Physical Resources for Quantum-enhanced Phase Estimation

Abstract

We study the role of quantum entanglement (particle entanglement and mode entanglement) in optical phase estimation by employing the first and second quantization formalisms of quantum mechanics. The quantum Fisher information (QFI) is expressed as a function of the first and second order optical coherence functions. The resulting form of the QFI elucidates the deriving metrological resources for quantum phase estimation: field intensity and photon detection correlations. In addition, our analysis confirms that mode entanglement is not required for quantum-enhanced interferometry, whereas particle entanglement is a necessary requirement.

8 pages, 2 figures, 2 tables

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Cited by in corpus (7)

• Flexible resources for quantum metrology
• Intramode correlations enhanced phase sensitivities in an SU(1,1) interferometer
• Non-asymptotic analysis of quantum metrology protocols beyond the Cramér-Rao bound
• Optimal Gaussian Metrology for Generic Multimode Interferometric Circuit
• Metrological advantage at finite temperature for Gaussian phase estimation
• Non-asymptotic quantum metrology
• The Janus State: A Universal Lower Bound for Second-Order Coherence