Preparation and control of atomic optimal entropy squeezing states for a moving two-level atom under control of the two-mode squeezing vacuum fields

Zhou, Bingju; Yi-Man, Liu; Ming-Zhuo, Zhao; Liu, Xiaojuan

doi:10.1088/1674-1056/19/12/124207

Cited by 5 publications

(1 citation statement)

References 23 publications

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“…[14][15][16] The sudden generation and control of an atomic optimal entropy squeezing state (OESS) have also been studied in our previous work with different Jaynes-Cumming models (JCM). [17,18] On the other hand, two-photon JCM (TPJCM) has aroused much interest in recent years because of two-photon microwave maser running successfully and its property of the periodicity of quantum mechanical channels. [19] Therefore it is an important tool for transmitting quantum information correctly in the quantum communication field.…”

Section: Introductionmentioning

confidence: 99%

Preparation of optimal entropy squeezing state of atomic qubit inside the cavity via two-photon process and manipulation of atomic qubit outside the cavity

Bing-Ju¹,

Zhao-Hui²,

Jia³

et al. 2014

Chinese Phys. B

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Considering two atomic qubits initially in Bell states, we send one qubit into a vacuum cavity with two-photon resonance and leave the other one outside. Using quantum information entropy squeezing theory, the time evolutions of the entropy squeezing factor of the atomic qubit inside the cavity are discussed for two cases, i.e., before and after rotation and measurement of the atomic qubit outside the cavity. It is shown that the atomic qubit inside the cavity has no entropy squeezing phenomenon and is always in a decoherent state before the operating atomic qubit outside the cavity. However, the periodical entropy squeezing phenomenon emerges and the optimal entropy squeezing state can be prepared for the atomic qubit inside the cavity by adjusting the rotation angle, choosing the interaction time between the atomic qubit and the cavity, controlling the probability amplitudes of subsystem states. Its physical essence is cutting the entanglement between the atomic qubit and its environment, causing the atomic qubit inside the cavity to change from the initial decoherent state into maximum coherent superposition state, which is a possible way of recovering the coherence of a single atomic qubit in the noise environment.

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Section: Introductionmentioning

confidence: 99%