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Long-range Cooper pair splitter with high entanglement production rate

Cooper pairs in the superconductor are a natural source of spin entanglement. The existing proposals of the Cooper pair splitter can only realize a low efficiency of entanglement production, and its size is constrained by the superconducting coherence length. Here we show that a long-range Cooper pa... Full description

Journal Title: Scientific reports 05 January 2015, Vol.5, pp.7607
Main Author: Chen, Wei
Other Authors: Shi, D N , Xing, D Y
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 2045-2322 ; PMID: 25556521 Version:1 ; DOI: 10.1038/srep07607
Link: http://pubmed.gov/25556521
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recordid: medline25556521
title: Long-range Cooper pair splitter with high entanglement production rate
format: Article
creator:
  • Chen, Wei
  • Shi, D N
  • Xing, D Y
subjects:
  • Condensed Matter - Mesoscale And Nanoscale Physics
  • Condensed Matter - Superconductivity
  • Quantum Physics
ispartof: Scientific reports, 05 January 2015, Vol.5, pp.7607
description: Cooper pairs in the superconductor are a natural source of spin entanglement. The existing proposals of the Cooper pair splitter can only realize a low efficiency of entanglement production, and its size is constrained by the superconducting coherence length. Here we show that a long-range Cooper pair splitter can be implemented in a normal metal-superconductor-normal metal (NSN) junction by driving a supercurrent in the S. The supercurrent results in a band gap modification of the S, which significantly enhances the crossed Andreev reflection (CAR) of the NSN junction and simultaneously quenches its elastic cotunneling. Therefore, a high entanglement production rate close to its saturation value can be achieved by the inverse CAR. Interestingly, in addition to the conventional entangled electron states between opposite energy levels, novel entangled states with equal energy can also be induced in our proposal.
language: eng
source:
identifier: E-ISSN: 2045-2322 ; PMID: 25556521 Version:1 ; DOI: 10.1038/srep07607
fulltext: fulltext
issn:
  • 20452322
  • 2045-2322
url: Link


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descriptionCooper pairs in the superconductor are a natural source of spin entanglement. The existing proposals of the Cooper pair splitter can only realize a low efficiency of entanglement production, and its size is constrained by the superconducting coherence length. Here we show that a long-range Cooper pair splitter can be implemented in a normal metal-superconductor-normal metal (NSN) junction by driving a supercurrent in the S. The supercurrent results in a band gap modification of the S, which significantly enhances the crossed Andreev reflection (CAR) of the NSN junction and simultaneously quenches its elastic cotunneling. Therefore, a high entanglement production rate close to its saturation value can be achieved by the inverse CAR. Interestingly, in addition to the conventional entangled electron states between opposite energy levels, novel entangled states with equal energy can also be induced in our proposal.
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titleLong-range Cooper pair splitter with high entanglement production rate
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abstractCooper pairs in the superconductor are a natural source of spin entanglement. The existing proposals of the Cooper pair splitter can only realize a low efficiency of entanglement production, and its size is constrained by the superconducting coherence length. Here we show that a long-range Cooper pair splitter can be implemented in a normal metal-superconductor-normal metal (NSN) junction by driving a supercurrent in the S. The supercurrent results in a band gap modification of the S, which significantly enhances the crossed Andreev reflection (CAR) of the NSN junction and simultaneously quenches its elastic cotunneling. Therefore, a high entanglement production rate close to its saturation value can be achieved by the inverse CAR. Interestingly, in addition to the conventional entangled electron states between opposite energy levels, novel entangled states with equal energy can also be induced in our proposal.
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