Hybrid discrimination strategy based on photon-number-resolving detectors and mesoscopic twin-beam states

• URL: http://arxiv.org/abs/2506.10160v1
• Date: Wed, 11 Jun 2025 20:26:45 GMT
• Title: Hybrid discrimination strategy based on photon-number-resolving detectors and mesoscopic twin-beam states
• Authors: Luca Razzoli, Alex Pozzoli, Alessia Allevi,
• Abstract summary: State discrimination is a key challenge in the implementation of quantum communication protocols.<n>We propose a hybrid strategy that operates in the mesoscopic intensity regime, leveraging robust quantum states of light.<n>Our approach combines classical and quantum features: reliable state discrimination based on a classical property of light, and security stemming from nonclassical correlations.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: State discrimination is a key challenge in the implementation of quantum communication protocols. Most optical communication protocols rely on either coherent states of light or fragile single-photon states, making it often difficult to achieve robustness and security simultaneously. In this work, we propose a hybrid strategy that operates in the mesoscopic intensity regime, leveraging robust quantum states of light. Our approach combines classical and quantum features: reliable state discrimination based on a classical property of light, and security stemming from nonclassical correlations. Specifically, the receiver uses photon-number-resolving detectors to access the mean photon number of the binary thermal signals encoding the information. The communication channel exploits twin-beam states, inherently sensitive to eavesdropping attacks, to provide a layer of security. This strategy is scalable, allowing for straightforward extension to more complex signal alphabets, and offers a promising route for robust and secure quantum communication in the mesoscopic intensity domain.

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