Steady-State Tunable Entanglement Thermal Machine Using Quantum Dots

TL;DR

This paper proposes a solid-state quantum dot thermal machine that generates steady-state entanglement between distant spins, controllable by voltages and temperature gradients, with potential for perfect Bell-pair generation.

Contribution

It introduces a feasible quantum dot device that creates steady-state entanglement and functions as an entanglement thermal machine under various control parameters.

Findings

Device operates over a large voltage range.

Entanglement can be generated at zero voltage bias.

Post-selection scheme can produce perfect Bell-pairs.

Abstract

We present a solid state thermal machine based on quantum dots to generate steady-state entanglement between distant spins. Unlike previous approaches our system is controlled by experimentally feasible steady state currents manipulated by dc voltages. By analyzing the Liouvillian eigenspectrum as a function of the control parameters, we show that our device operates over a large voltage region. As an extension, the proposed device also works as an entanglement thermal machine under a temperature gradient that can even give rise to entanglement at zero voltage bias. Finally, we highlight a post-selection scheme based on currently feasible non-demolition measurement techniques that can generate perfect Bell-pairs from the steady state output of our thermal machine.