Year: 2025
Type: article
Abstract: 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.
Source: npj Quantum Information
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,290
Funders: “la Caixa” Foundation, European Commission, Stiftelsen för Strategisk Forskning, Chalmers Tekniska Högskola, Knut och Alice Wallenbergs Stiftelse, Vetenskapsrådet, Intelligence Advanced Research Projects Activity, HORIZON EUROPE Framework Programme, Wallenberg Centre for Molecular and Translational Medicine, Wallenberg Center for Quantum Technology, Chalmers University of Technology, HORIZON EUROPE European Research Council
Awards: QuantumStack: Programmering av kvantdatorn, G1255325603, Junior Leader la Caixa Postdoctoral Fellowship Programme: Shaping the new generation of leaders in research, G2511972022, G3531767269, G3731544974, G434337789, G4993383890, G5065677113, Experimental Search for Quantum Advantages in Thermodynamics, Giant atoms - a new regime in quantum optics, G5442384851, Open Superconducting Quantum Computers (OpenSuperQPlus), G598773271, G5987792135, G7731791180, G8023785571, Kvantsimulering och kvantkommunikation med stora atomer
OpenAlex ID: W4409869387