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Controlled quantum security direct communication method based on four particle cluster states

A secure direct communication, four-particle technology, applied in the field of controlled quantum secure direct communication based on cluster states, can solve problems such as entanglement property destruction, achieve high security, long sequence period, and good random performance

Active Publication Date: 2017-09-29
NORTHWEST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this scheme, once the GHZ state used is measured, the entanglement property is destroyed

Method used

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  • Controlled quantum security direct communication method based on four particle cluster states
  • Controlled quantum security direct communication method based on four particle cluster states
  • Controlled quantum security direct communication method based on four particle cluster states

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Embodiment Construction

[0033] Quantum states commonly used in communications in the past include Bell state, GHZ state, and W state. This scheme uses a four-particle cluster state. Because the cluster state has better continuous entanglement characteristics, which makes the self-correlation structure stable, even if it is measured, the entanglement characteristics are not easy to be destroyed, and it is not easy to be disturbed by the decoherence effect. measurement, the remaining two particles are projected into a Bell state, and continue to maintain the entangled state. Therefore, in such an encryption scheme, Alice does not use entanglement exchange, but passes the quantum state through the local unitary operation and sends the measured classical bit string to the legitimate receiver, and the receiver can only recover with the permission of the controller Charlie. The original information further improves the security of the communication process.

[0034] Assume that Alice and Bob are the legal...

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Abstract

The invention discloses a controlled quantum security direct communication method based on four particle cluster states. Alice and Bob respectively serve as a legal information sender and a legal information receiver during a quantum communication process, and Charlie serves as a credible scheme control party; information security is achieved by randomly inserting a single photon to perform measurement-based comparison detection, and communication starts after security detection; Alice uniformly divides the prepared four particle cluster states into two groups, after being subjected to an XOR operation with a pseudorandom sequence, the sent information is encoded on the two particles reserved by Alice via unitary transformation. Alice performs Bell-based measurement on reserved particles, and sends measurement information to Bob, and Bob recovers the original sequence via an initial state sent by Charlie after the measurement information is compared. The four particle cluster states used by the method has good entanglement, connectivity and damage resistance, only the receiver Bob in the method gets the permission of the controller Charlie, Bob can recover the original information, so that the information can be effectively prevented from being attacked during a transmission process, and an implementation process is simple.

Description

technical field [0001] The invention belongs to the technical field of quantum security communication, and in particular relates to a controlled quantum security direct communication (CQSDC) method based on a cluster state. Background technique [0002] Quantum communication uses the principle of quantum mechanics for information transmission and processing, which has the advantages of high security and high capacity. Quantum secure direct communication is a new type of quantum communication mode that directly transmits secret information in quantum channels, and has developed rapidly in recent years. [0003] Document 1 "Li Songsong, Nie Yiyou, Hong Zhihui, Yi Xiaojie, Huang Yibin, Controlled Teleportation Using Four-Particle Cluster State [J]. Communication Theory Phys, 2008, 50(9): 633-636." proposed a method based on A four-particle cluster state controllable information transmission scheme. In this scheme, the quantum information of the single-photon state or the enta...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04B10/70
CPCH04B10/70H04L9/0852
Inventor 曹正文宋丹彭进业曾贵华李艳赵光
Owner NORTHWEST UNIV
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