Work

Quantum metrology using quantum combs and tensor network formalism

Year: 2025

Type: article

Abstract: 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.

Source: New Journal of Physics

DOI: 10.1088/1367-2630/ada8d1

Authors: Stanisław Kurdziałek, Piotr Dulian, Joanna Majsak, Sagnik Chakraborty, Rafał Demkowicz-Dobrzański

Institutions: University of Warsaw, Center for Theoretical Physics, Polish Academy of Sciences, Technology Innovation Institute, Universidad Complutense de Madrid

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,610

Funder: Narodowe Centrum Nauki