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Semi-quantum dialogue method based on single photon and requesting classic communicator to possess measuring capability

A technology of classical communication and quantum dialogue, applied in the field of quantum cryptography

Active Publication Date: 2018-02-06
嘉兴市顺凯鹿科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this requirement may be impractical since not both communicators can afford expensive quantum resources and operations

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  • Semi-quantum dialogue method based on single photon and requesting classic communicator to possess measuring capability

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Embodiment

[0125] 1. Application example of SQD method

[0126] Here, an example is used to further illustrate the two-way communication process of the method of the present invention. Suppose Bob has four secret classic bits "0011" and Alice has four secret classic bits "0101". Moreover, it is assumed that the four information single photons prepared by Alice for encoding in step S1 are {|0>, |1>, |0>, |1>}. In step S4, Bob can know the initial state of these four information single photons through his Z-based measurement. After Bob's encoding, these four information single photons are transformed into {|0>,|1>,|1>,|0>}. Further, after Alice's encoding in step S6, these four information single photons are transformed into {|0>, |0>, |1>, |1>}. Alice measures these four information single photons with the Z basis and announces their final states to Bob. According to the final state of these four information single photons, his own secret canonical bits and their initial states he kno...

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Abstract

The invention provides a semi-quantum dialogue method based on single photon and requesting a classic communicator to possess measuring capability; the method employs the single photon as a quantum carrier so as to realize mutual exchange of secret messages between a quantum communicator and a classic communicator. The method can use the following technologies to ensure safety when facing externalEve active attacks: the complete robustness of an existing semi-quantum key distribution method, classic one-time pad encryption, classic communicator scrambling operations and decoy photon technology. The classic communicator can make classic base measurement for the information single photons, thus sharing initial states of the single photons with the quantum communicator. The method can solvethe information leaking problems. Compared with a conventional information leak-free quantum dialogue method, the advantages are that the method only requests one communicator to possess the quantum capability. Compared with a conventional semi-quantum dialogue method, the advantages are that the method employs the single photon as the quantum carrier instead of using a two-photon entangled state.The semi-quantum dialogue method can be realized by existing quantum technology.

Description

technical field [0001] The invention relates to the field of quantum cryptography. The present invention designs a semi-quantum dialogue method based on single photons that requires classical communicators to have measurement capabilities, and realizes mutual exchange of secret messages between a quantum communicator and a classical communicator. Background technique [0002] Quantum cryptography, born from the forward-looking quantum key distribution (Quantum key distribution, QKD) method [1] proposed by Bennett and Brassard in 1984, uses the properties of quantum mechanics rather than the computational complexity of mathematical problems to achieve unconditional security . Quantum cryptography has attracted a lot of attention and established many interesting branches, such as QKD[1-5], Quantum secure direct communication (Quantum secure direct communication, QSDC)[6-13], Quantum secret sharing (Quantum secretsharing, QSS) [14-18] et al. [0003] QKD focuses on using the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/70H04B10/85H04L9/08
CPCH04B10/70H04B10/85H04L9/0852H04L9/0858H04L9/0869
Inventor 叶天语叶崇强
Owner 嘉兴市顺凯鹿科技有限公司
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