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A: Fachverband Atomphysik

A 28: Ultra-cold Plasmas and Rydberg Systems II (joint session A/Q)

A 28.4: Vortrag

Donnerstag, 5. März 2026, 12:15–12:30, N 2

Cryogenic Strontium Quantum Processor — •Xintong Su, Roberto Franco, Valerio Amico, Jonas Drotleff, and Christian Groß — Physikalisches Institut, Eberhard Karls Universität Tübingen, Germany

With the increasing perfection in the control of quantum mechanical many-body systems, first steps for the realization of simple quantum computers have been made. Various physical systems can serve as a basis for such quantum computers. Neutral Rydberg atoms in optical tweezers are among the most promising technologies in the race to build a quantum computer. This platform unites fundamentally indistinguishable qubits and precise control via light fields with scalability in the size of the qubit register. In our project, we work with fermionic 87Sr. The qubit states are defined on two hyperfine sublevels of the ground state. Our goal is to combine the optical tweezer technology with a carefully designed cryogenic setup at 4K. This will result in exceptionally long coherence and lifetime of the atoms in the optical tweezer array and forms the basis for scalability to large atom numbers. Furthermore, the intensity of black-body radiation is strongly reduced in cryogenic environments. Therefore, detrimental coupling between neighbouring Rydberg states, a potential source for collective decoherence in a quantum processor, is suppressed. Finally, the cryogenic environment enables the usage of superconducting coils, which offers outstanding passive stability of the magnetic field and thereby increases the qubit coherence.

Keywords: Rydberg atoms; Ultracold strontium; Quantum computing; Quantum processing; Optical tweezer array