Coherent Spin Manipulation in an Exchange-Only Qubit

Abstract

Initialization, two-spin coherent manipulation, and readout of a three-spin qubit are demonstrated using a few-electron triple quantum dot. The three-spin qubit is designed to allow all operations for full qubit control to be tuned via nearest-neighbor exchange interaction. Fast readout of charge states takes advantage of multiplexed reflectometry. Decoherence measured in a two-spin subspace is found to be consistent with predictions based on gate voltage noise with a uniform power spectrum. The theory of the exchange-only qubit is developed and it is shown that initialization of only two spins suffices for operation. Requirements for full multiqubit control using only exchange and electrostatic interactions are outlined.

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Document Details

Document Type
Technical Report
Publication Date
Aug 04, 2010
Accession Number
ADA569259

Entities

People

  • A. C. Gossard
  • C. M. Marcus
  • David P. DiVincenzo
  • E. A. Laird
  • J M Taylor
  • M. P. Hanson

Organizations

  • Harvard University

Tags

Communities of Interest

  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Carrier Frequencies
  • Circuits
  • Electron Energy
  • Electrons
  • Energy Levels
  • Frequency
  • Ground State
  • Lc Circuits
  • Magnetic Fields
  • Quantum Bits
  • Quantum Computing
  • Quantum Dots
  • Resonance
  • Resonant Circuits
  • Resonant Frequency
  • Spin States
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Approximation Theory.
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.

Technology Areas

  • Microelectronics
  • Microelectronics - Microelectromechanical Systems
  • Quantum Computing
  • Quantum Science - Quantum Dots