Beam splitters do not cause photons to decohere.
Standard linear beam splitters operate via unitary transformations that preserve the phase coherence of photons and are routinely used to generate and manipulate quantum entanglement.
The retrieved literature consistently frames beam splitters as linear, unitary optical elements used to manipulate photon statistics, create quantum entanglement, and preserve phase relationships. None of the standard operational models of beam splitters indicate that they inherently cause photons to decohere; rather, decoherence typically arises from environmental interactions or lossy media outside the ideal beam-splitter operation.
Dmitry Makarov. Theory for the Beam Splitter in Quantum Optics: Quantum Entanglement of Photons and Their Statistics, HOM Effect. 2022. https://doi.org/10.3390/math10244794
Paper [0] outlines standard linear beam splitter theory in quantum optics based on unitary operations like transmission and reflection coefficients, which do not inherently induce photon decoherence.
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Dmitry Makarov, Yuliana Tsykareva. Quantum Entanglement of Monochromatic and Non-Monochromatic Photons on a Waveguide Beam Splitter. 2021. https://doi.org/10.3390/e24010049
Paper [1] demonstrates that waveguide beam splitters actively generate and preserve quantum entanglement between photons rather than destroying their coherence.
Sitotaw Eshete. Observation of Gaussian quantum correlations existence of photons under linear beam splitter. 2022. https://doi.org/10.1088/2399-6528/ac55fa
Paper [9] shows that linear beam splitters preserve and even generate Gaussian quantum correlations and entanglement from input photon states.
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