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Q: Fachverband Quantenoptik und Photonik
Q 15: Quantum Information (Quantum Computing and Simulation)
Q 15.2: Talk
Tuesday, March 15, 2022, 11:00–11:15, Q-H12
Numerical optimization and demonstration of amplitude-modulatedpulses for microwave-driven entanglement-gates — •Markus Duwe1,2, Nicolas Pulido-Mateo1,2, Hardik Mendpara1,2, Giorgio Zarantonello3, Ludwig Krinner1,2, Amado Bautista-Salvador1,2, Klemens Hammerer4, Reinhard Werner4, and Christian Ospelkaus1,2 — 1Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover — 2PTB, Bundesallee 100, 38116 Braunschweig — 3National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305, USA — 4Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstrasse 2, 30167 Hannover, Germany
A universal set of quantum gates requires entangling operations with infidelities below the fault-tolerance threshold [1]. Trapped ions are one of the leading platforms approaching the required gate fidelities [2]. For trap-integrated microwave gate mechanisms, amplitude modulation of the gate drive has shown an increased of the resilience of two-qubit entangling operations against motional mode drifts [3]. Here we discuss the numerical optimization and experimental realization of pulse envelopes for the Mølmer-Sørensen entangling gate. The method allows the trajectory in phase space to be insensitive to chosen errors, such as trap and pulse parameters. We report infidelities approaching 10−3 with faster operation than previously shown in our experiment.
[1] E. Knill, Nature 434, 39 (2005)
[2] J. Gaebler et al., Phys. Rev. Lett. 117, 060505 (2016)
[3] G. Zarantonello et al., Phys. Rev. Lett. 123, 260503 (2019)