Optical Control of One and Two Hole Spins in Interacting Quantum Dots

Abstract

A single hole spin in a semiconductor quantum dot has emerged as a quantum bit that is potentially superior to an electron spin. A key feature of holes is that they have a greatly reduced hyperfine interaction with nuclear spins, which is one of the biggest difficulties in working with an electron spin. It is now essential to show that holes are viable for quantum information processing by demonstrating fast quantum gates and scalability. To this end, we have developed InAs/GaAs quantum dots coupled through coherent tunnelling and charged with controlled numbers of holes. We report fast, single-qubit gates using a sequence of short laser pulses. We then take the important next step towards scalability of quantum information by optically controlling two interacting hole spins in separate dots.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 2011
Accession Number
ADA554725

Entities

People

  • Alex Greilich
  • Allan S. Bracker
  • Daniel Gammon
  • Danny Kim
  • Samuel G Carter

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Acousto-Optic Modulators
  • Frequency
  • Frequency Shift
  • Ground State
  • Laser Diodes
  • Magnetic Fields
  • Military Research
  • Nuclear Spins
  • Photonics
  • Quantum Bits
  • Quantum Computing
  • Quantum Dots
  • Quantum Information
  • Resonance
  • Semiconductors
  • Spectra
  • Spectroscopy

Fields of Study

  • Physics

Readers

  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.

Technology Areas

  • Directed Energy
  • Microelectronics
  • Quantum Computing
  • Quantum Science - Quantum Dots