High-Fidelity Universal Gates in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi/><mml:mn>171</mml:mn></mml:msup></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Yb</mml:mi></mml:math> Ground-State Nuclear-Spin Qubit
Juan A. Muniz, M. B. Stone, D. T. Stack, M. Jaffé, Jonathan M. Kindem, Laura Wadleigh, E. Zalys-Geller, X. Zhang, Chi‐An Chen, Matthew A. Norcia, J. Epstein, Edward C. Halperin, Frederic Hummel, Thomas Wilkason, Ming Li, Katrina Barnes, P. Battaglino, Thomas C. Bohdanowicz, Garrett S. Booth, A. Brown, M. O. Brown, William B. Cairncross, Kayleigh Cassella, Robin Coxe, Daniel Crow, M. Feldkamp, C. Griger, A. Heinz, A. M. W. Jones, Hyosub Kim, Jonathan P. King, Krish Kotru, J. Lauigan, J. Marjanovic, E. Megidish, M. Meredith, Mickey McDonald, Rosaleen Morshead, S. Narayanaswami, C. Nishiguchi, T. Paule, Kelly Ann Pawlak, Kristen L. Pudenz, David Rodríguez Pérez, Albert Ryou, Jonathan Simon, A. Smull, Miroslav Urbánek, R. J. M. van de Veerdonk, Zachary Vendeiro, Tsung-Yao Wu, Xin Xie, Benjamin Bloom
Abstract
Arrays of optically trapped neutral atoms are a promising architecture for the realization of quantum computers. In order to run increasingly complex algorithms, it is advantageous to demonstrate high-fidelity and flexible gates between long-lived and highly coherent qubit states. In this work, we demonstrate a universal high-fidelity gate set with individually controlled and parallel application of single-qubit gates and two-qubit gates operating on the ground-state nuclear-spin qubit in arrays of tweezer-trapped <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msup><a:mi/><a:mn>171</a:mn></a:msup></a:math><c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mi>Yb</c:mi></c:math> atoms. We utilize the long lifetime, flexible control, and high gate fidelity of our system to characterize native gates using single- and two-qubit Clifford and symmetric subspace randomized-benchmarking circuits with more than 200 controlled-<e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mi>Z</e:mi></e:math> () gates applied to one or two pairs of atoms. We measure our two-qubit entangling gate fidelity to be 99.72(3)% (99.40(3)%) with (without) postselection. In addition, we introduce a simple and optimized method for calibration of multiparameter quantum gates. These results represent important milestones toward executing complex and general quantum computation with neutral atoms.