Abstract
In this paper, two robust quantum dialogue (QD) protocols against collective-dephasing noise and collective-rotation noise are proposed, respectively, by virtue of logical qubits and controlled-not (CNOT) operations. The party in charge of preparation produces logical qubits as travelling states to combat collective noise. The other party knows the initial prepared states of logical qubits with resort to the CNOT operations, and decodes out the preparation partys secret messages with the help of a classical information string sent from the preparation party. The preparation party reads out the other partys secret messages by virtue of quantum secure direct communication. In this way, the risk of information leakage is effectively avoided. Throughout the proposed protocols, only the single-photon measurements are needed for quantum measurements. Compared with previous antinoise QD protocols, the proposed protocols have the highest information-theoretical efficiency. Compared with the recent QD protocols designed by the author which need to prepare two adjacent logical qubits in the same quantum state, the proposed protocols are more experimentally feasible, as they do not have this special requirement.
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call