Entanglement degradation in the solid state: interplay of adiabatic and quantum noise

TL;DR

This paper analyzes how entanglement between two solid-state qubits degrades under realistic noise conditions, revealing the distinct impacts of adiabatic and quantum noise on entanglement dynamics.

Contribution

It provides an analytic expression for concurrence under adiabatic noise and explores the combined effects of broadband noise on entanglement in solid-state qubits.

Findings

Adiabatic noise causes entanglement reduction similar to pure dephasing.

Quantum noise leads to finite-time entanglement loss depending on the state.

Analytic formulas for concurrence under realistic noise spectra are derived.

Abstract

We study entanglement degradation of two non-interacting qubits subject to independent baths with broadband spectra typical of solid state nanodevices. We obtain the analytic form of the concurrence in the presence of adiabatic noise for classes of entangled initial states presently achievable in experiments. We find that adiabatic (low frequency) noise affects entanglement reduction analogously to pure dephasing noise. Due to quantum (high frequency) noise, entanglement is totally lost in a state-dependent finite time. The possibility to implement on-chip both local and entangling operations is briefly discussed.