Quantum-Limited Symbol-Blind Channel Estimation for Coherent State Discrimination
Hongxu Chen, Renzhi Yuan, Haifeng Yao, Mugen Peng
Abstract
Residual dispersion breaks temporal-mode matching in photon-starved coherent links. For equiprobable M-ary PSK coherent states in a known spectral mode, with unknown symbols and carrier phase, we establish the quantum limit for blind joint estimation of group delay and second-order dispersion: after eliminating the common phase, it is 4NsC, set by the covariance of the centered generators alone. A multi-output quantum pulse gate with photon-number-resolving detection locally attains it and supports reception below the standard quantum limit under turbulent fading.
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