Approaching Ideal Weak Link Behavior with Three Dimensional Aluminum Nanobridges

Abstract

We present transport measurements of unshunted dc superconducting quantum interference devices (SQUIDs) consisting of 30 nm wide aluminum nanobridges of varying length L contacted with two and three dimensional banks. 3D nanobridge SQUIDs with L less than or equal to 150 nm (approximately 3-4 times the superconducting coherence length) exhibit approx. 70% critical current modulation with applied magnetic field, approaching the theoretical limit for an ideal short metallic weak link. In contrast, 2D nanobridge SQUIDs exhibit significantly lower critical current modulation. This enhanced nonlinearity makes 3D nanobridge Josephson junctions well suited to optimize sensitivity in weak link SQUID magnetometers as well as realize ultra low-noise amplifiers and qubits.

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Document Details

Document Type
Technical Report
Publication Date
May 10, 2010
Accession Number
ADA524055

Entities

People

  • D. H. Slichter
  • E. M. Levenson-falk
  • I. Siddiqi
  • R. Vijay

Organizations

  • University of California, Berkeley

Tags

DTIC Thesaurus Topics

  • Aluminum
  • Amplifiers
  • Electromagnetic Radiation
  • Electron Beam Lithography
  • Electron Beams
  • Elements
  • Films
  • Geometry
  • Josephson Junctions
  • Low Noise
  • Low Noise Amplifiers
  • Magnetic Fields
  • Magnetometers
  • Measurement
  • Quantum Bits
  • Thin Films
  • Three Dimensional

Fields of Study

  • Physics

Readers

  • Integrated Circuit Design and Technology.
  • International Relations and Conflict Resolution
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.

Technology Areas

  • Quantum Computing
  • Quantum Science - Quantum Dots