Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.180402
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Funding
- EU project COMPAS
- MIUR project FIRB [LiCHIS-RBFR10YQ3H]
- ERANET project HIPERCOM
- UK EPSRC [EP/I026436/1]
- Marie Curie contract [PIEF-GA-2009-236345-PROMETEO]
- EPSRC [EP/I026436/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/I026436/1] Funding Source: researchfish
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We address the experimental estimation of Gaussian quantum discord for a two-mode squeezed thermal state, and demonstrate a measurement scheme based on a pair of homodyne detectors assisted by Bayesian analysis, which provides nearly optimal estimation for small value of discord. In addition, though homodyne detection is not optimal for Gaussian discord, the noise ratio to the ultimate quantum limit, as dictated by the quantum Cramer-Rao bound, is limited to about 10 dB.
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