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New Journal of Physics

Simulation of Bell states with incoherent thermal light

Hui Chen, Tao Peng, Sanjit Karmakar, Yanhua H. Shih

Published Aug 12, 2011• 14 citations
Publisher

Abstract

This paper reports our experimental study of thermal light multi-photon qubits. Taking advantage of two-photon interference, we have successfully observed Bell-type correlation from mutually incoherent and orthogonally polarized thermal fields. The visibilities of the polarization correlation and the temporal anti-correlation both exceed 71%, indicating the behavior of a two-photon Bell state or a two-digit qubit.

DOI
10.1088/1367-2630/13/8/083018

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This paper reports our experimental study of thermal light multi-photon qubits. Taking advantage of two-photon interference, we have successfully observed Bell-type correlation from mutually incoherent and orthogonally polarized thermal fields. The visibilities of the polarization correlation and the temporal anti-correlation both exceed 71%, indicating the behavior of a two-photon Bell state or a two-digit qubit.
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We propose an incoherent interferometer which can partly modify the spatial correlation property of thermal light. Applying the interferometer to the two-photon double-slit interference with thermal light, we find that the subwavelength interference patterns appear in the intensity correlation not only between two same polarized photons at different positions but also between two orthogonally polarized photons at the same position. The latter can correspond to the two-photon double-slit interference using a two-photon entangled source. Our experimental result suggests that a thermal light source is capable of accomplishing subwavelength lithography technique to surpass the Rayleigh resolution limit.