Squeezed_Entangled_PRA_3-Accepted.pdf (677 kB)
Practical quantum metrology with large precision gains in the low photon number regime
journal contribution
posted on 2023-06-09, 00:47 authored by P A Knott, T J Proctor, A J Hayes, James Cooling, Jacob DunninghamJacob DunninghamQuantum 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 AISSN
2469-9926Publisher
American Physical SocietyExternal DOI
Issue
3Volume
93Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2016-06-23First Open Access (FOA) Date
2016-06-23First Compliant Deposit (FCD) Date
2016-06-23Usage metrics
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