| Issue |
EPL
Volume 136, Number 5, December 2021
|
|
|---|---|---|
| Article Number | 50001 | |
| Number of page(s) | 7 | |
| Section | General | |
| DOI | https://doi.org/10.1209/0295-5075/ac18fa | |
| Published online | 11 March 2022 | |
The universal unambiguous discriminator between two unknown qudit states
1 Quantum Optoelectronics Laboratory, School of Physical Science and Technology, Southwest Jiaotong University Chengdu 610031, China
2 Department of Applied Physics, School of Physical Science and Technology, Southwest Jiaotong University Chengdu 611756, China
(a) taozhou@swjtu.edu.cn (corresponding author)
Received: 19 June 2021
Accepted: 29 July 2021
In this work, the unambiguous discrimination between two unknown states in d-dimensional 
Hilbert space is investigated. To achieve this goal, the Hilbert space of the states is divided into a series of subspaces, where the components of the two states projected in some of these subspaces can be unambiguously distinguished, and then the unambiguous discriminator between two unknown qudit states can be constructed. Moreover, the optimal success probability of the discrimination between two unknown states is obtained and the form of detection operators is given.
© 2022 EPLA
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