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20092026
most citedReversing the Weak Quantum Measurement for a Photonic Qubit

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physics.optics2026

Classical Petermann Factor as a Measure of Quantum Squeezing in Photonic Time Crystals

Younsung Kim, Kyungmin Lee, Changhun Oh +3

Photonic time crystals realize a continuum of momentum-resolved SU(1,1) parametric amplifiers. We show that a classical quantity, the Petermann factor of the effective Floquet Bogo…