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Quantum interference induced photon blockade in a coupled single quantum dot-cavity system.

Jing Tang1, Weidong Geng2, Xiulai Xu3

  • 11] Institute of Photo-electronic Thin Film Devices and Technology, Nankai University, Tianjin 300071, P. R. China [2] Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China.

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We demonstrate enhanced photon blockade in quantum dots using quantum interference. This method avoids two-photon excitation, significantly improving quantum statistics for quantum computing applications.

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Area of Science:

  • Quantum Optics
  • Solid-State Physics

Background:

  • Photon blockade is crucial for quantum information processing.
  • Existing methods often require strong quantum dot-cavity coupling.

Purpose of the Study:

  • To propose an experimental scheme for enhanced photon blockade.
  • To achieve strong photon blockade with a single quantum dot in a nanocavity.
  • To explore quantum interference for improved photon statistics.

Main Methods:

  • Simultaneous driving of cavity and quantum dot with two classical laser fields.
  • Utilizing quantum interference to suppress two-photon excitation.
  • Analyzing the second-order correlation function g((2))(0).

Main Results:

  • Photon blockade effect is tremendously enhanced via quantum interference.
  • g((2))(0) reduced by two orders of magnitude compared to Jaynes-Cummings model.
  • Observed asymmetry in photon statistics (bunching/antibunching) with detuning.

Conclusions:

  • The proposed scheme achieves strong photon blockade without strong coupling.
  • Controllable photon blockade demonstrated by tuning laser phases and Rabi coupling.
  • Effective method for solid-state quantum computation and information processing.