Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 54: Posters: Quantum Optics and Photonics IV
Q 54.36: Poster
Thursday, March 12, 2020, 16:30–18:30, Empore Lichthof
High fidelity two-qubit quantum gate with neutral atoms — •Hui Sun1,2, Bing Yang1,2, Han-yi Wang1,2, Zhen-sheng Yuan1,2, and Jian-wei Hui1,2 — 1Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany — 2Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
Cold neutral atoms hold great promise for constructing a quantum device that outperform the classical computer. However, the imperfections of gate operations hinder the implementation of fault-tolerant quantum computing, which requires the operation error to be lower than the threshold 10−2. Here, we report on a high-fidelity two-qubit gate entangling 1250 pairs of neutral atoms in parallel with a operation error of 7(1) × 10−3. By improving the precision of controlling the lattice potential, the gate operation driven by the second-order superexchange interaction achieve the same energy scale as the on-site interaction of the Hubbard model. The coherence time is prolonged and the decoherence of entanglement in optical lattice is mainly governed by the intrinsic light scattering. We calibrate the gate fidelity to be 99.3(1)% by measuring spin correlations of the quantum state after multiple gates performed on the atom pairs. Our experiment represents a benchmark towards fault-tolerant quantum computing with neutral atoms.