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arXiv quant-ph/0512181quant-ph
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用温度计探测纠缠

Detecting entanglement with a thermometer

Janet Anders, Dagomir Kaszlikowski, Christian Lunkes, Toshio Ohshima, Vlatko Vedral

摘要:

我们提出了一个一般性的论点,表明温度以及其他物理状态变量可以作为纠缠证人的空间纠缠。这适用于各种系统,我们使用简单的自由非相互作用玻色子气体来验证我们的想法。我们发现纠缠可以在任意高的温度下存在,前提是我们可以探测越来越小的空间区域。然后,我们讨论了玻色-爱因斯坦凝聚的发生和我们的纠缠存在的条件之间的关系,并比较各自的临界温度。最后,我们简短地讨论了将纠缠视为量子系统中的宏观性质的想法,以及它与一般相变的可能关系。

英文摘要:

We present a general argument showing that the temperature as well as other thermodynamical state variables can qualify as entanglement witnesses for spatial entanglement. This holds for a variety of systems and we exemplify our ideas using a simple free non-interacting Bosonic gas. We find that entanglement can exist at arbitrarily high temperatures, provided that we can probe smaller and smaller regions of space. We then discuss the relationship between the occurrence of Bose-Einstein condensation and our conditions for the presence of entanglement and compare the respective critical temperatures. We close with a short discussion of the idea of seeing entanglement as a macroscopic property in thermodynamical systems and its possible relation to phase transitions in general.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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