Figure 1. A patterned HOM interferometer is placed in contact with an external environment. |𝑝₁⟩ and |𝑝₂⟩ representing the quantum state of photon-1 and photon-2 before entering the HOM interferometer, 𝜇 and 𝛿 representing the position and momentum translation in the quadratures of respective photons. BS is a 50:50 beam splitter, environmental interaction is represented by the state vector |𝜖⟩, and A and B are the photon coincidence detectors

From

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

Simanshu Kumar, Nandan S Bisht

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