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Entanglement of photonic modes from a continuously driven two-level system
Jiaying Yang1,2, Ingrid Strandberg1, Alejandro Vivas-Viaña3,4
1Department of Microtechnology and Nanoscience, Chalmers University of Technology, Göteborg, Sweden.
NPJ Quantum Information
|May 1, 2025
Summary
Researchers generated entangled photonic modes using a continuously driven superconducting qubit. This breakthrough offers a deterministic method for distributing entanglement, advancing quantum communication and computation.
Area of Science:
- Quantum Information Science
- Quantum Optics
- Solid-State Quantum Systems
Background:
- Generating entangled states of light is crucial for quantum communication and computation.
- Existing methods are often probabilistic or require precise timing.
- Superconducting qubits offer a promising platform for quantum information processing.
Purpose of the Study:
- To experimentally generate entangled photonic modes using a continuously driven superconducting qubit.
- To demonstrate a deterministic source of entanglement for quantum applications.
- To explore the potential of resonance fluorescence for creating entangled light states.
Main Methods:
- Continuous excitation of a superconducting qubit with a coherent drive.
- Utilizing mode matching in time and frequency domains.
- Employing joint quantum state tomography and logarithmic negativity to verify entanglement.
Main Results:
- Successfully generated entangled photonic modes from the sidebands of the resonance fluorescence spectrum.
- Demonstrated perfect orthogonality of the entangled photonic modes.
- Confirmed entanglement using quantum state tomography and logarithmic negativity.
Conclusions:
- Continuous driving of superconducting qubits provides a deterministic route to entangled photons.
- Orthogonal entangled modes can be efficiently transferred to quantum memories.
- This method enables high-rate entanglement distribution for quantum networks and distributed quantum computing.
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