Step transmission quantum safety direct communication method

A secure direct communication, quantum technology, applied in key distribution, can solve the problems of low capacity, low security, low quantum state encoding capacity, etc.

Active Publication Date: 2006-08-16
TSINGHUA UNIV
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Problems solved by technology

[0057] The disadvantages of this quantum safe direct communication scheme are: 1. The security is not high; 2. The encoding capacity of the quantum state is not high
The reason why the capacity is not high is that each particle completes the double journey back and forth and only transmits the information of one qubit. The internal root is that Alice and Bob only choose the  basis to complete the single-particle measurement, so they can only choose U 0 and U 3 two unitary operations

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  • Step transmission quantum safety direct communication method
  • Step transmission quantum safety direct communication method
  • Step transmission quantum safety direct communication method

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Embodiment Construction

[0102] In order to make the object, technical solution and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0103] The invention provides a step-by-step quantum secure direct communication method, the main idea of ​​which is: using the non-cloning principle in quantum mechanics and the coherence between entangled particles and the quantum characteristics of non-locality, to ensure that the eavesdropper Under the premise that no useful information can be obtained, by selecting all possible quantum operations on the quantum state, the information to be transmitted is directly loaded on the quantum state, and the effective information is directly transmitted through the quantum channel, especially the confidential information, so that the coding capacity reaches up the max. The essential difference between it and the quantum key distribution s...

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Abstract

This invention discloses a method for direct quantum communication transmission in steps safely utilizing the coherence and non-locality of tangling particles to load the effective information onto the quantum state directly in terms of a coding way agreed on by send/receive parties to transmit the effective information on the quantum channel in steps. Transmission in steps means that at least a set information of tangling particles in a same quantum state is divided into two related particle sequences, the two sides transmit one particle sequence first then the send party codes its own particle sequence and sends it to the receiver to be read out by a joint measurement device.

Description

technical field [0001] The present invention relates to quantum security communication technology, in particular to a step-by-step transmission quantum security direct communication method. Background technique [0002] Quantum communication is an interdisciplinary subject developed in the past two decades, mainly including quantum cryptography communication, quantum secret sharing and quantum secure direct communication. The role of quantum cryptography communication is to establish and transmit codebooks, that is, to distribute keys between two parties in secure communication. So far, quantum cryptography communication has become a relatively mature technology. Quantum cryptography communication equipment has been formally produced abroad, and the research on quantum cryptography communication has also received strong support and widespread attention from all countries in the world; quantum secret sharing is functionally related to Similar to quantum cryptography communic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/30H04K1/00H04B10/70H04L9/08
Inventor 邓富国龙桂鲁
Owner TSINGHUA UNIV
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