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Parameter Estimation with Entangled Photons Produced by Parametric Down-ConversionWe explore the advantages offered by twin light beams produced in parametric down-conversion for precision measurement. The symmetry of these bipartite quantum states, even under losses, suggests that monitoring correlations between the divergent beams permits a high-precision inference of any symmetry-breaking effect, e.g., fiber birefringence. We show that the quantity of entanglement is not the key feature for such an instrument. In a lossless setting, scaling of precision at the ultimate "Heisenberg" limit is possible with photon counting alone. Even as photon losses approach 100% the precision is shot-noise limited, and we identify the crossover point between quantum and classical precision as a function of detected flux. The predicted hypersensitivity is demonstrated with a Bayesian simulation.
Document ID
20110008170
Acquisition Source
Ames Research Center
Document Type
Reprint (Version printed in journal)
Authors
Cable, Hugo
(National Univ. of Singapore Singapore)
Durkin, Gabriel A.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 25, 2013
Publication Date
July 2, 2010
Publication Information
Publication: Physical Review Letters
Subject Category
Optics
Report/Patent Number
ARC-E-DAA-TN1933
Funding Number(s)
CONTRACT_GRANT: NNA08CG83C
Distribution Limits
Public
Copyright
Other

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