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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Exciton-spin memory with a semiconductor quantum dot molecule.

A Boyer de la Giroday1, N Sköld, R M Stevenson

  • 1Toshiba Research Europe Limited, Cambridge Research Laboratory, 208 Science Park, Milton Road, Cambridge, CB4 0GZ, United Kingdom.

Physical Review Letters
|June 25, 2011
PubMed
Summary
This summary is machine-generated.

Researchers developed a quantum dot molecule device for storing single photons and spins. This semiconductor device enables electrical control over recombination, achieving photon storage up to 1 μs and spin-photon transfer with over 80% fidelity.

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Area of Science:

  • Quantum Information Science
  • Semiconductor Nanotechnology
  • Photonics

Background:

  • Quantum dot molecules offer unique properties for quantum information processing.
  • Efficient storage and manipulation of quantum states are crucial for quantum technologies.

Purpose of the Study:

  • To demonstrate a single photon and spin storage device using a semiconductor quantum dot molecule.
  • To investigate the electrical control of quantum state recombination and storage times.
  • To achieve high-fidelity transfer of photon polarization to electron-hole pair spins.

Main Methods:

  • Utilized a semiconductor quantum dot molecule as the storage medium.
  • Employed optical excitation to create single electron-hole pairs.
  • Applied electrical control to modify the recombination rate.
  • Used resonant excitation for spin-photon state transfer.

Main Results:

  • Achieved electrical control of recombination rates over three orders of magnitude.
  • Demonstrated single photon storage for up to 1 μs with subnanosecond readout.
  • Attained over 80% fidelity in transferring circular photon polarization to electron-hole pair spins.
  • Confirmed fidelity stability for storage times within the experimental repetition period.

Conclusions:

  • The quantum dot molecule serves as a viable platform for single photon and spin storage.
  • Electrical control offers a powerful method for managing quantum state lifetimes.
  • High-fidelity spin-photon interface is achievable, paving the way for quantum networking applications.