Noise limits on two-photon interferometric sensing

• URL: http://arxiv.org/abs/2106.13671v2
• Date: Wed, 25 Aug 2021 16:53:35 GMT
• Title: Noise limits on two-photon interferometric sensing
• Authors: Hannah Scott, Dominic Branford, Niclas Westerberg, Jonathan Leach, Erik M. Gauger
• Abstract summary: Delay between the arms of the two-photon Hong-Ou-Mandel interferometer directly affects the relative inability of the photon pair, affecting the rate of recorded coincidences. We investigate what degree of noise Mach-Zehnder interferometry retains its edge over Hong-Ou-Mandel interferometry.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: When a photon interferes with itself while traversing a Mach-Zehnder inteferometer, the output port where it emerges is influenced by the phase difference between the interferometer arms. This allows for highly precise estimation of the path length difference (delay) but is extremely sensitive to phase noise. By contrast, a delay between the arms of the two-photon Hong-Ou-Mandel interferometer directly affects the relative indistinguishability of the photon pair, affecting the rate of recorded coincidences. This likewise allows for delay estimation; notably less precise but with the advantage of being less sensitive to perturbations of the photons' phase. Focusing on two-photon input states, we here investigate to what degree of noise Mach-Zehnder interferometry retains its edge over Hong-Ou-Mandel interferometry. We also explore the competing benefits of different two-photon inputs for a Mach-Zehnder interferometer, and under what parameter regimes each input performs best.

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