High-speed low-voltage phase modulation method

A phase modulation and low-voltage technology, which is applied in the field of quantum cryptography, can solve the problems of high phase modulation voltage and complex DC component coupling of phase modulation signals, and achieve stable realization and solve the effect of too high phase modulation voltage

Active Publication Date: 2014-08-13
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0004] In view of this, the main purpose of the present invention is to provide a high-speed low-voltage phase modulation method to solve the problems that the ph

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[0013] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to specific embodiments and drawings.

[0014] The high-speed low-voltage phase modulation method provided by the present invention is suitable for an out-of-loop phase modulation quantum key distribution system. The out-of-loop phase modulation quantum key distribution system divides an input pulse into two pulses before and after the phase through an unequal arm interference loop. The code is loaded on the relative phase of the two light pulses. For an out-of-loop phase modulation quantum key distribution system, the phase modulator is placed outside the unequal-arm interference ring, and two pulses of the same period pass through the phase modulator.

[0015] The structural framework of the phase modulation quantum key distribution system outside the ring is as follows figure 1 As shown, in a ...

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Abstract

The invention discloses a high-speed low-voltage phase modulation method applied to an external ring modulation quantum key distribution system. When two optical pulses pass through a phase modulator before and after a period, the phase modulator is loaded until the amplitudes of modulation electrical signals of the two optical pulses are inverted, is loaded until the amplitude of the modulation electrical signal of the front optical pulse of the two optical pulses is N, and is loaded until the amplitude of the modulation electrical signal of the back optical pulse of the two optical pulses is -N. By utilizing the high-speed low-voltage phase modulation method, the maximum value of the voltage difference of a electrical signal needed to be provided by an electronics section of the quantum key distribution system is reduced to a half of that in a conventional method, direct current shunt is zero constantly, technological difficulties that phase modulation voltage is too high, each phase modulation signal has direct current component, the coupling is complex, and the like in a phase encoding quantum key distribution system are effectively solved, and the high-speed and stable quantum key distribution system is facilitated.

Description

technical field [0001] The invention belongs to the technical field of quantum cryptography, in particular to a phase modulation method, which is used in a high-speed phase-encoded quantum key distribution system. Background technique [0002] As one of the single quantum technologies with the most application value in quantum physics, quantum cryptography has received more and more attention. As the core of quantum cryptography, quantum key distribution can realize unconditionally secure key sharing in the sense of information theory between remote users. Combining it with "one-time pad" encryption technology can realize unconditionally secure confidential communication. Quantum key distribution implementation systems mostly use photons as bit carriers. In terms of specific encoding methods, there are two main categories: phase encoding and polarization encoding. In traditional optical communication networks, quantum key distribution uses ordinary single-mode fiber as the ...

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Application Information

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IPC IPC(8): H04B10/548H04B10/524H04B10/70H04L9/08
Inventor 王双陈巍银振强何德勇李宏伟周政韩正甫郭光灿
Owner UNIV OF SCI & TECH OF CHINA
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