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- Title
Qubit state discrimination using post-measurement information.
- Authors
Ha, Donghoon; Kim, Jeong San; Kwon, Younghun
- Abstract
We consider the optimal discrimination of nonorthogonal qubit states with post-measurement information and provide an analytic structure of the optimal measurements. We also show that there is always a null optimal measurement when post-measurement information is given. Further, in discriminating four states using post-measurement information, we analytically provide the optimal probability of correct guessing and show that the uniqueness of optimal measurement is equivalent to the non-existence of non-null optimal measurement with post-measurement information.
- Subjects
QUBITS; INFORMATION measurement; QUANTUM states
- Publication
Quantum Information Processing, 2022, Vol 21, Issue 2, p1
- ISSN
1570-0755
- Publication type
Article
- DOI
10.1007/s11128-022-03414-y