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Production and Targeting of Monovalent Quantum Dots
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Supercurrent in a Double Quantum Dot.

J C Estrada Saldaña1, A Vekris1, G Steffensen1

  • 1Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark.

Physical Review Letters
|January 5, 2019
PubMed
Summary
This summary is machine-generated.

We observed the Josephson effect in a nanowire double quantum dot, revealing a honeycomb pattern in supercurrent stability. Critical current changes with dot occupation, linked to ground state transitions, confirming a model of interacting quantum dots.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Computing
  • Materials Science

Background:

  • The Josephson effect is a quantum mechanical phenomenon describing the flow of supercurrent between two superconductors separated by a thin insulating barrier.
  • Quantum dots are nanoscale semiconductor structures that can confine electrons, offering potential for quantum information processing.
  • Superconducting leads are essential for enabling quantum phenomena like the Josephson effect in nanoscale devices.

Purpose of the Study:

  • To demonstrate and investigate the Josephson effect in a novel device architecture: a serial double quantum dot in a nanowire with epitaxial superconducting leads.
  • To analyze the supercurrent stability diagram and its relationship with quantum dot occupation and energy level detuning.
  • To validate the experimental device as a realization of the two-impurity Anderson model through comparison with theoretical predictions.

Main Methods:

  • Fabrication of a serial double quantum dot device within a nanowire structure.
  • Integration of epitaxial superconducting leads to facilitate supercurrent flow.
  • Experimental measurement of critical current (I_{c}) as a function of gate voltages controlling dot occupation and energy level detuning.

Main Results:

  • Successful demonstration of the Josephson effect in the engineered nanowire double quantum dot system.
  • Observation of a characteristic honeycomb pattern in the supercurrent stability diagram.
  • Identification of sharp discontinuities in critical current related to doublet-singlet ground state transitions and tuning of I_{c} with detuning, peaking at zero detuning.

Conclusions:

  • The experimental results align with theoretical predictions, confirming the device's fidelity to the two-impurity Anderson model.
  • The study highlights the tunability of critical current via energy level detuning in the double quantum dot system.
  • This work provides a robust platform for exploring fundamental quantum phenomena and advancing quantum technologies.