dorsal/arxiv
View SchemaPerspectives for a mixed two-qubit system with binomial quantum states
| Authors | Mahmoud Abdel-Aty |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0504223 |
| URL | https://arxiv.org/abs/quant-ph/0504223 |
| DOI | 10.1088/1464-4266/6/4/003 |
| Journal | J Opt B Quantum Semiclass Opt 6, 201 (2004) |
Abstract
The problem of the relationship between entanglement and two-qubit systems in which it is embedded is central to the quantum information theory. This paper suggests that the concurrence hierarchy as an entanglement measure provides an alternative view of how to think about this problem. We consider mixed states of two qubits and obtain an exact solution of the time-dependent master equation that describes the evolution of two two-level qubits (or atoms) within a perfect cavity for the case of multiphoton transition. We consider the situation for which the field may start from a binomial state. Employing this solution, the significant features of the entanglement when a second qubit is weakly coupled to the field and becomes entangled with the first qubit, is investigated. We also describe the response of the atomic system as it varies between the Rabi oscillations and the collapse-revival mode and investigate the atomic inversion and the Q-function. We identify and numerically demonstrate the region of parameters where significantly large entanglement can be obtained. Most interestingly, it is shown that features of the entanglement is influenced significantly when the multi-photon process is involved. Finally, we obtain illustrative examples of some novel aspects of this system and show how the off-resonant case can sensitize entanglement to the role of initial state setting.
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"abstract": "The problem of the relationship between entanglement and two-qubit systems in\nwhich it is embedded is central to the quantum information theory. This paper\nsuggests that the concurrence hierarchy as an entanglement measure provides an\nalternative view of how to think about this problem. We consider mixed states\nof two qubits and obtain an exact solution of the time-dependent master\nequation that describes the evolution of two two-level qubits (or atoms) within\na perfect cavity for the case of multiphoton transition. We consider the\nsituation for which the field may start from a binomial state. Employing this\nsolution, the significant features of the entanglement when a second qubit is\nweakly coupled to the field and becomes entangled with the first qubit, is\ninvestigated. We also describe the response of the atomic system as it varies\nbetween the Rabi oscillations and the collapse-revival mode and investigate the\natomic inversion and the Q-function. We identify and numerically demonstrate\nthe region of parameters where significantly large entanglement can be\nobtained. Most interestingly, it is shown that features of the entanglement is\ninfluenced significantly when the multi-photon process is involved. Finally, we\nobtain illustrative examples of some novel aspects of this system and show how\nthe off-resonant case can sensitize entanglement to the role of initial state\nsetting.",
"arxiv_id": "quant-ph/0504223",
"authors": [
"Mahmoud Abdel-Aty"
],
"categories": [
"quant-ph"
],
"doi": "10.1088/1464-4266/6/4/003",
"journal_ref": "J Opt B Quantum Semiclass Opt 6, 201 (2004)",
"title": "Perspectives for a mixed two-qubit system with binomial quantum states",
"url": "https://arxiv.org/abs/quant-ph/0504223"
},
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