Keywords :
Bosonic modes; Communications networks; Continuous variables; Discrete variables; Encodings; Mitigation strategy; Mode mixing; Quantum Information; Scalings; Signal fidelity; Computer Science (miscellaneous); Statistical and Nonlinear Physics; Computer Networks and Communications; Computational Theory and Mathematics
Abstract :
[en] We address the challenge of crosstalk in quantum multiplexing–an obstacle to scaling throughput in quantum communication networks. Crosstalk arises when physically coupled quantum modes interfere, degrading signal fidelity. We propose a mitigation strategy based on encoding discrete-variable (DV) quantum information into continuous-variable (CV) bosonic modes using Gottesman-Kitaev-Preskill (GKP) codes. By analyzing the effect of mode-mixing interference, we show that under specific noise strength conditions, the interaction can be absorbed into a gauge subsystem that leaves the logical content intact. We provide rigorous conditions for perfect transmission in the ideal case, derive the structure of the output codes and prove the existence of a gauge-fixing decoder enabling recovery of the logical information. Numerical simulations under displacement Gaussian noise illustrate the fidelity behavior and rate-fidelity tradeoff. Our results establish a coding-theoretic foundation for crosstalk-resilient multiplexing in quantum networks.
Funding text :
This work was supported by the project Lux4QCI (GA 101091508) funded by the Digital Europe Program, and the project LUQCIA Funded by the European Union \u2013 Next Generation EU, with the collaboration of the Department of Media, Connectivity and Digital Policy of the Luxembourgish Government in the framework of the RRF program.
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