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 3.1: Vortrag
Mittwoch, 16. März 2022, 14:00–14:15, Audimax
Optimal quantum gates for a Rydberg atoms quantum computer — •Alice Pagano1,2,3, Sebastian Weber1, Hans Peter Büchler1, and Simone Montangero2,3 — 1Institute for Theoretical Physics III, University of Stuttgart, Stuttgart, Germany — 2Institute for complex quantum systems, University of Ulm, Ulm, Germany — 3Dipartimento di Fisica e Astronomia "G. Galilei", Università di Padova, I-35131 Padova, Italy
Arrays of neutral atoms trapped in optical tweezers are a promising candidate for use in quantum computing. These platforms are highly scalable to large numbers of qubits and neutral atoms boost several attractive features as long coherence times and entanglement via strong dipole-dipole interactions by driving them to highly excited Rydberg states. We aim to realize a Rydberg atom quantum processor with several hundred qubits in the next few years. The smallest building blocks are one and two-qubit quantum gates: to entangle two atoms in the quantum register, a controlled-phase (CZ) gate will be implemented by shining laser pulses onto the two selected atoms. We exploit the Hamiltonian of two atoms to perform a numerical simulation that reproduces the behavior of the CZ gate. We take into account finite temperature, an imperfect Rydberg blockade, and decay out of the Rydberg state as well as a realistic finite raise time for the laser pulses. We compare a protocol with constant pulses obtained via classical optimizers against time-dependent pulses found through the optimal control algorithm dCRAB in an open-loop optimization. The optimal control solution improves the fidelity from 98.65% to 99.90%.