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A solid-state single-photon filter.

Lorenzo De Santis1, Carlos Antón1, Bogdan Reznychenko2,3

  • 1Centre de Nanosciences et de Nanotechnologies, CNRS, Univ. Paris-Sud, Université Paris-Saclay, C2N - Marcoussis, 91460 Marcoussis, France.

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Summary
This summary is machine-generated.

This study demonstrates a highly efficient single-photon filter using a quantum dot cavity. The device achieves deterministic operation for quantum computing by strongly suppressing multi-photon components.

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Area of Science:

  • Quantum computing
  • Quantum optics
  • Solid-state physics

Background:

  • Linear optical quantum computing faces limitations due to probabilistic two-qubit gates.
  • Deterministic quantum gates can be achieved using single-photon nonlinearity in atomic transitions.
  • Previous attempts with semiconductor quantum dots were hindered by inefficient interfaces and dephasing.

Purpose of the Study:

  • To develop a highly efficient single-photon filter for deterministic quantum computing.
  • To engineer a near-optimal quantum-dot cavity interface for enhanced atom-photon interaction.

Main Methods:

  • Utilizing a large optical nonlinearity at the single-photon level within a quantum-dot cavity.
  • Probing the device with coherent light wavepackets to analyze its response.
  • Characterizing the photon statistics of the reflected light intensity.

Main Results:

  • Achieved a record nonlinearity threshold of approximately 0.3 incident photons.
  • Demonstrated that 80% of the reflected light intensity is a single-photon Fock state.
  • Significantly suppressed two- and three-photon components compared to the single-photon component.

Conclusions:

  • The developed quantum-dot cavity serves as a highly efficient single-photon filter.
  • This technology offers a promising route towards deterministic optical quantum computing.
  • Overcomes limitations of previous quantum dot-based approaches through improved interfaces and reduced dephasing.