Erlangen 2022 – wissenschaftliches Programm

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SYRY: Symposium Rydberg Physics in Single-Atom Trap Arrays

SYRY 3: Rydberg Physics in Single-Atom Trap Arrays 2

SYRY 3.2: Vortrag

Mittwoch, 16. März 2022, 14:15–14:30, Audimax

Time-Optimal Parallel Multiqubit Gates for Rydberg Atoms — •Sven Jandura and Guido Pupillo — Institute de Science et d’Ingénierie Supramoléculaires (ISIS), University of Strasbourg, 67000 Strasbourg, France

Entangling gates between two or more qubits stored in the electronic states of neutral atoms can be implemented via the strong and long-range interaction of atoms in highly excited Rydberg states. Two properties of a gate are particularly desirable: Firstly, the gate should be fast, since many types of error can be mitigated by short gate durations. Secondly, the gate should be parallel, meaning that only global instead of single site addressability with a control laser is needed, thereby simplifying the experimental setup. In this work we use two quantum optimal control techniques, gradient ascent pulse engineering (GRAPE) and Pontryagins’s maximum principle, to determine time-optimal parallel laser pulses implementing a controlled-Z(CZ) gate and a three qubit C₂Z gate. Our pulses improve upon the traditional non-parallel pulses for the CZ and the C₂Z gate with just a limited set of variational parameters, demonstrating the potential of quantum optimal control techniques for advancing quantum computing with Rydberg atoms.