Figure 7. The figure depicts the Wigner distribution of decoherence that occurred in a Schrödinger cat state of two photons when the photons impinge with a slight change in position 𝛿 and the momentum variables 𝜇 of the photons before interacting with the external environment including the beam splitter in HOM interferometer with variable decoherence time (a) 𝜏 = 0 ps, (b) 𝜏 = 0.2 ps, (c) 𝜏 = 0.4 ps, and (d) 𝜏 = 0.6 ps. It is straightforward to see the contours of the interference vanish with the decoherence time

From

Analyzing the Decoherence on Biphoton and Schrödinger Cat States through Wigner Function

Simanshu Kumar, Nandan S Bisht

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