Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 37: Polaritonic Effects in Molecular Systems II (joint session MO/Q)
Q 37.3: Talk
Wednesday, March 12, 2025, 11:30–11:45, HS XV
Quantum algorithms for QED systems — •Francesco Troisi1, Simone Latini2, Heiko Appel1, Ivano Tavernelli4, and Angel Rubio1,3 — 1MPSD, Hamburg, Germany — 2Department of Physics, DTU, Lyngby, Denmark — 3CCQ, Flatiron Institute, Simons Foundation, NYC, USA — 4IBM Quantum, IBM Research, Zurich, Säumerstrasse 4, 8803 Rüschlikon, Switzerland
Controlling the properties of matter is a central theme in modern science. Optical cavities provide a promising approach to controlling them by coupling the electronic transitions to the confined photons inside the cavity, making the photonic and electronic states inseparable. The polaritonic states are obtained, which due to the strong coupling regime, cannot be described by the perturbative approach. On a classical computer, this introduces big computational challenges as the QED matrix grows exponentially with the number of photonic modes and Fock states. Quantum Computing is a promising tool for studying such systems as adding one cavity mode requires as little as one qubit. Due to the complexity of the physics in materials or complex molecules, we approach the cavity QED problem with a simpler system, such that we can learn the challenges in a controlled environment. In this work we couple a two-level matter system to many cavity modes, and we focus on studying a well-known physical phenomenon, the spontaneous emission, where excited atoms emit photons upon returning to their ground state. Despite its simplicity, one can still observe many features such as the Rabi oscillations and the decay rate making it an ideal candidate for approaching QED problems.
Keywords: QED; Quantum Computing; Polaritons