Knott, P A, Proctor, T J, Hayes, A J, Cooling, J P and Dunningham, J A (2016) Practical quantum metrology with large precision gains in the low photon number regime. Physical Review A, 93 (3). ISSN 2469-9926
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Abstract
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.
Item Type: | Article |
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Schools and Departments: | School of Mathematical and Physical Sciences > Physics and Astronomy |
Subjects: | Q Science > QC Physics |
Depositing User: | Richard Chambers |
Date Deposited: | 23 Jun 2016 10:30 |
Last Modified: | 06 Aug 2019 11:01 |
URI: | http://sro.sussex.ac.uk/id/eprint/60337 |
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