Quantum communication device and method including at least three parties

A quantum communication and signal technology, which is applied in the field of quantum communication, can solve problems such as inability to code, code rate reduction, etc., and achieve good universality and simplified structure and methods

Pending Publication Date: 2018-10-12
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the existing experiment of measuring equipment-independent quantum key distribution network, the two quantum channels are required to have simila

Method used

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  • Quantum communication device and method including at least three parties
  • Quantum communication device and method including at least three parties
  • Quantum communication device and method including at least three parties

Examples

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Embodiment Construction

[0055] figure 1 It is a schematic structural diagram of a symmetrical measurement device-independent quantum key distribution network in the prior art, such as figure 1 As shown, users 100 and 102 are connected to a third-party relay point 108 via quantum channels 104, 106, which have the same (or similar) losses in the channels.

[0056] figure 2 It is a schematic diagram of the partial structure of the measurement device-independent quantum key distribution network in the prior art, such as figure 2 As shown, the labs of a first user (User 1 ) and a second user (User 2 ) are labeled 200 and 202 in the figure. User 1 (User 2) sends out laser light from the light source 214 (216), attenuates it to the single-photon level using the attenuator 218 (220), modulates its waveform into a pulse using the light intensity modulator 234 (236), and uses the phase The modulator 226 (228) randomizes its phase, uses the acousto-optic modulator 230 (232) to make its light intensity into...

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Abstract

The invention provides a quantum communication device and method including at least three parties. At least three parties comprise at least two users and at least one relay point. The device comprisesa controller for determining the proportion of signal-state light intensity of to-be-sent signals of at least two users and at least one inductive-state light intensity and the intensity parameters of the signal-state light intensity and the inductive-state light intensity; and a modulator connected with the controller and used for modulating the to-be-sent signal according to the proportion andthe intensity parameters, and sending the adjusted to-be-sent signal to at least one relay point. The quantum communication device provided by the invention is suitable for an asymmetric channel and asymmetric channel, when different users transmit the information by using the asymmetric channel, an operation of adding the loss as the channel at one side is unnecessary, and the channel loss can be compensated by only regulating the proportion of the light intensity and the intensity parameters, thereby accomplishing the communication process.

Description

technical field [0001] The present invention relates to the field of quantum communication, in particular to a quantum communication device and method including at least three parties. Background technique [0002] Quantum key distribution (QKD) systems allow two users to share a pair of random keys over a quantum channel. In the BB84 protocol proposed by Bennett and Brassard ("Quantum cryptography: Public key distribution and coin tossing" by C Bennett, G Brassard, International Conference on Computer System and Signal Processing, IEEE (1984)), a user prepares and sends a random A quantum signal of one of non-orthogonal basis vectors. Another user also randomly selects one of the two basis vectors and measures the received quantum signal. They screen out the events that both select the same set of base vectors, and after communicating through an open classical channel, perform error-correction and privacy amplification, and finally obtain a pair of keys. [0003] Example...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04B10/70
CPCH04B10/70H04L9/0852H04L9/0855H04L9/0858
Inventor 徐飞虎王文渊罗开广
Owner UNIV OF SCI & TECH OF CHINA
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