Steady and optimal entropy squeezing for three types of moving three-level atoms coupled with a single-mode coherent field

A system composed of a single-Cooper-pair box irradiated by a single-mode quantized field has been considered. The entanglement relative to the mixedness μ and the detuning δ is investigated with negative partial transpose. It is found that in the case of initial mixed state, the entanglement is weakened, but increases as time evolves. For a detuned system, the entanglement is further suppressed but more stationary than that for a resonant system.

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An exact solution of evolution of the field entropy in a system of three-level cascade type atom interacting with single-mode coherent field

Acta Physica Sinica ◽

10.7498/aps.59.3221 ◽

2010 ◽

Vol 59 (5) ◽

pp. 3221

Author(s):

Cong Hong-Lu ◽

Ren Xue-Zao ◽

Jiang Dao-Lai ◽

Liao Xu

Keyword(s):

Exact Solution ◽

Single Mode ◽

Coherent Field ◽

Cascade Type

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ENTANGLEMENT FOR JAYNES CUMMINGS MODEL IN THE PRESENCE MULTI-PHOTON PROCESS UNDER DECOHERENCE EFFECT

International Journal of Quantum Information ◽

10.1142/s0219749913500263 ◽

2013 ◽

Vol 11 (03) ◽

pp. 1350026 ◽

Cited By ~ 1

Author(s):

S. ABDEL-KHALEK ◽

M. S. ALMALKI

Keyword(s):

Quantum Computer ◽

Single Mode ◽

Entanglement Dynamics ◽

Nonlocal Correlation ◽

Phase Damping ◽

Level Atom ◽

Coherent Field ◽

Photon Process ◽

Quantized Field ◽

Decoherence Effect

The quantum nonlocal correlation between an atom and coherent field is described quantitatively in terms of multi-photon and phase damping processes. Especially, considering a two-level atom interacts with a single-mode quantized field in a coherent state inside a phase-damped cavity, and taking into account the number of multi-photon transitions and phase damping effect, the entanglement is investigated during the time evolution as a function of involved' parameters in the system. The results show that the enhancement of the transitions are very useful in generating a high amount of entanglement. Due to the significance of how a system is quantum correlated with its environment in the construction of a scalable quantum computer, the entanglement dynamics between the bipartite system with its environment is evaluated and investigated during the dissipative process. Finally, the physical interpretation of the correlation behaviors between the subsystems is explained through the statistical properties of the field.

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JOSEPHSON MESOJUNCTIONS AS DETECTORS OF LOW-INTENSITY QUANTIZED COHERENT FAR-INFRARED FIELDS

International Journal of Modern Physics B ◽

10.1142/s0217979200003381 ◽

2000 ◽

Vol 14 (25n27) ◽

pp. 3104-3109 ◽

Cited By ~ 2

Author(s):

R. MIGLIORE ◽

A. MESSINA ◽

A. NAPOLI

Keyword(s):

Josephson Junction ◽

Quantum Noise ◽

Single Mode ◽

Far Infrared ◽

Shapiro Step ◽

Low Intensity ◽

Quantum Nature ◽

Coherent Field ◽

Quantized Fields

We show that the quantum nature of a mesoscopic Josephson junction may be exploited for detecting low-intensity electromagnetic quantized fields. In particular we prove that intensity and phase of single-mode quantized coherent field may be reconstructed measuring amplitude and quantum noise of the first quantum Shapiro step occurring in the I-V characteristic of the ultrasmall Josephson junction.

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