Entropy squeezing of a moving atom and control of noise of the quantum mechanical channel via the two-photon process

• 来源期刊: 中国物理（英文版）
• 关键词: entropy squeezing atomic motion and field-mode structure quantum mechanical channel two-photon process
• 年，卷（期）: 2007,（2）
• 页码范围: 420-428
• 页数: 9页
• 语种: 英文

摘要

Based on the quantum information theory, we have investigated the entropy squeezing of a moving two-level atom interacting with the coherent field via the quantum mechanical channel of the two-photon process. The results are compared with those of atomic squeezing based on the Heisenberg uncertainty relation. The influences of the atomic motion and field-mode structure parameter on the atomic entropy squeezing and on the control of noise of the quantum mechanical channel via the two-photon process are examined. Our results show that the squeezed period,duration of optimal entropy squeezing of a two-level atom and the noise of the quantum mechanical channel can be controlled by appropriately choosing the atomic motion and the field-mode structure parameter, respectively. The quantum mechanical channel of two-photon process is an ideal channel for quantum information (atomic quantum state) transmission. Quantum information entropy is a remarkably accurate measure of the atomic squeezing.