Entanglement of photonic modes from a continuously driven two-level system
Journal article, 2025
The ability to generate entangled states of light is a key primitive for quantum communication and distributed quantum computation. Continuously driven sources, including those based on spontaneous parametric downconversion, are usually probabilistic, whereas deterministic sources require accurate timing of the control fields. Here, we experimentally generate entangled photonic modes by continuously exciting a quantum emitter - a superconducting qubit - with a coherent drive, taking advantage of mode matching in the time and frequency domain. Using joint quantum state tomography and logarithmic negativity, we show that entanglement is generated between modes extracted from the two sidebands of the resonance fluorescence spectrum. Because the entangled photonic modes are perfectly orthogonal, they can be transferred into distinct quantum memories. Our approach can be utilized to distribute entanglement at a high rate in various physical platforms, with applications in waveguide quantum electrodynamics, distributed quantum computing, and quantum networks.
Author
Jiaying Yang
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Ericsson
Ingrid Strandberg
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Alejandro Vivas-Viaña
Universidad Autonoma de Madrid (UAM)
Spanish National Research Council (CSIC)
Akshay Gaikwad
Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics
Claudia Castillo-Moreno
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Anton Frisk Kockum
Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics
Muhammad Asad Ullah
Ericsson
Carlos Sánchez Munõz
Spanish National Research Council (CSIC)
Universidad Autonoma de Madrid (UAM)
Axel Martin Eriksson Lundström
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Simone Gasparinetti
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
npj Quantum Information
20566387 (eISSN)
Vol. 11 1 69Experimental Search for Quantum Advantages in Thermodynamics (ESQuAT)
European Commission (EC) (EC/HE/101041744), 2023-01-01 -- 2027-12-31.
Giant atoms - a new regime in quantum optics
Swedish Research Council (VR) (2019-03696), 2020-01-01 -- 2023-12-31.
Subject Categories (SSIF 2025)
Atom and Molecular Physics and Optics
Condensed Matter Physics
Other Physics Topics
DOI
10.1038/s41534-025-00995-1