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Quantum interference of currents in an atomtronic SQUID.
C Ryu1, E C Samson2,3, M G Boshier2
1Physics Division, Los Alamos National Laboratory, Los Alamos, NM, USA. cryu@lanl.gov.
Nature Communications
|July 5, 2020
Summary
Researchers observed quantum interference of currents in an atomtronic SQUID, analogous to superconducting devices. This opens possibilities for quantum metrology and sensing rotation using atomtronic devices.
Area of Science:
- Quantum physics
- Atomtronics
- Condensed matter physics
Background:
- Superconducting quantum interference devices (SQUIDs) exhibit quantum interference of currents, a key quantum phenomenon.
- Atomtronics offers a new platform for exploring quantum phenomena using neutral atoms.
Purpose of the Study:
- To observe quantum interference of currents in an atomtronic SQUID.
- To investigate the potential of atomtronic SQUIDs for studying SQUID physics and quantum phenomena.
Main Methods:
- Fabrication of an atomtronic SQUID with two junctions.
- Observation of current modulation due to phase differences from rotation.
- Measurement of modulation periods for different radii.
Main Results:
- Quantum interference of currents was successfully observed in the atomtronic SQUID.
- Observed modulation of critical currents showed clear periods consistent with rotation rates.
- Modulation was consistent across three different device radii.
Conclusions:
- The study demonstrates the feasibility of quantum interference in atomtronic SQUIDs.
- Atomtronic SQUIDs can be used to study SQUID physics and macroscopic quantum phenomena.
- This work paves the way for quantum metrology applications, particularly in rotation sensing.
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