Abstract

Previous studies [J. Opt. Soc. Am. B 27, A170 (2010) [CrossRef]  ; J. Appl. Phys. 114, 193102 (2013) [CrossRef]  ] have asserted that a coherent-state Mach–Zehnder interferometer (MZI) with parity-based phase estimation can achieve superresolution at the shot-noise limit (SNL). We show that these studies have ignored the need for repeated measurements in order to achieve root-mean-square accuracy at the SNL. Consequently, their superresolution claims need major revision. For comparison, we present the performance of a coherent-state MZI that uses dual-homodyne detection and show that it can achieve SNL scaling in a single measurement, albeit without superresolution.

© 2017 Optical Society of America

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