Correspondence: Enhancing a phase measurement by sequentially probing a solid state system

J. A. Dunningham; P. A. Knott; W. J. Munro

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Correspondence: Enhancing a phase measurement by sequentially probing a solid state system

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arxiv 1604.06719 v1 pith:C7OC4CG5 submitted 2016-04-22 quant-ph

P. A. Knott , W. J. Munro , J. A. Dunningham This is my paper · ORCID

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In a recent paper, Liu et al. [Nat. Commun. 6:6726 (2015)] claim to perform the first room temperature entanglement-enhanced phase measurement in a solid-state system. We argue here that this claim is incorrect: their measurement is not enhanced because of the entanglement in their system, but instead the enhancement comes from the fact that the phase shift is applied twice to their state.

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