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We present a scheme for a quantum controlled-phase-flip (CPF) gate linking flying photons and atomic qubits. This method utilizes Rydberg blockade for robust quantum network connections.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Optics

Background:

  • Quantum networks require robust gates between flying and stationary qubits.
  • Existing methods often demand strong single-atom-photon coupling, limiting practicality.

Purpose of the Study:

  • To propose a scheme for a quantum controlled-phase-flip (CPF) gate.
  • To enable reliable quantum communication between optical photons and atomic ensembles.

Main Methods:

  • Utilizing a cavity input-output process with a Rydberg atomic ensemble.
  • Employing dark resonance and Rydberg blockade to induce conditional phase shifts on photons.
  • Operating in the N-atoms strong-coupling regime.

Main Results:

  • Successfully demonstrated a scheme for a quantum controlled-phase-flip (CPF) gate.
  • The use of Rydberg blockade significantly relaxes the stringent single-atom strong coupling requirement.
  • Achieved conditional phase shift on a flying photon pulse reflected from the cavity.

Conclusions:

  • The proposed scheme offers a practical approach for building quantum networks.
  • It enhances the feasibility of linking distant quantum computational nodes.
  • This work paves the way for more robust quantum information processing and communication.