Stabilizing two-qubit entanglement by mimicking a squeezed environment

TL;DR

This paper demonstrates that entanglement stabilization of two remote qubits, traditionally achieved with non-classical squeezed environments, can be mimicked using classical temporal modulation, simplifying implementation in quantum systems.

Contribution

It introduces classical modulation schemes to replicate effects of squeezed environments for entanglement stabilization, avoiding the need for non-classical light.

Findings

Classical modulation can mimic squeezed environment effects

Protocols are resilient against imperfections

Trade-offs between speed and quality of entanglement stabilization

Abstract

It is well known that qubits immersed in a squeezed vacuum environment exhibit many exotic phenomena, including dissipative entanglement stabilization. Here, we show that these effects only require interference between excitation and decay processes, and can be faithfully mimicked without non-classical light using simple classical temporal modulation. We present schemes that harnesses this idea to stabilize entanglement between two remote qubits coupled via a transmission line or waveguide, where either the qubit-waveguide coupling is modulated, or the qubits are directly driven. We analyze the resilience of these approaches against various imperfections, and also characterize the trade-off between the speed and quality of entanglement stabilization. Our protocols are compatible with state of the art cavity QED systems.