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Quantum metrology using quantum combs and tensor network formalism
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Journal Article
Quantum metrology using quantum combs and tensor network formalism
2025
Overview
We develop an efficient algorithm for determining optimal adaptive quantum estimation protocols with arbitrary quantum control operations between subsequent uses of a probed channel.We introduce a tensor network representation of an estimation strategy, which drastically reduces the time and memory consumption of the algorithm, and allows us to analyze metrological protocols involving up to
N
= 50 qubit channel uses, whereas the state-of-the-art approaches are limited to
N
< 5. The method is applied to study the performance of the optimal adaptive metrological protocols in presence of various noise types, including correlated noise.
Publisher
IOP Publishing
