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 |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Franke-Arnold, Professor 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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