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Cooper Pair Splitting in Parallel Quantum Dot Josephson Junctions

Overview
Journal Nat Commun
Specialty Biology
Date 2015 Jul 2
PMID 26130172
Citations 11
Authors
R S Deacon
A Oiwa
J Sailer
S Baba
Y Kanai
K Shibata
K Hirakawa
S Tarucha
Affiliations
Soon will be listed here.
Abstract

Devices to generate on-demand non-local spin entangled electron pairs have potential application as solid-state analogues of the entangled photon sources used in quantum optics. Recently, Andreev entanglers that use two quantum dots as filters to adiabatically split and separate the quasi-particles of Cooper pairs have shown efficient splitting through measurements of the transport charge but the spin entanglement has not been directly confirmed. Here we report measurements on parallel quantum dot Josephson junction devices allowing a Josephson current to flow due to the adiabatic splitting and recombination of the Cooper pair between the dots. The evidence for this non-local transport is confirmed through study of the non-dissipative supercurrent while tuning independently the dots with local electrical gates. As the Josephson current arises only from processes that maintain the coherence, we can confirm that a current flows from the spatially separated entangled pair.

Citing Articles

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Supercurrent and Superconducting Diode Effect in Parallel Double Quantum Dots with Rashba Spin-Orbit Interaction.

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Josephson Diode Effect in Parallel-Coupled Double-Quantum Dots Connected to Unalike Majorana Nanowires.

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Phase-dependent Andreev molecules and superconducting gap closing in coherently-coupled Josephson junctions.

Matsuo S, Imoto T, Yokoyama T, Sato Y, Lindemann T, Gronin S Nat Commun. 2023; 14(1):8271.

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Triplet correlations in Cooper pair splitters realized in a two-dimensional electron gas.

Wang Q, Ten Haaf S, Kulesh I, Xiao D, Thomas C, Manfra M Nat Commun. 2023; 14(1):4876.

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