School of Physics Seminar - Professor Jianming Wen

Advancing Quantum Information Science and Technologies with Narrowband Entangled-Photon Generation in Neutral Atoms

Quantum information science stands at a transformative crossroads, poised to revolutionize diverse fields such as computing, cryptography, communication, networks, metrology, sensing, and imaging. Among various quantum systems, photonic qubits and neutral atoms shine as pivotal catalysts for this quantum revolution. This presentation explores the synergistic convergence of these platforms, with a central focus on pioneering narrowband entangled biphoton sources via spontaneous four-wave mixing (SFWM) in coherent atomic ensembles. Notably, we’ve recently achieved the unique feat of creating a reliable genuine W-class narrowband triphoton source directly through spontaneous six-wave mixing (SSWM) in hot atomic vapor with an unprecedented generation rate for the first time. Of importance, this breakthrough has inadvertently unveiled profound connections with the renowned three-body problem in mathematics and celestial mechanics for centuries. Our journey commences with foundational quantum concepts, surveys alternative qubit platforms, and dives into conventional biphoton generation methods like spontaneous parametric down-conversion (SPDC) and SFWM in solid materials. We unveil our recent breakthroughs in narrowband bi- and tri-photon generation within coherent atoms, promising long-distance quantum information processing and networking. Single photons, embodying unshakeable quantum properties, serve as versatile information carriers, while neutral atoms offer an ideal setting for nurturing long-lived qubits and quantum memory. We demystify the intricate mechanisms underlying entanglement generation with neutral atoms, shedding light on SFWM and SSWM principles. The talk concludes by showcasing our latest advancements, highlighting our capacity to generate unparalleled coherence and tunability in narrowband entangled photons. These attributes propel scalable quantum networks, connecting quantum processors and enabling secure global information exchange. As we embark on this enlightening journey, we illuminate the pivotal roles of single photons and neutral atoms in advancing quantum information science and technologies, inspiring fresh research avenues toward a quantum-enabled future.

Event Details


  • Date: 
    Wednesday, April 17, 2024 - 2:00pm to 4:00pm

Howey Physics Building N110