Quantum interferometry with and without an external phase reference
Marcin Jarzyna, Rafal Demkowicz-Dobrzanski
TL;DR
This paper examines the importance of external phase references in quantum interferometry, clarifies misconceptions about quantum Fisher information usage, and provides correct methodologies for phase estimation with or without external references.
Contribution
It offers a clear analysis of quantum interferometry schemes and resolves inconsistencies in the literature regarding the application of quantum Fisher information.
Findings
Identifies inconsistencies in previous literature.
Provides a correct framework for using QFI in phase estimation.
Clarifies the role of external phase references in quantum interferometry.
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.
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