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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Updated: Jun 8, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

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

Published on: August 2, 2019

High-coherence hybrid superconducting qubit.

Matthias Steffen1, Shwetank Kumar, David P Divincenzo

  • 1IBM Watson Research Center, Yorktown Heights, New York 10598, USA.

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

We achieved excellent quantum coherence times of 1.5 μs for a novel superconducting qubit. This hybrid design offers a unique single-well potential and reversed nonlinearity for advanced quantum computing applications.

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Last Updated: Jun 8, 2026

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Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Quantum Information Science

Background:

  • Superconducting qubits are leading candidates for quantum computing.
  • Improving qubit coherence times is crucial for scalable quantum computation.
  • Novel qubit designs are needed to overcome limitations of existing architectures.

Purpose of the Study:

  • To report quantum coherence measurements of a novel hybrid superconducting qubit.
  • To characterize the coherence properties and performance of this new qubit design.
  • To explore the potential of this qubit for future quantum information processing.

Main Methods:

  • Fabrication of a hybrid superconducting qubit combining features of existing designs.
  • Quantum coherence measurements to determine relaxation (T1) and dephasing (T2) times.
  • Dispersive readout utilizing a high-Q resonator in a λ/2 configuration.

Main Results:

  • Excellent coherence times were achieved, with T2 approximately equal to T1, reaching 1.5 μs.
  • The qubit exhibits a single-well potential due to a large shunting capacitance and specific junction critical current ratios.
  • A significant nonlinearity with a reversed sign compared to common qubit designs was observed.

Conclusions:

  • The developed hybrid superconducting qubit demonstrates promising coherence properties.
  • The unique design features, including single-well potential and reversed nonlinearity, warrant further investigation.
  • This qubit architecture holds potential for advancing the development of fault-tolerant quantum computers.