Tunable entanglement generation for mobile-electron spin qubits

TL;DR

This paper demonstrates how tunable Rashba spin splitting in electronic Mach-Zehnder interferometers enables controllable, nondeterministic entanglement generation between electron spin qubits, advancing quantum information processing capabilities.

Contribution

It introduces a method to electrically control entanglement production in electron interferometers using Rashba spin splitting, providing a tunable and switchable entangler.

Findings

Spin-dependent interference enables entanglement generation.

Adjusting spin-precession length switches entanglement on/off.

Electric-field tuning controls the form of entangled states.

Abstract

Recent studies have shown that linear electron optics can be used to generate entangled two-particle states from nonentangled ones if additional measurements of charge or parity are performed. We have investigated such nondeterministic entanglement production in electronic versions of the Mach-Zehnder interferometer, where spin-dependent interference occurs due to the presence of electric-field tunable Rashba spin splitting. Adjustment of the spin-precession length turns out to switch the entangler on and off, as well as control the detailed form of entangled output states.