Discriminating single-photon states unambiguously in high dimensions

Agnew, M., Bolduc, E., Resch, K. J., Franke-Arnold, S. and Leach, J. (2014) Discriminating single-photon states unambiguously in high dimensions. Physical Review Letters, 113, 020501. (doi:10.1103/PhysRevLett.113.020501) (PMID:25062151)

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Abstract

The ability to uniquely identify a quantum state is integral to quantum science, but for nonorthogonal states, quantum mechanics precludes deterministic, error-free discrimination. However, using the nondeterministic protocol of unambiguous state discrimination enables the error-free differentiation of states, at the cost of a lower frequency of success. We discriminate experimentally between nonorthogonal, high-dimensional states encoded in single photons; our results range from dimension d=2 to d=14. We quantify the performance of our method by comparing the total measured error rate to the theoretical rate predicted by minimum-error state discrimination. For the chosen states, we find a lower error rate by more than 1 standard deviation for dimensions up to d=12. This method will find immediate application in high-dimensional implementations of quantum information protocols, such as quantum cryptography.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Franke-Arnold, Dr Sonja
Authors: Agnew, M., Bolduc, E., Resch, K. J., Franke-Arnold, S., and Leach, J.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1079-7114

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