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

P. A. Knott, W. J. Munro & J. A. Dunningham

Nature Communications

In a recent paper, Liu et al. 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, instead the enhancement comes from the fact that the phase shift is applied twice to their state.

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