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Direct and efficient detection of quantum superposition

Autor(en)
Daniel Kun, Teodor Strömberg, Michele Spagnolo, Borivoje Dakić, Lee A. Rozema, Philip Walther
Abstrakt

One of the most striking quantum phenomena is superposition, where one particle simultaneously inhabits different states. Most methods to verify coherent superposition are indirect, in that they require the distinct states to be recombined. Here, we adapt an xor game, in which a "test"photon is placed in a superposition of two orthogonal spatial modes, and each mode is sent to separated parties who perform local measurements on their modes without reinterfering the original modes. We show that by using a second identical "measurement"photon the parties are nonetheless able to verify if the test photon was placed in coherent superposition of the two spatial modes. We then turn this game into a resource-efficient verification scheme, obtaining a confidence that the particle is superposed which approaches unity exponentially fast. We demonstrate our scheme using a single photon, obtaining a 99% confidence that the particle is superposed with only 37 copies. Our work shows the utility of xor games to verify quantum resources, allowing us to efficiently detect quantum superposition without reinterfering the superposed modes.

Organisation(en)
Quantenoptik, Quantennanophysik und Quanteninformation, Forschungsverbund Quantum Aspects of Space Time
Externe Organisation(en)
IST Austria - Institute of Science and Technology
Journal
Physical Review A
Band
111
Anzahl der Seiten
6
ISSN
2469-9926
DOI
https://doi.org/10.48550/arXiv.2405.08065
Publikationsdatum
05-2025
Peer-reviewed
Ja
ÖFOS 2012
103025 Quantenmechanik, 103026 Quantenoptik
ASJC Scopus Sachgebiete
Atomic and Molecular Physics, and Optics
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/8f925530-bc59-4737-9531-1d3397583adb