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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Quantum coherence in a superfluid Josephson junction.

Supradeep Narayana1, Yuki Sato

  • 1The Rowland Institute at Harvard, Harvard University, Cambridge, Massachusetts 02142, USA.

Physical Review Letters
|March 17, 2011
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Summary
This summary is machine-generated.

Researchers applied quantum phase gradients to a superfluid helium-4 Josephson junction array, observing collective coherent behaviors and quantum interference. This work explores phase coherence in superfluid systems.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Superfluidity

Background:

  • Josephson junctions are crucial for studying quantum phenomena.
  • Superfluid helium-4 exhibits unique quantum properties.
  • Controlling phase coherence in nanoscale systems is challenging.

Purpose of the Study:

  • To investigate collective coherent behaviors in a superfluid (4)He Josephson junction array.
  • To explore the effects of applying quantum phase gradients along the array.
  • To understand quantum interference phenomena in this system.

Main Methods:

  • Fabrication of an array of nanoscale apertures forming a Josephson junction.
  • Application of quantum phase gradients directly along the aperture array.
  • Observation and analysis of collective behaviors and quantum interference.

Main Results:

  • Observation of collective coherent behaviors from individual aperture elements.
  • Demonstration of quantum interference resulting from collective behavior.
  • Evidence of phase coherence across the superfluid aperture array.

Conclusions:

  • The experiment demonstrates a new method for studying superfluid quantum phenomena.
  • Results provide insights into phase coherence in nanoscale superfluid systems.
  • Connections are drawn to superconducting and Bose-Einstein condensate Josephson junctions.