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Updated: Jan 9, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Quantum-Enhanced Quickest Change Detection of Transmission Loss
Saikat Guha1,2, Tiju Cherian John2,3, Zihao Gong1
1University of Maryland, College Park, Department of Electrical and Computer Engineering, Maryland 20742, USA.
None:
Augmenting a train of bright phase-modulated laser-light pulses of a coherent communications system with infinitesimally small quantum photons per pulse-entangled across several time bins-prepared by splitting squeezed light in a temporal-mode interferometer can dramatically enhance a homodyne receiver's ability to detect a sudden change in the channel loss, by up to a factor that is the inverse of the pre-change loss, without affecting the communications rate. We discuss the quantum limit of quickest change detection, and the problem of joint communications and change detection that our Letter opens up.
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