Experimental quantification of entanglement through heat capacity

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Publication Details

Output type: Journal article

Author list: Singh H, Chakraborty T, Das D, Jeevan HS, Tokiwa Y, Gegenwart P, Mitra C

Publisher: IOP Publishing

Publication year: 2013

Journal: New Journal of Physics (1367-2630)

Volume number: 15

ISSN: 1367-2630

eISSN: 1367-2630

Languages: English-Great Britain (EN-GB)

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Open access status: gold

Full text URL: https://doi.org/10.1088/1367-2630/15/11/113001

Abstract

A new experimental realization of heat capacity as an entanglement witness is reported. Entanglement properties of a low-dimensional quantum spin system are investigated by heat capacity measurements performed down to very low temperatures (400 mK), for various applied magnetic field values. The experimentally extracted results for the value of heat capacity at zero field matches perfectly with the theoretical estimates of entanglement from model Hamiltonians. The studied sample is a spin half antiferromagnetic system that shows a clear signature of quantum phase transition at very low temperatures when the heat capacity is varied as a function of fields at a fixed temperature. The variation of entanglement as a function of field is then explored in the vicinity of the quantum phase transition to capture the sudden loss of entanglement.

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