MIXED-STATE ENTANGLEMENT IN A SINGLE-COOPER-PAIR BOX DETUNED WITH A 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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Quantum Dynamics and Entropy in a Single-Cooper-Pair Box with a Single-Mode Cavity Field

International Journal of Modern Physics B ◽

10.1142/s0217979203018570 ◽

2003 ◽

Vol 17 (14) ◽

pp. 2699-2713 ◽

Cited By ~ 3

Author(s):

Meng Zhang ◽

Jian Zou ◽

Bin Shao

Keyword(s):

Mixed State ◽

Pure State ◽

Quantum Dynamics ◽

Cooper Pair ◽

Single Mode ◽

Quantum Entropy ◽

Cavity Field ◽

Cooper Pair Box ◽

Quantized Field ◽

Single Mode Cavity

We consider a single-Cooper-pair box biased by a classical voltage and also irradiated by a single-mode quantized field. We assume that the box is initially in a mixed state, and investigate the quantum dynamics of the Cooper-pair box and show that the collapse and revival phenomenon can exist in this system. We also study the quantum entropy of the single-Cooper-pair box and discuss the effects of the different parameters on this quantum entropy. We find that the box, which is initially in a mixed state, may evolve into an almost pure state.

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Collapse and revival of a single-Cooper-pair box in a single-mode quantized field

Chinese Physics ◽

10.1088/1009-1963/12/6/314 ◽

2003 ◽

Vol 12 (6) ◽

pp. 649-654 ◽

Cited By ~ 2

Author(s):

Yao Yan-Sun ◽

Zou Jian ◽

Shao Bin

Keyword(s):

Cooper Pair ◽

Single Mode ◽

Cooper Pair Box ◽

Quantized Field

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Dynamic behaviour of a single-Cooper-pair box in a single-mode quantized field with dissipation

Chinese Physics ◽

10.1088/1009-1963/11/11/320 ◽

2002 ◽

Vol 11 (11) ◽

pp. 1200-1204 ◽

Cited By ~ 2

Author(s):

Yao Yan-Sun ◽

Zou Jian ◽

Shao Bin

Keyword(s):

Cooper Pair ◽

Dynamic Behaviour ◽

Single Mode ◽

Cooper Pair Box ◽

Quantized Field

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QUANTUM DYNAMICS OF A SINGLE COOPER-PAIR BOX WITH A SINGLE-MODE CAVITY FIELD

International Journal of Modern Physics B ◽

10.1142/s0217979202014978 ◽

2002 ◽

Vol 16 (31) ◽

pp. 4767-4774 ◽

Cited By ~ 16

Author(s):

MENG ZHANG ◽

JIAN ZOU ◽

BIN SHAO

Keyword(s):

Quantum Dynamics ◽

Cooper Pair ◽

Single Mode ◽

Cavity Field ◽

Field Frequency ◽

Cooper Pair Box ◽

Quantized Field ◽

Single Mode Cavity

We consider a single Cooper-pair box biased by a classical voltage and also irradiated by a single-mode quantized field. We investigate the quantum dynamics of the Cooper-pair box and show that the collapse and revival phenomena can exist in this system, which is sensitive to the detuning between the Josephson energy EJ and cavity field frequency ω.

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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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