Feedback stabilization of pure states in quantum transport

TL;DR

This paper introduces a feedback control method to generate and stabilize pure quantum states in transport devices like charge qubits, using single electron jump signals to optimize control under non-equilibrium conditions.

Contribution

It presents a novel feedback scheme for stabilizing pure states in quantum transport devices, demonstrated on double quantum dots with phonon dephasing.

Findings

Successful stabilization of pure states in quantum dots.

Full counting statistics effectively guide control optimization.

Robustness against phonon dephasing demonstrated.

Abstract

We propose a feedback control scheme for generating and stabilizing pure states of transport devices, such as charge qubits, under non-equilibrium conditions. The purification of the device state is conditioned on single electron jumps and leaves a clear signal in the full counting statistics which can be used to optimize control parameters. As an example of our control scheme, we are presenting the stabilization pure transport states in a double quantum dot setup with the inclusion of phonon dephasing.