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quant-ph2026
From Classical to Quantum Channels: Achieving Positive Covert Rates
Hassan ZivariFard, Xiaodong Wang, Alexei Ashikhmin
In this paper, we study the conditions under which covert communication at positive rates is feasible over discrete memoryless classical, classical-quantum, and quantum channels. F…
quant-ph2023★ 2 cited
Record Photon Information Efficiency with Optical Clock Transmission and Recovery of 12.5 bits/photon over an Optical Channel with 77 dB Loss
René-Jean Essiambre, Cheng Guo, Sai Kanth Dacha +18
We experimentally demonstrate optical detection at 12.5~bits per incident photon, 9.4~dB higher than the theoretical limit of conventional coherent detection. A single laser transm…