Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevA.80.013825
Title: Quantum phase estimation with lossy interferometers
Authors: Demkowicz-Dobrzanski, R.
Dorner, U.
Smith, B.J. 
Lundeen, J.S.
Wasilewski, W.
Banaszek, K.
Walmsley, I.A.
Issue Date: 6-Aug-2009
Source: Demkowicz-Dobrzanski, R., Dorner, U., Smith, B.J., Lundeen, J.S., Wasilewski, W., Banaszek, K., Walmsley, I.A. (2009-08-06). Quantum phase estimation with lossy interferometers. Physical Review A - Atomic, Molecular, and Optical Physics 80 (1) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevA.80.013825
Abstract: We give a detailed discussion of optimal quantum states for optical two-mode interferometry in the presence of photon losses. We derive analytical formulae for the precision of phase estimation obtainable using quantum states of light with a definite photon number and prove that maximization of the precision is a convex optimization problem. The corresponding optimal precision, i.e., the lowest possible uncertainty, is shown to beat the standard quantum limit thus outperforming classical interferometry. Furthermore, we discuss more general inputs: states with indefinite photon number and states with photons distributed between distinguishable time bins. We prove that neither of these is helpful in improving phase estimation precision. © 2009 The American Physical Society.
Source Title: Physical Review A - Atomic, Molecular, and Optical Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/130048
ISSN: 10502947
DOI: 10.1103/PhysRevA.80.013825
Appears in Collections:Staff Publications

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