A heralded quantum amplifier of multi-photon states

• URL: http://arxiv.org/abs/2505.13992v1
• Date: Tue, 20 May 2025 06:39:38 GMT
• Title: A heralded quantum amplifier of multi-photon states
• Authors: Luis Villegas-Aguilar, Farzad Ghafari, Matthew S. Winnel, Varun B. Verma, Lynden K. Shalm, Timothy C. Ralph, Geoff J. Pryde, Sergei Slussarenko,
• Abstract summary: We experimentally demonstrate a high-fidelity and post-selection-free amplifier for multi-photon states.<n>We achieve heralded amplification of states with up to two photons in a single optical mode, with over a hundredfold intensity gain.<n>Our approach is scalable to higher photon numbers and enables noiseless amplification of complex multi-photon quantum states.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Large-scale quantum networking systems will inevitably require methods to overcome photon loss. While the no-cloning theorem forbids perfect and deterministic amplification of unknown quantum states, probabilistic heralded amplification schemes offer a viable path forward. Yet, for over a decade, successful multi-photon state amplification has remained out of reach, despite the fundamental importance of such states in achieving quantum advantage in optical applications. Here, we experimentally demonstrate a high-fidelity and post-selection-free amplifier for multi-photon states. We achieve heralded amplification of states with up to two photons in a single optical mode, with over a hundredfold intensity gain, and verify the coherence-preserving operation of our scheme. Our approach is scalable to higher photon numbers and enables noiseless amplification of complex multi-photon quantum states, with applications in large-scale quantum communication systems, distributed quantum metrology, and information processing.

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