Incoherent light as a control resource: a route to complete controllability of quantum systems

TL;DR

This paper explores how incoherent light can be used as a resource to achieve complete controllability of quantum systems, enabling transfer between any states using a combination of incoherent and coherent light.

Contribution

It introduces a method that provides a constructive proof for approximate open-loop Markovian state-transfer controllability of quantum systems.

Findings

Demonstrates the theoretical feasibility of controlling quantum states with incoherent light.

Provides a constructive proof for approximate controllability in the space of all density matrices.

Extends the understanding of quantum control using both incoherent and coherent light sources.

Abstract

We discuss the use of incoherent light as a resource to control the atomic dynamics and review the proposed in Phys. Rev. A 84, 042106 (2011) method for a controlled transfer between any pure and mixed states of quantum systems using a combination of incoherent and coherent light. Formally, the method provides a constructive proof for an approximate open-loop Markovian state-transfer controllability of quantum system in the space of all density matrices---the strongest possible degree of quantum state control.