Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 28: Ultra-cold Atoms, Ions and BEC II (joint session A/Q)
A 28.1: Talk
Thursday, March 14, 2024, 11:00–11:15, HS 1098
Realization of the 88Sr fine-structure qubit: The building block for a 500-qubit quantum computer demonstrator (QRydDemo) — •Govind Unnikrishnan1, Jennifer Krauter1, Philipp Ilzhöfer1, Ratnesh Kumar Gupta1, Jiachen Zhao1, Achim Scholz1, Christian Hölzl1, Aaron Götzelmann1, Sebastian Weber2, Nastasia Makki2, Hans Peter Büchler2, Jürgen Stuhler3, Florian Meinert1, and Tilman Pfau1 — 15. Physikalisches Institut and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — 2Institute for Theoretical Physics III and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — 3Toptica Photonics AG, 82166 Gräfelfing, Germany
The QRydDemo project aims to realize a quantum computer demonstrator with 500 qubits based on the novel fine-structure qubit encoded in the metastable triplet manifold of 88Sr, which enables fast gates (100 ns) and a long coherence time (10 ms). Here, we demonstrate the first step towards this goal by realizing preparation, readout and coherent operations on the fine-structure qubit. In addition to driving Rabi oscillations bridging an energy gap of 17 THz, we also carry out Ramsey spectroscopy with which we extract the coherence time T2 in our system. A full quantum mechanical model is used to simulate our experiments by including noise sources to identify the main constraints limiting our coherence time and project improvements to our system in the immediate future.
Keywords: Quantum Computer; Neutral atoms; Strontium; Tweezer; Atom array