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Suppressing Spectral Diffusion of Emitted Photons with Optical Pulses.

H F Fotso1, A E Feiguin2, D D Awschalom3

  • 1Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.

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Solid-state qubits can be stabilized using optical pulses to counteract spectral diffusion. This method enhances photon-mediated entanglement and photonic cavity coupling for quantum computing applications.

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Area of Science:

  • Quantum computing
  • Solid-state physics
  • Quantum optics

Background:

  • Solid-state qubits like quantum dots and color centers are crucial for quantum architectures.
  • Photon-mediated interfaces are essential but hindered by spectral diffusion, which causes uncontrollable frequency fluctuations in emitted photons.
  • This spectral diffusion poses a significant challenge for implementing photon-mediated quantum protocols.

Purpose of the Study:

  • To develop and demonstrate a method for stabilizing the emission frequency of solid-state quantum emitters.
  • To overcome the limitations imposed by spectral diffusion in photon-mediated quantum communication and computation.

Main Methods:

  • Applying a sequence of precisely timed optical pulses to the solid-state emitter.
  • Analytical and numerical simulations to demonstrate the method's effectiveness.
  • Experimental considerations using nitrogen-vacancy centers in diamond as a model system.

Main Results:

  • The proposed optical pulse sequence effectively stabilizes the emission line at a desired frequency.
  • Demonstrated suppression of spectral diffusion with a small number of nanosecond-scale pulses.
  • The method is shown to be efficient, robust, and feasible for practical implementation.

Conclusions:

  • Optical pulse sequences offer a simple and robust solution to mitigate spectral diffusion in solid-state quantum emitters.
  • This technique significantly improves the efficiency of photon-mediated entanglement and coupling to photonic cavities.
  • The findings pave the way for more reliable solid-state quantum computing architectures.