Enhancement of sudden death of entanglement for driven qubits

TL;DR

This paper investigates how continuous driving affects the sudden death of entanglement in two qubits, revealing that driving accelerates entanglement decay by introducing additional noise sources, with implications for superconducting qubit systems.

Contribution

It demonstrates that driving induces an effective bath with extra noise sources, leading to faster entanglement sudden death, supported by numerical calculations and potential experimental applications.

Findings

Driving shortens entanglement lifetime due to added noise.

Effective bath includes transverse, thermal squeezed, and longitudinal noise.

Numerical verification confirms the accelerated sudden death phenomenon.

Abstract

We study the recently discovered phenomena of sudden death of entanglement for a system of two qubits, each of them independently longitudinally damped by a reservoir and subjected to a continuous driving. We show that driving produces, in the interaction picture, an effective bath that has elements amounting to various extra sources of noise (transverse, thermal squeezed, thermal longitudinal). As a result, the time of sudden death decreases due to driving, which we verify as well by direct numerical calculation. We suggest that this phenomenon can be studied systematically using superconducting qubits driven by microwave fields.