure key distribution for long-distance communication parties, and its information theory security is guaranteed by the basic principles of quantum mechanics. At present, the quantum key distribution system of the BB84 protocol is becoming more and more mature and has become practical. The commonly used encoding methods of the BB84 protocol are polarization encoding and phase encoding. Due to the birefringence effect of the optical fiber channel, it is easy to be affected by the environment, resulting in random changes in the polarization state of photons, and the polarization encoding method is not stable enough, so phase encoding is often used. Such as fi...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04B10/70H04B10/556
CPCH04L9/0858H04B10/70H04B10/5561
Inventor 齐若琳蒋荻席鹏
Owner ZHEJIANG QUANTUM TECH CO LTD
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