Activation of indistinguishability-based quantum coherence for enhanced metrological applications with particle statistics imprint

Sun, Kai; Liu, Zheng-Hao; Wang, Yan; Hao, Ze-Yan; Xu, Xiao-Ye; Xu, Jin-Shi; Li, Chuan-Feng; Guo, Guang-Can; Castellini, Alessia; Lami, Ludovico; Winter, Andreas; Adesso, Gerardo; Compagno, Giuseppe; Lo Franco, Rosario

Abstract

Quantum coherence, an essential feature of quantum mechanics allowing quantum superposition of states, is a resource for quantum information processing. Coherence emerges in a fundamentally different way for nonidentical and identical particles. For the latter, a unique contribution exists linked to indistinguishability that cannot occur for nonidentical particles. Here, we experimentally demonstrate this additional contribution to quantum coherence with an optical setup, showing that its amount directly depends on the degree of indistinguishability, and exploiting it in a quantum phase discrimination protocol. Furthermore, the designed setup allows for simulating fermionic particles with photons, thus assessing the role of exchange statistics in coherence generation and utilization. Our experiment proves that independent indistinguishable particles can offer a controllable resource of coherence and entanglement for quantum-enhanced metrology.

Citation

Sun, K., Liu, Z.-H., Wang, Y., Hao, Z.-Y., Xu, X.-Y., Xu, J.-S., Li, C.-F., Guo, G.-C., Castellini, A., Lami, L., Winter, A., Adesso, G., Compagno, G., & Lo Franco, R. (2022). Activation of indistinguishability-based quantum coherence for enhanced metrological applications with particle statistics imprint. Proceedings of the National Academy of Sciences, 119(21), Article e2119765119. https://doi.org/10.1073/pnas.211976511

• Journal Article Type: Article
• Acceptance Date: Mar 29, 2022
• Online Publication Date: May 20, 2022
• Publication Date: May 24, 2022
• Deposit Date: Mar 31, 2022
• Publicly Available Date: May 26, 2022
• Journal: Proceedings of the National Academy of Sciences
• Print ISSN: 0027-8424
• Publisher: National Academy of Sciences
• Peer Reviewed: Peer Reviewed
• Volume: 119
• Issue: 21
• Article Number: e2119765119
• DOI: https://doi.org/10.1073/pnas.211976511
• Public URL: https://nottingham-repository.worktribe.com/output/7680811
• Publisher URL: https://www.pnas.org/doi/full/10.1073/pnas.2119765119