Quantum-Limited Symbol-Blind Channel Estimation for Coherent State Discrimination

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 $4N_s\mathbf{C}$, 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.

Quantum Physics (quant-ph); Signal Processing (eess.SP)

arXiv:2607.24644 [quant-ph]

(or arXiv:2607.24644v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2607.24644 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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