Perfect squeezing by damping modulation in circuit quantum electrodynamics

TL;DR

This paper demonstrates that modulating the damping rate of a microwave resonator in circuit QED can generate perfect vacuum squeezing, leveraging dissipation for quantum state engineering with potential for qubit-dependent control.

Contribution

It introduces a novel damping modulation technique to achieve perfect squeezing in circuit QED systems, expanding quantum state engineering capabilities.

Findings

Damping modulation produces arbitrary squeezing strength.

The method enables perfect vacuum squeezing.

Qubit-dependent squeezing is achievable.

Abstract

Dissipation-driven quantum state engineering uses the environment to steer the state of quantum systems and preserve quantum coherence in the steady state. We show that modulating the damping rate of a microwave resonator generates a vacuum squeezed state of arbitrary squeezing strength, thereby constituting a mechanism allowing perfect squeezing. Given the recent experimental realizations in circuit QED of a microwave resonator with a tunable damping rate [Yin et al., Phys. Rev. Lett. 110, 107001 (2013)], superconducting circuits are an ideal playground to implement this technique. By dispersively coupling a qubit to the microwave resonator, it is possible to obtain qubit-state dependent squeezing.