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Practical quantum metrology with large precision gains in the low photon number regime

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posted on 2023-06-09, 00:47 authored by P A Knott, T J Proctor, A J Hayes, James Cooling, Jacob DunninghamJacob Dunningham
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 shot noise limit, for low photon numbers. Motivated by practicality we then look at the squeezed cat-state, which has recently been made experimentally, and shows further precision gains over the shot noise limit and a 3-fold improvement in the QFI over the optimal Gaussian state. We present a conceptually simple measurement scheme that saturates the QFI, and we demonstrate a robustness to loss for small photon numbers. The squeezed cat-state can therefore give a significant precision enhancement in optical quantum metrology in practical and realistic conditions.

History

Publication status

  • Published

File Version

  • Accepted version

Journal

Physical Review A

ISSN

2469-9926

Publisher

American Physical Society

Issue

3

Volume

93

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2016-06-23

First Open Access (FOA) Date

2016-06-23

First Compliant Deposit (FCD) Date

2016-06-23

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