Decoherent many-body dynamics of a nano- mechanical resonator coupled to charge qubits

TL;DR

This paper investigates the decoherent dynamics of charge qubits coupled to a nanomechanical resonator, highlighting the persistence of entanglement despite environmental losses and its implications for quantum information processing.

Contribution

It introduces a model of coupled charge qubits and a resonator considering environmental effects, revealing robustness of entanglement and connections to driven XY spin models.

Findings

Entanglement persists for long times despite losses.

Entanglement robustness against temperature variations.

Relevance to quantum information processing and open quantum systems.

Abstract

The dynamics of charge qubits coupled to a nanomechanical resonator under influence of both a phonon bath in contact with the resonator and irreversible decay of the qubits is considered. The focus of our analysis is devoted to multi partite entanglement and the effects arising from the coupling to the reservoir. It is shown that despite losses, entanglement formation may still persist for relatively long times and it is especially robust against temperature dependence of the reservoir. Together with control of system parameters, the system may therefore be especially suited for quantum information processing. Furthermore, our results shed light on the evolution of open quantum many-body systems. For instance, due to intrinsic qubit-qubit couplings our model is related to a driven XY spin model.