Control of open quantum systems dynamics

TL;DR

This paper demonstrates that universal control of open quantum systems can be achieved using only two coherent operations and a simple measurement, enabling arbitrary quantum dynamics through feedback.

Contribution

It introduces a minimal control scheme combining two coherent controls and a basic measurement for universal open-system quantum control.

Findings

Universal control is theoretically achievable with minimal resources.

Repeated application of two coherent controls and a simple measurement suffices.

The approach enables arbitrary open-system quantum dynamics control.

Abstract

We investigate the control resources needed to effect arbitrary quantum dynamics. We show that the ability to perform measurements on a quantum system, combined with the ability to feed back the measurement results via coherent control, allows one to control the system to follow any desired open-system evolution. Such universal control can be achieved, in principle, through the repeated application of only two coherent control operations and a simple ``Yes-No'' measurement.