Quantum coherence marks a deviation from classical physics, and has been studied as a resource for metrology and quantum computation. Finding reliable and effective methods for assessing its presence is then highly desirable. Coherence witnesses rely on measuring observables whose outcomes can guarantee that a state is not diagonal in a known reference basis. Here, we experimentally measure a type of coherence witness that uses pairwise state comparisons to identify superpositions in a basis-independent way. Our experiment uses a single interferometric setup to simultaneously measure the three pairwise overlaps among three single-photon states via Hong-Ou-Mandel tests. Aside from coherence witnesses, we show the measurements also serve as a Hilbert-space dimension witness. Our results attest to the effectiveness of pooling many two-state comparison tests to ascertain various relational properties of a set of quantum states.
Witnesses of coherence and dimension from multiphoton indistinguishability tests / Giordani, Taira; Esposito, Chiara; Hoch, Francesco; Carvacho, Gonzalo; Brod, Daniel J.; Galvão, Ernesto F.; Spagnolo, Nicolò; Sciarrino, Fabio. - In: PHYSICAL REVIEW RESEARCH. - ISSN 2643-1564. - 3:2(2021). [10.1103/PhysRevResearch.3.023031]
Witnesses of coherence and dimension from multiphoton indistinguishability tests
Giordani, Taira;Esposito, Chiara;Hoch, Francesco;Carvacho, Gonzalo;Spagnolo, Nicolò;Sciarrino, Fabio
2021
Abstract
Quantum coherence marks a deviation from classical physics, and has been studied as a resource for metrology and quantum computation. Finding reliable and effective methods for assessing its presence is then highly desirable. Coherence witnesses rely on measuring observables whose outcomes can guarantee that a state is not diagonal in a known reference basis. Here, we experimentally measure a type of coherence witness that uses pairwise state comparisons to identify superpositions in a basis-independent way. Our experiment uses a single interferometric setup to simultaneously measure the three pairwise overlaps among three single-photon states via Hong-Ou-Mandel tests. Aside from coherence witnesses, we show the measurements also serve as a Hilbert-space dimension witness. Our results attest to the effectiveness of pooling many two-state comparison tests to ascertain various relational properties of a set of quantum states.File | Dimensione | Formato | |
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