Entanglement Generation and Stabilization by Coherent Collisions

TL;DR

This paper demonstrates how repeated electron collisions can generate and stabilize entanglement between remote spin qubits through dissipative processes, even amid decoherence, with potential experimental realization.

Contribution

It introduces a collisional framework for entanglement generation and stabilization via coherent electron collisions, including conditions for steady-state entanglement.

Findings

Repeated collisions can drive remote spins into entanglement.

Proper local driving induces a stable entangled steady state.

Entanglement persists despite decoherence if collision rate is high enough.

Abstract

Collision is a useful tool for revealing quantum effects and realizing quantum informational tasks. We demonstrate that repeated collisions by itinerant electrons can dissipatively drive two remote spin qubits into an entangled state in a generic collisional framework. A coherent spin exchange with either qubit facilitates entanglement generation. When combined with proper local driving, these collisions induce an entangled steady state in most collision configurations. Particularly, the collision which is symmetric for the two qubits results in a unique steady state close to a maximally entangled state. Due to the dissipative nature of the process, the entanglement persists in the presence of decoherence, provided the collision frequency exceeds the decoherence rate. Our model can be experimentally implemented using single-electron sources.