Steering-enhanced quantum metrology using superpositions of noisy phase shifts

TL;DR

This paper demonstrates that superpositions of noisy phase shifts, manipulated via quantum steering, can suppress noise effects and enhance quantum metrology, supported by theoretical analysis and proof-of-principle experiments on IBM Quantum.

Contribution

It extends steering-enhanced quantum metrology to superpositions of noisy phase shifts, showing noise suppression and metrology improvement with experimental validation.

Findings

Superpositions of noisy phase shifts improve measurement precision.

Experimental proof-of-principle on IBM Quantum confirms theoretical predictions.

Superpositions can mitigate noise effects in quantum metrology.

Abstract

Quantum steering is an important correlation in quantum information theory. A recent work [Nat. Commun. 12, 2410 (2021)] showed that quantum steering is also useful for quantum metrology. Here, we extend the exploration of steering-enhanced quantum metrology from single noiseless phase shifts to superpositions of noisy phase shifts. As concrete examples, we consider a control system that manipulates a target system to pass through a superposition of either dephased or depolarized phase shifts channels. We show that using such superpositions of noisy phase shifts can suppress the effects of noise and improve metrology. Furthermore, we also implemented proof-of-principle experiments for a superposition of dephased phase shifts on the IBM Quantum Experience, demonstrating a clear improvement on metrology.