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Power of Sequential Protocols in Hidden Quantum Channel Discrimination
Sho Sugiura1,2, Arkopal Dutt3, William J Munro4,5
1Physics and Informatics Laboratory, NTT Research, Inc., 940 Stewart Drive, Sunnyvale, California, 94085, USA.
Physical Review Letters
|July 1, 2024
Summary
Sequential quantum channel discrimination (QCD) protocols perfectly identify unknown quantum channels acting on hidden systems. Other methods fail, highlighting sequential approaches as superior for realistic quantum experiments.
Area of Science:
- Quantum Information Science
- Quantum Control and Measurement
Background:
- Many systems involve unknown quantum channels interacting with inaccessible subsystems.
- Learning these hidden quantum channels requires indirect methods via interacting controllable subsystems.
Purpose of the Study:
- To investigate quantum channel discrimination (QCD) under constraints of hidden systems.
- To compare the efficacy of different protocols for hidden system QCD.
Main Methods:
- Analysis of sequential, depth-1 parallel, and multishot protocols for hidden system QCD.
- Theoretical investigation of discrimination capabilities and performance limits.
Main Results:
- Sequential protocols achieve perfect discrimination of hidden quantum channels.
- Sequential protocols saturate the Heisenberg limit, indicating optimal precision.
- Depth-1 parallel and multishot protocols are insufficient for solving hidden system QCD.
Conclusions:
- Sequential protocols demonstrate superior performance for hidden system quantum channel discrimination.
- The findings suggest sequential strategies are more practical for experimental quantum information processing.
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