Activation of indistinguishability-based quantum coherence for enhanced metrological applications with particle statistics imprint
Sun, Kai (University of Science and Technology of China)
Liu, Zheng-Hao (University of Science and Technology of China)
Wang, Yan (University of Science and Technology of China)
Hao, Ze-Yan (University of Science and Technology of China)
Xu, Xiao-Ye (University of Science and Technology of China)
Xu, Jin-Shi (University of Science and Technology of China)
Li, Chuan-Feng (University of Science and Technology of China)
Guo, Guang-Can (University of Science and Technology of China)
Castellini, Alessia (Università di Palermo)
Lami, Ludovico (Universität Ulm)
Winter, Andreas (Universitat Autònoma de Barcelona. Departament de Física)
Adesso, Gerardo (University of Nottingham)
Compagno, Giuseppe (Università di Palermo)
Lo Franco, Rosario (Università di Palermo)

Fecha:	2022
Resumen:	Quantum coherence has a fundamentally different origin for nonidentical and identical particles since for the latter a unique contribution exists due to indistinguishability. Here we experimentally show how to exploit, in a controllable fashion, the contribution to quantum coherence stemming from spatial indistinguishability. Our experiment also directly proves, on the same footing, the different role of particle statistics (bosons or fermions) in supplying coherence-enabled advantage for quantum metrology. Ultimately, our results provide insights toward viable quantum-enhanced technologies based on tunable indistinguishability of identical building blocks. 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.
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Identical particles ; Quantum coherence ; Quantum metrology
Publicado en:	Proceedings of the National Academy of Sciences of the United States of America, Vol. 119, Issue 21 (May 2022) , art. e2119765119, ISSN 1091-6490

DOI: 10.1073/pnas.2119765119
PMID: 35594392

7 p, 1.7 MB

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