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Related Experiment Videos

Controlled phase shifts with a single quantum dot.

Ilya Fushman1, Dirk Englund, Andrei Faraon

  • 1Applied Physics, Stanford University, Stanford, CA 94305, USA.

Science (New York, N.Y.)
|May 10, 2008
PubMed
Summary
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A single quantum dot in a nanocavity enables controlled photon-photon interactions for quantum technologies. This quantum dot system demonstrates phase and amplitude modulation at the single-photon level, paving the way for on-chip quantum devices.

Area of Science:

  • Quantum optics
  • Solid-state physics
  • Nanophotonics

Background:

  • Optical nonlinearities are crucial for photon-photon interactions, underpinning quantum information processing and optical signal processing.
  • Current state-of-the-art nonlinearities are primarily achieved using single atoms or atomic ensembles.

Purpose of the Study:

  • To demonstrate controlled phase and amplitude modulation of light at the single-photon level using a quantum dot-photonic crystal nanocavity system.
  • To explore the potential of solid-state quantum emitters for on-chip quantum optical devices.

Main Methods:

  • Coupling a single quantum dot to a photonic crystal nanocavity.
  • Utilizing controlled photon numbers in a control beam to induce modulation.
  • Varying the wavelength of the control beam relative to the signal beam.

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Main Results:

  • Achieved controlled phase and amplitude modulation between two light modes at the single-photon level.
  • Observed phase shifts up to pi/4 and amplitude modulation up to 50% with larger control powers.
  • Demonstrated modulation using both on-resonance and detuned control wavelengths.

Conclusions:

  • A single quantum dot coupled to a nanocavity can serve as a powerful nonlinear optical element.
  • This system offers a scalable, on-chip platform for quantum information processing and quantum nondemolition measurements.
  • The results represent a significant advancement towards integrated quantum logic devices.