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QI: Fachverband Quanteninformation

QI 8: Quantum Information: Poster (joint session QI/Q)

QI 8.9: Poster

Wednesday, September 22, 2021, 16:30–18:30, P

Site-specific Rydberg excitation in a multi-site quantum register of neutral atoms — •Tobias Schreiber, Dominik Schäffner, Jan Lautenschläger, Malte Schlosser, and Gerhard Birkl — Institut für Angewandte Physik, TU Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt, Germany

Applications in quantum technologies, such as quantum information science and metrology, demand for scalable platforms of identical quantum systems. Additionally, precise spatial control and fast switching of quantum states and of qubit coupling constitute milestones for quantum computing and simulation.

We present a micro-optical platform for defect-free assembled 2D clusters of more than 100 single-atom quantum systems [1] and demonstrate site-resolved excitations into various Rydberg states [2]. Together with fast addressing of individual array sites at a microsecond timescale, we gain real-time control over interactions between next neighbors in the quantum register. This allows the demonstration of Rydberg blockade with tunable blockade strength dependent on the respective state and atom separation. In combination with long coherence times for the prepared hyperfine states of the atoms, this technique leads the way to quantum computing and simulation with neutral atoms in our experimental setup.

[1] D. Ohl de Mello et. al., Phys. Rev. Lett. 122, 203601 (2019).

[2] M. Schlosser et. al., J. Phys. B: At. Mol. Opt. Phys. 53 144001 (2020).