Optimal spin-entangled electron-hole pair pump

TL;DR

This paper introduces a nonperturbative theory for generating spin-entangled electron-hole pairs using oscillating potentials, showing that strong potentials can produce one Bell pair every two cycles, thus enabling efficient entangled qubit sources.

Contribution

It presents a nonperturbative theoretical framework for efficient spin-entangled electron-hole pair production using oscillating potentials, surpassing previous weak potential limitations.

Findings

Strong potential oscillations can produce one Bell pair every two cycles.

The entanglement production exceeds previous weak potential limits.

The theory provides a basis for efficient entangled qubit sources.

Abstract

A nonperturbative theory is presented for the creation by an oscillating potential of spin-entangled electron-hole pairs in the Fermi sea. In the weak potential limit, considered earlier by Samuelsson and Buttiker, the entanglement production is much less than one bit per cycle. We demonstrate that a strong potential oscillation can produce an average of one Bell pair per two cycles, making it an efficient source of entangled flying qubits.