Expandable multi-user-set quantum key sharing method

A technology of key sharing and quantum collection, which is applied in key distribution and can solve problems such as users not being online

Active Publication Date: 2018-02-09
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide an expandable multi-user set quantum key sharing method to improve the flexibility of the method, increa

Method used

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Examples

Experimental program
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Embodiment 1

[0043] Embodiment one: see figure 1 As shown, a scalable multi-user set quantum key sharing method, Alice, the original holder of the secret key Ka, prepares the quantum state and expands it as required, and then encodes the secret key on the quantum state and sends it to the remote Users with a distance can obtain the shared secret key through joint measurement.

[0044] Step 1: Alice, the original holder of the secret key Ka, initially prepares a group of m particles of GHZ state and W state according to the specific number of shared users (assumed to be m). The initial GHZ state and W state are in the following form Shown:

[0045]

[0046]

[0047] Alice agrees with the user in advance that the m-particle GHZ state represents the binary number 0, and the m-particle W state represents the binary number 1. Alice can use the prepared GHZ state and W state to encode the secret key Ka she holds, and then share the secret key by sending the GHZ state or W state to the us...

Embodiment 2

[0061] Embodiment 2: share the secret key with the channel after the three-particle GHZ state and the W state are expanded twice, and illustrate the process of the present invention (such as figure 2 shown):

[0062] Alice prepares a set of 3-particle GHZ states and W states in the form:

[0063] ,

[0064] Assuming that the shared secret key Ka=001 owned by Alice, according to the corresponding mapping relationship, the GHZ state represents the binary number 0, and the W state represents the binary number 1. Alice selects two GHZ states and one W state from the prepared quantum states as shared The channel of the secret key. As follows:

[0065]

[0066]

[0067]

[0068] At this time, each particle represents the particle held by the first user in an initial user set. In order to improve the stability of the system and increase the number of users in the user set, Alice expands the selected initial quantum state. Assuming that each user set needs 3 users, ...

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Abstract

The invention discloses an expandable multi-user-set quantum key sharing method. An original holder Alice of a quantum key and sharing users determine that an m-particle GHZ state represents 0, a m-particle W state represents 1, and each particle represents a sharing user. The Alice expands m key-sharing users into m key-sharing user sets as needed and forms a new GHZ state or W state by introducing auxiliary particles. The Alice prepares p corresponding GHZ states or W states according to a key length, extracts one particle from the same position in each GHZ state or W state to form a p-length particle sequence and send the sequence to all users for safety authentication. As long as there is one user in each sharing user set in coordination with all other users in the sharing user sets, an initial key can be restored. The method improves the stability and flexibility of a protocol, reduces the consumption of classic information transmission, and reduces the measurement difficulty andthe equipment requirement of a client.

Description

technical field [0001] The invention relates to a communication method, in particular to an expandable multi-user set quantum key sharing method for quantum secret communication. Background technique [0002] Quantum communication and confidentiality protocol are completed by the two parties in the conversation through the combination of quantum channel transmission and classical channel communication, and generate the shared key necessary for secure communication, that is, random bit stream. Theoretically, the quantum key distribution process has unconditional security, which is guaranteed by the interaction of the perfect basic principles of quantum physics and information theory. At present, quantum key distribution is one of the most promising technologies in quantum information technology. With the development of quantum technology, information transmission can be realized in optical fiber channels or space channels of several kilometers (see Pan Jianwei, Zhang Qiang, M...

Claims

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Application Information

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IPC IPC(8): H04L9/08
CPCH04L9/085H04L9/0852
Inventor 姜敏曹刚王宏基黄旭孙兵
Owner SUZHOU UNIV
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