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Area of Science:

  • Quantum optics
  • Solid-state physics
  • Quantum information science

Background:

  • Waveguide quantum electrodynamics (QED) systems are promising for quantum information processing.
  • Understanding photon-photon correlations and entanglement generation is crucial for scalable quantum technologies.

Purpose of the Study:

  • Investigate photon-photon correlations and entanglement generation in a 1D waveguide coupled to two spatially separated qubits.
  • Develop a method to handle nonlinearities and 1D continuum interactions.

Main Methods:

  • A novel Green function method is developed to analyze the system.
  • The study goes beyond the Markovian approximation to capture non-Markovian effects.

Main Results:

  • Vacuum-mediated qubit-qubit interactions lead to quantum beats in the second-order correlation function.
  • Observed quantum beats persist significantly longer than the qubit lifetime.
  • Demonstrated the generation of high-fidelity, long-distance entanglement between qubits.

Conclusions:

  • The developed Green function method effectively treats complex waveguide-QED systems.
  • Long-lasting quantum beats indicate non-Markovian dynamics.
  • Waveguide-QED architectures hold significant potential for scalable quantum networking.