Tonekaboni, Behnam, Haine, Simon A and Szigeti, Stuart S (2015) Heisenberg-limited metrology with a squeezed vacuum state, three-mode mixing, and information recycling. Physical Review A, 91 (3). p. 3616. ISSN 1050-2947

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Abstract

We have previously shown that quantum-enhanced atom interferometry can be achieved by mapping the quantum state of squeezed optical vacuum to one of the atomic inputs via a beamsplitter-like process [Phys. Rev. A 90, 063630 (2014)]. Here we ask the question: is a better phase sensitivity possible if the quantum state transfer (QST) is described by a three-mode-mixing model, rather than a beamsplitter? The answer is yes, but only if the portion of the optical state not transferred to the atoms is incorporated via information recycling. Surprisingly, our scheme gives a better sensitivity for lower QST efficiencies and with a sufficiently large degree of squeezing can attain near-Heisenberg-limited sensitivities for arbitrarily small QST efficiencies. Furthermore, we use the quantum Fisher information to demonstrate the near optimality of our scheme.

Item Type:	Article
Schools and Departments:	School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups:	Atomic, Molecular and Optical Physics Research Group
Subjects:	Q Science > QC Physics
Depositing User:	Richard Chambers
Date Deposited:	12 Jan 2017 13:26
Last Modified:	06 Mar 2017 05:04
URI:	http://srodev.sussex.ac.uk/id/eprint/66130

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