Attaining subclassical metrology in lossy systems with entangled coherent states

Knott, P A, Munro, W J and Dunningham, J A (2014) Attaining subclassical metrology in lossy systems with entangled coherent states. Physical Review A, 89. 053812. ISSN 1050-2947

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Abstract

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 no read-out scheme has been devised that exploits this robust nature of ECSs, but we present here an experimentally accessible method of achieving precision close to the theoretical bound, even with loss.We show substantial improvements over unentangled classical states and highly entangled NOON states for a wide range of loss values, elevating quantum metrology to a realizable technology in the near future.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics > QC0170 Atomic physics. Constitution and properties of matter Including molecular physics, relativity, quantum theory, and solid state physics
Depositing User: Jacob Dunningham
Date Deposited: 18 May 2014 09:51
Last Modified: 22 Mar 2017 16:49
URI: http://sro.sussex.ac.uk/id/eprint/48715

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