Dynamic Cooper Pair Splitter

TL;DR

This paper proposes a dynamic Cooper pair splitter that produces a regular, noiseless flow of spin-entangled electrons by tuning quantum dot energy levels, enabling improved quantum information processing.

Contribution

It introduces a method to control Cooper pair splitting dynamically, achieving synchronized, noiseless entangled electron flow with optimal conditions for one pair per cycle.

Findings

Identified optimal conditions for noiseless, synchronized splitting.

Analyzed the $g^{(2)}$-function and waiting time distribution.

Feasible with current technology for quantum information applications.

Abstract

Cooper pair splitters are promising candidates for generating spin-entangled electrons. However, the splitting of Cooper pairs is a random and noisy process, which hinders further synchronized operations on the entangled electrons. To circumvent this problem, we here propose and analyze a dynamic Cooper pair splitter that produces a noiseless and regular flow of spin-entangled electrons. The Cooper pair splitter is based on a superconductor coupled to quantum dots, whose energy levels are tuned in and out of resonance to control the splitting process. We identify the optimal operating conditions for which exactly one Cooper pair is split per period of the external drive and the flow of entangled electrons becomes noiseless. To characterize the regularity of the Cooper pair splitter in the time domain, we analyze the $g^{(2)}$-function of the output currents and the distribution of waiting times between split Cooper pairs. Our proposal is feasible using current technology, and it paves the way for dynamic quantum information processing with spin-entangled electrons.