Quantum State Discrimination Using the Minimum Average Number of Copies

In the task of discriminating between nonorthogonal quantum states from multiple copies, the key parameters are the error probability and the resources (number of copies) used. Previous studies have considered the task of minimizing the average error probability for fixed resources. Here we introduc...

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Bibliographic Details
Published in:Physical review letters 2017-01, Vol.118 (3), p.030502-030502, Article 030502
Main Authors: Slussarenko, Sergei, Weston, Morgan M, Li, Jun-Gang, Campbell, Nicholas, Wiseman, Howard M, Pryde, Geoff J
Format: Article
Language:English
Subjects:
Discrimination
Error analysis
Errors
Optimization
Parameters
Strategy
Tasks
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Summary:In the task of discriminating between nonorthogonal quantum states from multiple copies, the key parameters are the error probability and the resources (number of copies) used. Previous studies have considered the task of minimizing the average error probability for fixed resources. Here we introduce a new state discrimination task: minimizing the average resources for a fixed admissible error probability. We show that this new task is not performed optimally by previously known strategies, and derive and experimentally test a detection scheme that performs better.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.118.030502