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Violating Bell inequality using weak coherent states

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Abstract

We present an experimental investigation of two-photon interference using a continuous-wave laser. We demonstrate the violation of the Clauser–Horne–Shimony–Holt (CHSH) inequality using the phase-randomized weak coherent states from a continuous-wave laser. Our implementation serves as an approach to reveal the quantum nature of a state that is considered to be a classical state.

© 2021 Optical Society of America

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Data Availability

Data underlying the results presented in this Letter are not publicly available at this time but may be obtained from the authors upon reasonable request.

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