dorsal/arxiv
View SchemaSteady state entanglement in open and noisy quantum systems at high temperature
| Authors | L. Hartmann, W. Dür, H. -J. Briegel |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0512219 |
| URL | https://arxiv.org/abs/quant-ph/0512219 |
| DOI | 10.1103/PhysRevA.74.052304 |
| Journal | Phys. Rev. A. 74, 052304 (2006). |
Abstract
We show that quantum mechanical entanglement can prevail even in noisy open quantum systems at high temperature and far from thermodynamical equilibrium, despite the deteriorating effect of decoherence. The system consists of a number N of interacting quantum particles, and it can interact and exchange particles with some environment. The effect of decoherence is counteracted by a simple mechanism, where system particles are randomly reset to some standard initial state, e.g. by replacing them with particles from the environment. We present a master equation that describes this process, which we can solve analytically for small N. If we vary the interaction strength and the reset against decoherence rate, we find a threshold below which the equilibrium state is classically correlated, and above which there is a parameter region with genuine entanglement.
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"abstract": "We show that quantum mechanical entanglement can prevail even in noisy open\nquantum systems at high temperature and far from thermodynamical equilibrium,\ndespite the deteriorating effect of decoherence. The system consists of a\nnumber N of interacting quantum particles, and it can interact and exchange\nparticles with some environment. The effect of decoherence is counteracted by a\nsimple mechanism, where system particles are randomly reset to some standard\ninitial state, e.g. by replacing them with particles from the environment. We\npresent a master equation that describes this process, which we can solve\nanalytically for small N. If we vary the interaction strength and the reset\nagainst decoherence rate, we find a threshold below which the equilibrium state\nis classically correlated, and above which there is a parameter region with\ngenuine entanglement.",
"arxiv_id": "quant-ph/0512219",
"authors": [
"L. Hartmann",
"W. D\u00fcr",
"H. -J. Briegel"
],
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"quant-ph"
],
"doi": "10.1103/PhysRevA.74.052304",
"journal_ref": "Phys. Rev. A. 74, 052304 (2006).",
"title": "Steady state entanglement in open and noisy quantum systems at high temperature",
"url": "https://arxiv.org/abs/quant-ph/0512219"
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