Paul Knott

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Recently, there have been significant developments in entanglement-based quantum metrology. However, entanglement is fragile against experimental imperfections, and quantum sensing to beat the standard quantum limit in scaling has not yet been achieved in realistic systems. Here, we show that it is possible to overcome such restrictions so that one can(More)
In a recent paper, Liu et al. 1 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(More)
Quantum metrology exploits quantum correlations to make precise measurements with limited particle numbers. By utilizing inter-and intra-mode correlations in an optical interferometer, we find a state that combines entanglement and squeezing to give a 7-fold enhancement in the quantum Fisher information (QFI) – a metric related to the precision – over the(More)
The HTML version of this Correspondence was previously published with an incomplete title and incorrect Article number. This has now been corrected in the HTML; the PDF version of the paper was correct from the time of publication. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material(More)
Quantum mechanics allows entanglement enhanced measurements to be performed, but loss remains an obstacle in constructing realistic quantum metrology schemes. However, recent work has revealed that entangled coherent states (ECSs) have the potential to perform robust subclassical measurements [J. Joo et al., Phys. Rev. Lett. 107, 083601 (2011)]. Up to now(More)
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