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Related Concept Videos

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
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Cooper pair splitting in parallel quantum dot Josephson junctions.

R S Deacon1, A Oiwa2, J Sailer3

  • 11] Advanced Device Laboratory, RIKEN, Wako 351-0198, Japan [2] Center for Emergent Matter Science (CEMS), RIKEN, Wako 351-0198, Japan.

Nature Communications
|July 2, 2015
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate non-local spin entanglement in electron pairs using quantum dot Josephson junctions. This confirms coherent transport from spatially separated entangled electrons, a key step for quantum technologies.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Information Science
  • Nanotechnology

Background:

  • Entangled electron pairs are crucial for quantum optics and quantum computing.
  • Previous Andreev entanglers showed efficient charge splitting but lacked direct spin entanglement confirmation.
  • Solid-state analogues of entangled photon sources are highly sought after.

Purpose of the Study:

  • To directly confirm spin entanglement in non-local electron pairs generated on-demand.
  • To investigate the feasibility of using quantum dot Josephson junctions for entangled electron transport.
  • To establish a method for generating and detecting spin-entangled electron pairs in a solid-state system.

Main Methods:

  • Fabrication and measurement of parallel quantum dot Josephson junction devices.
  • Observation of Josephson current flow, indicating Cooper pair splitting and recombination.
  • Independent tuning of quantum dots using local electrical gates to study non-local transport.

Main Results:

  • Demonstrated non-dissipative supercurrent flow between spatially separated quantum dots.
  • Confirmed coherent transport of Cooper pairs, evidenced by the Josephson current.
  • Provided direct evidence for spin entanglement by confirming current flow from the entangled pair.

Conclusions:

  • Quantum dot Josephson junctions can generate and transport spin-entangled electron pairs.
  • The observed Josephson current confirms the coherence and non-local nature of the entangled electron transport.
  • This work represents a significant advancement towards solid-state sources of entangled electrons for quantum applications.