Control of state and state entanglement with a single auxiliary subsystem

TL;DR

This paper introduces a new quantum control strategy using a single auxiliary subsystem to manipulate the state and entanglement of a quantum system, enabling state preservation and entanglement control.

Contribution

It proposes a novel protocol leveraging a single auxiliary subsystem for quantum state and entanglement control, which was not previously demonstrated.

Findings

Effective state preservation demonstrated

Controlled entanglement degree achieved

Single auxiliary subsystem suffices for control

Abstract

We present a strategy to control the evolution of a quantum system. The novel aspect of this protocol is the use of a \emph{single auxiliary subsystem}. Two applications are given, one which allows for state preservation and another which controls the degree of entanglement of a given initial state.