High Efficiency CVD Graphene-lead (Pb) Cooper Pair Splitter.

Abstract:

:Generation and manipulation of quantum entangled electrons is an important concept in quantum mechanics, and necessary for advances in quantum information processing; but not yet established in solid state systems. A promising device is a superconductor-two quantum dots Cooper pair splitter. Early nanowire based devices, while efficient, are limited in scalability and further electron manipulation. We demonstrate an optimized, high efficiency, CVD grown graphene-based Cooper pair splitter. Our device is designed to induce superconductivity in graphene via the proximity effect, resulting in both a large superconducting gap Δ = 0.5 meV, and coherence length ξ = 200 nm. The flat nature of the device lowers parasitic capacitance, increasing charging energy EC. Our design also eases geometric restrictions and minimizes output channel separation. As a result we measure a visibility of up to 86% and a splitting efficiency of up to 62%. This will pave the way towards near unity efficiencies, long distance splitting, and post-splitting electron manipulation.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Borzenets IV,Shimazaki Y,Jones GF,Craciun MF,Russo S,Yamamoto M,Tarucha S

doi

10.1038/srep23051

subject

Has Abstract

pub_date

2016-03-14 00:00:00

pages

23051

issn

2045-2322

pii

srep23051

journal_volume

6

pub_type

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