On detecting violation of local realism with photon-number resolving weak-field homodyne measurements

• URL: http://arxiv.org/abs/2104.10703v1
• Date: Wed, 21 Apr 2021 18:02:25 GMT
• Title: On detecting violation of local realism with photon-number resolving weak-field homodyne measurements
• Authors: Tamoghna Das, Marcin Karczewski, Antonio Mandarino, Marcin Markiewicz, Bianka Woloncewicz, and Marek \.Zukowski
• Abstract summary: Local hidden variables (LHV) model for a phenomenon benchmarks its use in device-independent quantum protocols. Some claims that we can have no LHV models for experiments on excitation of a pair of spatial modes by a single photon are unfounded.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Non-existence of a local hidden variables (LHV) model for a phenomenon benchmarks its use in device-independent quantum protocols. Nowadays photon-number resolving weak-field homodyne measurements allow realization of emblematic gedanken experiments. Alas, claims that we can have no LHV models for such experiments on (a) excitation of a pair of spatial modes by a single photon, and (b) two spatial modes in a weakly squeezed vacuum state, involving constant local oscillator strengths, are unfounded. For (a) an exact LHV model resolves the dispute on the "non-locality of a single photon" in its original formulation. It is measurements with local oscillators on or off that do not have LHV models.

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