Experimental quantum phase discrimination enhanced by controllable indistinguishability-based coherence
Abstract
Quantum coherence, a basic feature of quantum mechanics residing in superpositions of quantum states, is a resource for quantum information processing. Coherence emerges in a fundamentally different way for nonidentical and identical particles, in that for the latter a unique contribution exists linked to indistinguishability which cannot occur for nonidentical particles. We experimentally demonstrate by an optical setup this additional contribution to quantum coherence, showing that its amount directly depends on the degree of indistinguishability and exploiting it to run a quantum phase discrimination protocol. Furthermore, the designed setup allows for simulating Fermionic particles with photons, thus assessing the role of particle statistics (Bosons or Fermions) in coherence generation and utilization. Our experiment proves that independent indistinguishable particles can supply a controllable resource of coherence for quantum metrology.
Cite
@article{arxiv.2103.14802,
title = {Experimental quantum phase discrimination enhanced by controllable indistinguishability-based coherence},
author = {Kai Sun and Zheng-Hao Liu and Yan Wang and Ze-Yan Hao and Xiao-Ye Xu and Jin-Shi Xu and Chuan-Feng Li and Guang-Can Guo and Alessia Castellini and Ludovico Lami and Andreas Winter and Gerardo Adesso and Giuseppe Compagno and Rosario Lo Franco},
journal= {arXiv preprint arXiv:2103.14802},
year = {2022}
}
Comments
6 pages, 4 figures