2003/11/28 by Andrew N. Jordan, Markus Buttiker
Physics and Astronomy · #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevlett.92.247901
published as Phys. Rev. Lett. 92, 247901 (2004) · 4 pages, 2 figures
arxiv created 2003/11/28 · arxiv updated 2009/12/01
We show how many-body ground state entanglement information may be extracted from sub-system energy measurements at zero temperature. Generically, the larger the measured energy fluctuations are, the larger the entanglement is. Examples are given with the two-state system and the harmonic oscillator. Comparisons made with recent qubit experiments show this type of measurement provides another method to quantify entanglement with the environment.