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Polarization and phase entangled coding method and apparatus, and quantum key distribution system

A technology of phase coding and coding device, which is applied in the field of optical transmission security communication, and achieves the effect of simple method and easy implementation.

Inactive Publication Date: 2017-08-18
CHINA ACADEMY OF ELECTRONICS & INFORMATION TECH OF CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are few reports on the conversion method between polarization encoding and phase encoding in quantum secure communication

Method used

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  • Polarization and phase entangled coding method and apparatus, and quantum key distribution system
  • Polarization and phase entangled coding method and apparatus, and quantum key distribution system
  • Polarization and phase entangled coding method and apparatus, and quantum key distribution system

Examples

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no. 1 example

[0070] The first embodiment of the present invention, a polarization and phase entanglement encoding method, such as figure 1 shown, including the following specific steps:

[0071] Step S101: converting the first photon in the polarization-entangled photon pair generated by the polarization-entangled light source from polarization encoding to phase encoding.

[0072] Specifically, a polarization-entangled light source generates a pair of polarization-entangled photons. The polarization state of the polarization-entangled photon pair is a set of orthogonal polarization states. The commonly used orthogonal polarization states are a set of linear polarization states for horizontal and vertical polarization, a set of linear polarization states for 45° and -45° polarization, and a left-handed polarization state. and a set of circular polarization states of right-handed circular polarization. Taking a set of linear polarization states with horizontal and vertical polarization as ...

no. 2 example

[0089] In the second embodiment of the present invention, a polarization and phase entanglement encoding device, such as figure 2 As shown, it specifically includes the following components: a polarization beam splitter 201, two phase encoders 202 and 203, and a beam combiner 204;

[0090] 1) The polarization beam splitter 201 is used to split the first photon in the polarization-entangled photon pair generated by the polarization-entangled light source into photons transmitted on two sub-optical paths.

[0091] Specifically, the eigenstate of the orthogonal basis of the polarization beam splitter 201 is the same as the orthogonal polarization state of the first photon, and the polarization beam splitter 201 splits the orthogonal polarization state of the first photon into the Two sub-light paths.

[0092] 2) Phase encoders 202 and 203 are respectively arranged on the two sub-optical paths between the polarization beam splitter 201 and the beam combiner 204, and the phase en...

no. 3 example

[0104] The third embodiment of the present invention, a polarization and phase entanglement encoding device, such as image 3 As shown, it specifically includes the following components: a polarization beam splitter 301 , two phase encoders 302 and 305 , two mirrors 303 and 304 , a beam combiner 306 , and a polarizer 307 .

[0105] Any one of the polarization-entangled photon pairs generated by the polarization-entangled light source is input to the polarization beam splitter 301, and the polarization beam splitter 301 splits the two orthogonal polarization states of the incident photons into two sub-optical paths for transmission. After one path is phase-encoded by the phase encoder 302, it is reflected to an input port of the beam combiner 306 by the mirror 303; after the other path is reflected by the mirror 304, it is phase-encoded by the phase encoder 305 and output to the beam combiner 306 another input port. The two sub-optical paths reach the beam combiner 306 synchro...

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Abstract

The invention provides a polarization and phase entangled coding method and apparatus, and a quantum key distribution system. The method comprises the steps of converting a first photon in a polarization entangled photon pair generated by a polarization entangled light source from a polarization code into a phase code; and forming a polarization and phase entangled photon pair by the first photon with the polarization code converted into the phase code and a second photon in the polarization entangled photon pair. The quantum key distribution system based on the polarization and phase entangled coding apparatus can fully use the transmission advantages of different codes in different channels. When transmission of different channels is realized, the photon is converted from the polarization code to the phase code. Through adoption of the quantum key distribution system, the quantum key distribution demand of the free space and optical fiber mixed channel transmission is met.

Description

technical field [0001] The invention relates to the technical field of optical transmission secure communication, in particular to a polarization and phase entanglement encoding method, device and quantum key distribution system. Background technique [0002] One of the main technical approaches to realize wide-area quantum secure communication is to establish a space-based quantum secure communication satellite network and a ground metropolitan / intercity quantum secure communication optical fiber network, and to connect the ground optical fiber channel to each urban / intercity quantum satellite network through a free space channel quantum satellite network. The main node of the intercity quantum security communication network, realizing wide-area quantum security communication. In the wide-area quantum security communication system, the coded light quantum needs to be transmitted in two channels of free space and optical fiber, and cannot be detected during the transmission ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04L29/06
CPCH04B10/70H04L9/0819H04L9/0852H04L9/0858H04L63/062
Inventor 许华醒朱冰莫小范程旭升
Owner CHINA ACADEMY OF ELECTRONICS & INFORMATION TECH OF CETC
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