Detecting entanglement with a thermometer
نویسندگان
چکیده
We present a general argument showing that the temperature as well as other thermodynamical state variables qualify as entanglement witnesses for spatial entanglement. This holds for a variety of systems and we exemplify our ideas using a simple 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 close with a short discussion of the relationship between the occurrence of BoseEinstein condensation and our conditions for the presence of entanglement.
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تاریخ انتشار 2005