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Related Experiment Video

Updated: Jan 23, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Coherent quantum phase slip.

O V Astafiev¹, L B Ioffe, S Kafanov

¹NEC Green Innovation Research Laboratories, 34 Miyukigaoka, Tsukuba, Ibaraki, 305-8501, Japan. astf@zb.jp.nec.com

|April 21, 2012

Summary

This summary is machine-generated.

Scientists observed coherent quantum phase slip (CQPS), a century-old prediction, in disordered indium oxide. This phenomenon, dual to the Josephson effect, opens new avenues for superconducting electronics and quantum metrology.

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Area of Science:

Condensed Matter Physics
Quantum Mechanics

Background:

Superconductivity, discovered a century ago, has a key prediction, coherent quantum phase slip (CQPS), that remained experimentally unverified.
CQPS is theoretically dual to the Josephson effect, involving coherent flux transfer, unlike previously observed incoherent phase slips.

Purpose of the Study:

To experimentally demonstrate coherent quantum phase slip (CQPS), a fundamental prediction of superconductivity theory.
To overcome experimental challenges posed by quasiparticle dissipation in achieving CQPS observation.

Main Methods:

Utilized strongly disordered indium oxide superconductors near the superconductor-insulator transition.
Investigated a narrow segment of a superconducting loop to observe CQPS.

Main Results:

Directly observed coherent quantum phase slip (CQPS) for the first time.
The effect was manifested through the superposition of quantum states with varying numbers of flux quanta.

Conclusions:

The experimental demonstration of CQPS, analogous to the Josephson effect, is a significant advancement.
This observation is expected to drive new applications in superconducting electronics and quantum metrology.