Non-equilibrium Entanglement and Noise in Coupled Qubits

Abstract

We study charge entanglement in two Coulomb-coupled double quantum dots in thermal equilibrium and under stationary non-equilibrium transport conditions. In the transport regime, the entanglement exhibits a clear switching threshold and various limits due to suppression of tunneling by Quantum Zeno localisation or by an interaction induced energy gap. We also calculate quantum noise spectra and discuss the inter-dot current correlation as an indicator of the entanglement in transport experiments.

4 pages, 4 figures

References in corpus (3)

• Full counting statistics of super-Poissonian shot noise in multi-level quantum dots
• Full counting statistics of nano-electromechanical systems
• Shot noise spectrum of superradiant entangled excitons

Cited by in corpus (8)

• Counting Statistics of Non-Markovian Quantum Stochastic Processes
• Detecting quantum-coherent nanomechanical oscillations using the current-noise spectrum of a double quantum dot
• Electron Bunching in Stacks of Coupled Quantum Dots
• Stochastic resonance phenomena in spin chains
• Measuring the Entanglement between Double Quantum Dot Charge Qubits
• Quantum dynamics in nonequilibrium environments
• Vibrational Coherences in Nano-Elastic Tunneling
• Electrostatic control of quantum dot entanglement induced by coupling to external reservoirs