Quantum interferometry with and without an external phase reference

Abstract

We discuss the role of an external phase reference in quantum interferometry. We point out inconsistencies in the literature with regard to the use of the quantum Fisher information (QFI) in phase estimation interferometric schemes. We discuss the interferometric schemes with and without an external phase reference and show a proper way to use QFI in both situations.

4 pages, 2 figures (formulas corrected, conclusions unchanged)

References in corpus (6)

• General framework for estimating the ultimate precision limit in noisy quantum-enhanced metrology
• Optimal Quantum Phase Estimation
• Mach-Zehnder Interferometry at the Heisenberg Limit with coherent and squeezed-vacuum light
• Phase estimation without a priori knowledge in the presence of loss
• All path-symmetric pure states achieve their maximal phase sensitivity in conventional two-path interferometry
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