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Two-Photon Blockade in an Atom-Driven Cavity QED System.

Christoph Hamsen1, Karl Nicolas Tolazzi1, Tatjana Wilk1

  • 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany.

Physical Review Letters
|April 15, 2017
PubMed
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Photon blockade, a quantum effect, is enhanced by driving a single atom in an optical cavity. This allows for two-photon blockade, suppressing further photon absorption and paving the way for multiphoton quantum nonlinear optics.

Area of Science:

  • Quantum optics
  • Quantum nonlinear dynamics

Background:

  • Photon blockade is a key quantum nonlinear effect.
  • Anharmonic energy ladders in driven systems are crucial.
  • Single atoms coupled to optical cavities are common systems.

Purpose of the Study:

  • To investigate photon blockade in a single-atom-cavity system.
  • To compare atom driving versus cavity driving for optical nonlinearity.
  • To demonstrate and implement two-photon blockade.

Main Methods:

  • Utilizing a single atom strongly coupled to an optical cavity.
  • Employing atom driving as the primary method to induce nonlinearity.
  • Analyzing emitted light for photon statistics (bunching and antibunching).

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Main Results:

  • Atom driving provides significantly greater optical nonlinearity than cavity driving.
  • Enhanced single-photon blockade was achieved.
  • Two-photon blockade was successfully implemented, suppressing subsequent photon absorption.
  • Observed three-photon antibunching and two-photon bunching in emitted light.

Conclusions:

  • Atom driving is superior for enhancing photon blockade in such systems.
  • The experiment demonstrates a significant advancement in multiphoton quantum nonlinear optics.
  • This work opens avenues for controlling multiphoton processes in quantum devices.