Remarks about Bell-nonclassicality of a single photon

Editorial Material Physics, Multidisciplinary

Comment on 'Single particle nonlocality with completely independent reference states'

Tamoghna Das et al.

Summary: This comment critiques the claim of violating local realism through correlations between homodyne detectors induced by a single photon, pointing out a calculational mistake as the reason for the claim's error. As this result serves as the basis for other claims in the paper, they are also unsubstantiated.

NEW JOURNAL OF PHYSICS (2022)

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Article Physics, Multidisciplinary

Wave-particle complementarity: detecting violation of local realism with photon-number resolving weak-field homodyne measurements

Tamoghna Das et al.

Summary: Researchers have used weak-field homodyne measurements to demonstrate correlations between optical fields and Bell nonclassicality, but found that standard methods lack the complementarity needed to confirm this nonclassicality. By toggling the local oscillators on or off, a full complementarity between wave aspects and particle number can be achieved, leading to clear violations of local realism in experiments (a) and (b). Such setups may have applications in device-independent quantum protocols.

NEW JOURNAL OF PHYSICS (2022)

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Article Physics, Multidisciplinary

Can single photon excitation of two spatially separated modes lead to a violation of Bell inequality via weak-field homodyne measurements?

Tamoghna Das et al.

Summary: The article discusses experimental schemes using all-optical weak homodyne measurements to reveal the nonclassicality of a single photon. It compares the schemes proposed by Tan et al and Hardy, and investigates the differences between them. It identifies that the nonclassicality in a Hardy-like setup is related to the varying strength of the local oscillators.

NEW JOURNAL OF PHYSICS (2021)

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Article Optics