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Related Experiment Video

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Hysteresis in a quantized superfluid 'atomtronic' circuit.

Stephen Eckel¹, Jeffrey G Lee¹, Fred Jendrzejewski¹

¹Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland, Gaithersburg, Maryland 20899, USA.

|February 14, 2014

Summary

This summary is machine-generated.

Researchers observed hysteresis in superfluid Bose-Einstein condensates for the first time, a phenomenon crucial for atomtronics devices. This finding bridges a gap between theory and experiment, paving the way for new quantum technologies.

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Area of Science:

Atomtronics
Quantum physics
Condensed matter physics

Background:

Atomtronics is an emerging field using ultracold atoms in circuits analogous to electronic devices.
Hysteresis is fundamental in electronics and superconductivity but had not been observed in superfluid Bose-Einstein condensates.
Previous observations of hysteresis in superfluids lacked quantized flow or were indirect.

Purpose of the Study:

To directly detect and characterize hysteresis in superfluid Bose-Einstein condensates.
To investigate the role of excitations and dissipation in superfluid hysteresis.
To explore the potential of controlled hysteresis in atomtronic devices.

Main Methods:

Fabrication of an atomtronic circuit with a superfluid Bose-Einstein condensate ring.
Introduction of a rotating weak link to obstruct superfluid flow.
Direct detection of hysteresis between quantized circulation states.

Main Results:

Direct observation of hysteresis between quantized circulation states in a superfluid Bose-Einstein condensate.
Demonstration of tunable hysteresis loop size.
Identification of vortices as key excitations and confirmation of dissipation's role.

Conclusions:

Hysteresis is now experimentally confirmed in superfluid Bose-Einstein condensates.
Controlled hysteresis in atomtronics circuits could enable novel quantum devices.
This work bridges a critical gap in understanding superfluid dynamics and atomtronics.