Fast Spin Rotations by Optically Controlled Geometric Phases in a Charge-Tunable InAs Quantum Dot

Abstract

We demonstrate optical control of the geometric phase acquired by one of the spin states of an electron confined in a charge-tunable InAs quantum dot via cyclic 2 pi excitations of an optical transition in the dot. In the presence of a constant in-plane magnetic field, these optically induced geometric phases result in the effective rotation of the spin about the magnetic field axis and manifest as phase shifts in the spin quantum beat signal generated by two time-delayed circularly polarized optical pulses. The geometric phases generated in this manner more generally perform the role of a spin phase gate, proving potentially useful for quantum information applications.

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Document Details

Document Type
Technical Report
Publication Date
Apr 23, 2010
Accession Number
ADA558662

Entities

People

  • A. S. Bracker
  • Bo Sun
  • D. G. Steel
  • D. Gammon
  • Erik D. Kim
  • Katherine Truex
  • Lu Jeu Sham
  • Xiaodong Xu

Organizations

  • University of Michigan

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Beat Signals
  • Energy Levels
  • Frequency
  • Magnetic Fields
  • Military Research
  • Modulation
  • Phase Shift
  • Polarization
  • Precession
  • Pulse Amplitude
  • Quantum Beats
  • Quantum Bits
  • Quantum Computing
  • Quantum Dots
  • Quantum Information
  • Rotation
  • Spin States

Fields of Study

  • Physics

Readers

  • Graph Algorithms and Convex Optimization.
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Radar Systems Engineering.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene
  • Quantum Computing
  • Quantum Science - Quantum Dots