Quantum cryptography integrating an optical quantum memory

• URL: http://arxiv.org/abs/2504.00094v1
• Date: Mon, 31 Mar 2025 18:00:04 GMT
• Title: Quantum cryptography integrating an optical quantum memory
• Authors: H. Mamann, T. Nieddu, F. Hoffet, M. Bozzio, F. Garreau de Loubresse, I. Kerenidis, E. Diamanti, A. Urvoy, J. Laurat,
• Abstract summary: Developments in scalable quantum networks rely critically on optical quantum memories.<n>We present the first demonstration of a cryptography protocol incorporating an intermediate quantum memory layer.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Developments in scalable quantum networks rely critically on optical quantum memories, which are key components enabling the storage of quantum information. These memories play a pivotal role for entanglement distribution and long-distance quantum communication, with remarkable advances achieved in this context. However, optical memories have broader applications, and their storage and buffering capabilities can benefit a wide range of future quantum technologies. Here we present the first demonstration of a cryptography protocol incorporating an intermediate quantum memory layer. Specifically, we implement Wiesner's unforgeable quantum money primitive with a storage step, rather than as an on-the-fly procedure. This protocol imposes stringent requirements on storage efficiency and noise level to reach a secure regime. We demonstrate the implementation with polarization encoding of weak coherent states of light and a high-efficiency cold-atom-based quantum memory, and validate the full scheme. Our results showcase a major capability, opening new avenues for quantum memory utilization and network functionalities.

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