Direct Characterization of Quantum Dynamics with Noisy Ancilla

TL;DR

This paper introduces a method for directly characterizing quantum dynamics in noisy environments using error detection codes, improving accuracy of quantum process characterization with practical experimental feasibility.

Contribution

The authors develop a novel DCQD approach that discriminates errors in noisy quantum systems using concatenated error detection codes, enhancing characterization accuracy.

Findings

Effective noise filtering depends on code distance.

Method improves quantum process accuracy.

Applicable to composite amplitude damping and depolarizing noise.

Abstract

We present methods for the direct characterization of quantum dynamics (DCQD) in which both the principal and ancilla systems undergo noisy processes. Using a concatenated error detection code, we discriminate between located and unlocated errors on the principal system in what amounts to filtering of ancilla noise. The example of composite noise involving amplitude damping and depolarizing channels is used to demonstrate the method, while we find the rate of noise filtering is more generally dependent on code distance. Our results indicate the accuracy of quantum process characterization can be greatly improved while remaining within reach of current experimental capabilities.