Quantum dialogue protocol with collective-dephasing noise resisting robustness based on logic qubits and CNOT operation

Abstract

The invention provides a quantum dialogue protocol with collective-dephasing noise resisting robustness based on logic qubits and CNOT operation. A preparation party produces the logic qubits serving as a transmission state to resist collective-dephasing noise. The other party knows the initial preparation state of the logic qubits by the aid of the CNOT operation and acquires secret information of the preparation party through decoding with the help of a classic information sequence transmitted by the preparation party. The preparation party reads secret information of the other party by the aid of quantum secure direct communication. In this way, the risk of information leakage is effectively avoided. In the protocol, only single-photon measurement is required for quantum measurement. Compared with a noise-resistant quantum dialogue protocol in the past, the protocol has the highest information theory efficiency. Compared with the recent quantum dialogue protocol that two adjacent logic qubits need to be prepared to be in the same quantum state, the protocol is easier to execute experimentally because the protocol does not have the special request.

Description

technical field [0001] The invention relates to the field of quantum security communication. The invention designs a robust anti-collective dephasing noise quantum dialogue protocol based on logical qubits and non-operation control, and simultaneously solves the information leakage and noise interference problems of the quantum dialogue. Background technique [0002] In 2002, Long and Liu[1] proposed the first Quantum Secure Direct Communication (QSDC) protocol, which means that the dream of using quantum signals to directly transmit secret information from one party to another has become a reality. Then, many good QSDC protocols are constructed from different angles [2-11]. Naturally, one wishes to have a conversation with another through a quantum channel. In 2004, Nguyen [12] and Zhang et al. [13-14] made this dream a reality when they independently proposed a new concept called Quantum Dialogue (QD). In other words, QD enables both parties to exchange information free...

AI Technical Summary

Problems solved by technology

[0062] The purpose of the present invention is to design a robust QD protocol against collective dephasing noise based on logical qubits and CNOT operations, while solving the information leakage problem and noise interference problem of QD

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