dorsal/arxiv
View SchemaEntanglement and its dynamics in open, dissipative systems
| Authors | L. Hartmann, W. Dür, H. -J. Briegel |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0703138 |
| URL | https://arxiv.org/abs/quant-ph/0703138 |
| DOI | 10.1088/1367-2630/9/7/230 |
| Journal | New J. Phys. 9, 230 (2007) |
Abstract
Quantum mechanical entanglement can exist in noisy open quantum systems at high temperature. A simple mechanism, where system particles are randomly reset to some standard initial state, can counteract the deteriorating effect of decoherence, resulting in an entangled steady state far from thermodynamical equilibrium. We present models for both gas-type systems and for strongly coupled systems. We point out in which way the entanglement resulting from such a reset mechanism is different from the entanglement that one can find in thermal states. We develop master equations to describe the system and its interaction with an environment, study toy models with two particles (qubits), where the master equation can often be solved analytically, and finally examine larger systems with possibly fluctuating particle numbers. We find that in gas-type systems, the reset mechanism can produce an entangled steady state for an arbitrary temperature of the environment, while this is not true in strongly coupled systems. But even then, the temperature range where one can find entangled steady states is typically much higher with the reset mechanism.
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"abstract": "Quantum mechanical entanglement can exist in noisy open quantum systems at\nhigh temperature. A simple mechanism, where system particles are randomly reset\nto some standard initial state, can counteract the deteriorating effect of\ndecoherence, resulting in an entangled steady state far from thermodynamical\nequilibrium. We present models for both gas-type systems and for strongly\ncoupled systems. We point out in which way the entanglement resulting from such\na reset mechanism is different from the entanglement that one can find in\nthermal states. We develop master equations to describe the system and its\ninteraction with an environment, study toy models with two particles (qubits),\nwhere the master equation can often be solved analytically, and finally examine\nlarger systems with possibly fluctuating particle numbers. We find that in\ngas-type systems, the reset mechanism can produce an entangled steady state for\nan arbitrary temperature of the environment, while this is not true in strongly\ncoupled systems. But even then, the temperature range where one can find\nentangled steady states is typically much higher with the reset mechanism.",
"arxiv_id": "quant-ph/0703138",
"authors": [
"L. Hartmann",
"W. D\u00fcr",
"H. -J. Briegel"
],
"categories": [
"quant-ph"
],
"doi": "10.1088/1367-2630/9/7/230",
"journal_ref": "New J. Phys. 9, 230 (2007)",
"title": "Entanglement and its dynamics in open, dissipative systems",
"url": "https://arxiv.org/abs/quant-ph/0703138"
},
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