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

I V Borzenets¹, Y Shimazaki¹, G F Jones²

¹Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.

Scientific Reports

|March 15, 2016

Summary

Researchers developed a high-efficiency graphene Cooper pair splitter for quantum information processing. This superconductor-based device demonstrates significant advancements in generating and manipulating entangled electrons in solid-state systems.

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Area of Science:

Quantum Mechanics
Solid-State Physics
Quantum Information Processing

Background:

Quantum entangled electrons are crucial for quantum information processing but challenging to realize in solid-state systems.
Superconductor-two quantum dot Cooper pair splitters are promising but face scalability and manipulation limitations in nanowire designs.

Purpose of the Study:

To demonstrate an optimized, high-efficiency graphene-based Cooper pair splitter.
To overcome the limitations of previous nanowire-based devices for generating and manipulating entangled electrons.

Main Methods:

Utilized Chemical Vapor Deposition (CVD) grown graphene.
Engineered the device to induce superconductivity in graphene via the proximity effect.
Designed the device to minimize parasitic capacitance and output channel separation.

Main Results:

Achieved a large superconducting gap (Δ = 0.5 meV) and coherence length (ξ = 200 nm).
Measured high quantum entanglement properties, including up to 86% visibility and 62% splitting efficiency.
The device's flat nature increased charging energy (EC) and eased geometric restrictions.

Conclusions:

The developed graphene Cooper pair splitter offers a scalable and efficient platform for quantum information processing.
This advancement paves the way for near-unity efficiencies, long-distance entangled electron splitting, and post-splitting electron manipulation.
The device design represents a significant step towards practical solid-state quantum information technologies.