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Quantum key distribution method based on single photon superdense coding

A technology of quantum key distribution and ultra-dense coding, which is applied in the field of quantum secure communication, can solve problems such as complex quantum resources and equipment, and achieve the effect of high coding capacity

Active Publication Date: 2019-03-26
JIANGSU ELECTRIC POWER CO +4
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects that entangled QKD requires complex quantum resources and equipment, and propose an economically feasible quantum key distribution method based on single-photon ultra-dense encoding

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  • Quantum key distribution method based on single photon superdense coding
  • Quantum key distribution method based on single photon superdense coding

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Embodiment Construction

[0025] The present invention will be further described below. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0026] Such as figure 1 As shown, the quantum key distribution process based on single-photon ultra-dense encoding is divided into four columns, and each column indicates the subject, photon state and operation. The quantum key distribution method based on single-photon ultra-dense coding of the present invention comprises the following steps:

[0027] 1) As shown in the first column, the user Alice prepares a single photon state |Ψ>, and |Ψ> is randomly in |0> or |1>, that is, the R ground state. In the actual operation process, the length of the bit string satisfying the required sharing is realized by executing the method of the present invention multiple times.

[0028] Alice then uses U with probability (1-P) / 2 00 deflection operat...

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Abstract

The invention discloses a quantum key distribution method based on single photon superdense coding. The method comprises the following steps that a party A prepares a photon state which is randomly inan R ground state, carries out deflection operation on the photon state and then sends the photon state to a party B; the party B carries out the deflection operation on the photon state again and then returns the photon state to the party A; the party A compares a measured quantum state with originally prepared quantum state and sends a comparison result to the B party; the party A judges whether employed measurement basis is accurate or not, carries out marking if the employed measurement basis is accurate, sends marked location information to the party B and discards wrong location information; and the party A and the party B generate a shared bit string according to own information and received information. Compared with an entangled state QDKD (Quantum Dense Key Distribution) protocol, the method has the advantages that complex quantum resources and equipment are avoided, and the method is more economic and feasible.

Description

technical field [0001] The invention is a quantum key distribution method based on single-photon ultra-dense coding, which belongs to the technical field of quantum secret communication. Background technique [0002] With the application of quantum mechanics theory in the field of information processing, quantum secure communication is used to accomplish many interesting tasks, such as quantum key distribution (quantum key distribution, QKD), quantum secret sharing (quantum secretsharing, QSS), quantum key Negotiation (quantum key agreement, QKA), etc. Among them, QKD is the most basic and important research direction, which is used to generate private keys between two legitimate users, and the two users can safely communicate their secret messages with the help of private keys. Generally, these QKD protocols can be divided into two categories: single-photon-based QKD protocols, such as BB84 and E92, etc.; the other is entangled-based QKD protocols. Among the above two cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/70H04L9/08
CPCH04B10/70H04L9/0852H04L9/0858
Inventor 李维高莉莎胡倩倩冯宝张影严东贾玮完颜绍澎吕超朱雪阳刘金锁马亚妮
Owner JIANGSU ELECTRIC POWER CO
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