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Updated: Apr 25, 2026
06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
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Persistent quantum beats and long-distance entanglement from waveguide-mediated interactions.
Huaixiu Zheng1, Harold U Baranger1
1Department of Physics, Duke University, P.O. Box 90305, Durham, North Carolina 27708, USA.
Physical Review Letters
|August 29, 2014
Summary
We explore photon correlations and entanglement in coupled qubits within a waveguide. Our novel method reveals long-lasting quantum beats and enables high-fidelity, long-distance entanglement for quantum networks.
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.
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