Theory of Symmetry-Protected Two-Photon Coherence

• URL: http://arxiv.org/abs/2504.04680v1
• Date: Mon, 07 Apr 2025 02:22:38 GMT
• Title: Theory of Symmetry-Protected Two-Photon Coherence
• Authors: Xuanying Lai, Shengwang Du, Yue Jiang,
• Abstract summary: Coherence time of degenerate entangled photon pairs (biphotons) generated via backward spontaneous four-wave mixing was shown to be immune to optical loss and dephasing.<n>This finding is crucial for practical applications in quantum information processing, quantum communication, and networking.
• Score: 6.792369821047859
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In a recent article [Phys. Rev. Lett. 133, 033601 (2024)], the coherence time of degenerate entangled photon pairs (biphotons) generated via backward spontaneous four-wave mixing in a cold atomic ensemble was shown to be immune to optical loss and dephasing. This finding is crucial for practical applications in quantum information processing, quantum communication, and networking, where loss is inevitable. However, the underlying mechanism for this loss- and dephasing-insensitive biphoton coherence time was insufficiently studied in the previous article, as quantum noise was not taken into account. In this work, we employ the Heisenberg-Langevin approach to study this effect and provide a rigorous theoretical proof of the symmetry-protected biphoton coherence by taking quantum noise into consideration, as compared to the perturbation theory in the interaction picture.

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