Quantum Information Techniques for Quantum Metrology

TL;DR

This paper reviews how quantum information techniques such as graph states, error correction, and cryptography can enhance quantum metrology, improving measurement precision beyond classical limits.

Contribution

It introduces the integration of quantum information methods into quantum metrology to achieve higher measurement accuracy.

Findings

Quantum resources enable surpassing classical measurement limits.

Graph states and error correction improve robustness of quantum measurements.

Cryptography techniques can secure quantum metrological processes.

Abstract

Quantum metrology is an auspicious discipline of quantum information which is currently witnessing a surge of experimental breakthroughs and theoretical developments. The main goal of quantum metrology is to estimate unknown parameters as accurately as possible. By using quantum resources as probes, it is possible to attain a measurement precision that would be otherwise impossible using the best classical strategies. For example, with respect to the task of phase estimation, the maximum precision (the Heisenberg limit) is a quadratic gain in precision with respect to the best classical strategies. Of course, quantum metrology is not the sole quantum technology currently undergoing advances. The theme of this thesis is exploring how quantum metrology can be enhanced with other quantum techniques when appropriate, namely: graph states, error correction and cryptography.