Superconducting Qubits for Quantum Computation

Abstract

Superconducting Quantum Interference Devices (SQUIDs) have been studied to determine their suitability for use as qubits in quantum computers. It has been demonstrated, using spectroscopic measurements, that it is possible to place such a SQUID in a coherent superposition of 0 and 1 quantum states as required for use as a qubit. A transformer for the controllable coupling of flux qubits (one of the key components needed for a quantum computer) has been developed. Theoretical techniques for the analysis of experimental, multilevel qubit systems have been developed. Analysis has been done for Aharonov-Casher qubits that allow access to all key variables and for quantum-limited JJ comparator readouts. The theory of linear detection has been extended to quadratic detectors. Our fabrication capability has been upgraded to yield high-quality Nb qubits (less than 1 pA subgap leakage current at 0.3 K) with a 1 week turn around.

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Document Details

Document Type
Technical Report
Publication Date
Nov 30, 2003
Accession Number
ADA422633

Entities

People

  • James Lukens

Organizations

  • State University of New York

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Comparators
  • Computations
  • Computers
  • Couplings
  • Detection
  • Detectors
  • Electron Beam Lithography
  • Fabrication
  • Information Processing
  • Magnetometers
  • Measurement
  • Quantum Computers
  • Quantum Computing
  • Quantum Information
  • Quantum Information Science
  • Quantum Mechanics
  • Scientists

Fields of Study

  • Physics

Readers

  • Computational Modeling and Simulation
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Superconducting Magnet Technology

Technology Areas

  • Quantum Computing
  • Quantum Science - Quantum Dots