Low-Loss Materials for Josephson Qubits

Abstract

I review progress at UCSB on understanding the physics of decoherence in superconducting qubits. Although many decoherence mechanisms were studied and fixed in the last 5 years, the most important ones are two-level state defects in amorphous dielectrics, nonequilibrium quasiparticles generated from stray infrared light, and radiation to slotline modes. With improved design, the performance of integrated circuit transmons using the Xmon design are now close to world record performance: these devices have the advantage of retaining coherence when scaled up to 9 qubits.

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Document Details

Document Type
Technical Report
Publication Date
Oct 09, 2014
Accession Number
ADA622764

Entities

People

  • Andrew Cleland
  • Chris Palmstrom
  • John Martinis
  • Robert Mcdermott

Organizations

  • University of California, Santa Barbara

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Abstracts
  • Accuracy
  • Circuits
  • Dielectrics
  • Electrical Circuits
  • Integrated Circuits
  • Low Temperature
  • Materials
  • Quantum Bits
  • Quantum Circuits
  • Quantum Computers
  • Quantum Computing
  • Quantum Information
  • Quantum Information Science
  • Quasiparticles
  • Radiation
  • Reliability

Fields of Study

  • Physics

Readers

  • Microwave Engineering.
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.

Technology Areas

  • Quantum Science - Quantum Dots