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Science in China. Series G, Physics, mechanics & astronomy/Science in China. Series G, Physics, Mechanics & Astronomy

Quantum secure direct communication over the collective amplitude damping channel

Su‐Juan Qin, Qiaoyan Wen, Luoming Meng, Fu-Chen Zhu

Published May 26, 2009• 45 citations
Publisher
DOI
10.1007/s11433-009-0140-z

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Quantum key distribution(QKD) is an important area in quantum information theory. There are two kinds of QKD protocols, one is so-called prepare-measure protocols and the other is entanglement-based protocols. For long-distance communications in a noisy environment, entangled-based protocols might be more reliable since they could be supplied by distilled procedures which protect them from noises. In this paper, entanglement-based QKD over certain noisy channels are discussed. We give schemes against collective noises, including collective dephasing(CD) and collective rotation(CR), Pauli noises, amplitude damping(AD) noises, phase damping(PD) noises and mixtures of them. Our discussions are in a direction about how to implement a QKD protocol over noisy channels as in a noiseless channels with no errors, in theoretical. Also, we analyse the efficiency of our schemes, demonstrating that they could be more efficient than the standard entanglement-based QKD scheme.
Quantum secure direct communication (QSDC) enables the direct and secure transmission of messages without the need for prior key distribution, offering a groundbreaking paradigm in quantum communication. This paper presents a novel symmetric QSDC protocol that ensures immunity to collective-phase and collective-rotation noises while enabling efficient and two-way message transfer. The proposed protocol features an innovative approach where qubits are transmitted only during the initial entanglement sharing phase, eliminating the need to send message carrying qubits thereafter. By leveraging this design, the protocol minimizes vulnerability to external noise and eavesdropping attempts. The symmetry of the protocol allows both parties to exchange messages seamlessly and securely, ensuring equal communication procedure. Analytical analysis and theoretical proofs demonstrate the robustness and security of the protocol under non-secure quantum channel, marking a significant advancement in practical quantum communication systems. The proposed scheme follows an entanglement-based QSDC paradigm, where confidential information is embedded into quantum correlations rather than being directly transmitted over the quantum channel.