Photonic Quantum Receiver Attaining the Helstrom Bound

• URL: http://arxiv.org/abs/2410.21800v1
• Date: Tue, 29 Oct 2024 07:08:39 GMT
• Title: Photonic Quantum Receiver Attaining the Helstrom Bound
• Authors: Aakash Warke, Janis Nötzel, Kan Takase, Warit Asavanant, Hironari Nagayoshi, Kosuke Fukui, Shuntaro Takeda, Akira Furusawa, Peter van Loock,
• Abstract summary: We propose an efficient decomposition scheme for a quantum receiver that attains the Helstrom bound in the low-photon regime for discriminating binary coherent states. We account for realistic conditions by examining the impact of photon loss and imperfect photon detection, including the presence of dark counts. Our scheme motivates testing quantum advantages with cubic-phase gates and designing photonic quantum computers to optimize symbol-by-symbol measurements in optical communication.
• Score: 0.9674145073701151
• License:
• Abstract: We propose an efficient decomposition scheme for a quantum receiver that attains the Helstrom bound in the low-photon regime for discriminating binary coherent states. Our method, which avoids feedback as used in Dolinar's case, breaks down nonlinear operations into basic gates used in continuous-variable quantum computation. We account for realistic conditions by examining the impact of photon loss and imperfect photon detection, including the presence of dark counts, while presenting squeezing as a technique to mitigate these noise sources and maintain the advantage over SQL. Our scheme motivates testing quantum advantages with cubic-phase gates and designing photonic quantum computers to optimize symbol-by-symbol measurements in optical communication.

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