Regensburg 2022 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 6: Quantum Information: Concepts and Methods
QI 6.8: Vortrag
Dienstag, 6. September 2022, 11:45–12:00, H9
Preparation of maximally entangled states with digital-analog quantum computing — •Nicola Wurz1, Julia Lamprich1, Manish Thapa1, Vicente Pina Canelles1, Stefan Pogorzalek1, Antti Vepsäläinen2, Miha Papic1, Jayshankar Nath1, Florian Vigneau1, Daria Gusenkova1, Ping Yang1, Hermanni Heimonen2, Hsiang-Sheng Ku1, Adrian Auer1, Johannes Heinsoo2, Frank Deppe1, and Inés de Vega1 — 1IQM Quantum Computers, Munich, Germany — 2IQM Quantum Computers, Espoo, Finland
Digital-Analog Quantum Computing (DAQC) is a novel approach, which combines digital single qubit gates with analog multi-qubit blocks. The DAQC concept distinguishes between stepwise and banged DAQC, where the single qubit gates are placed in between analog blocks or applied simultaneously with the analog (entangling) evolution, respectively. We have identified relevant sources of error for both DAQC protocols. When preparing a maximally entangled two-qubit state using either stepwise or banged DAQC, we reach similar fidelities as in the purely digital case. The multi-qubit version of the implemented circuit allows us to create GHZ states by parallelizing several two-qubit interactions. For the case of three qubits, we have investigated infidelities arising due to the multi-qubit nature of the interaction, including parasitic and higher order couplings.
We acknowledge support from the German Federal Ministry of Education and Research via the projects DAQC (13N15686) and Q-Exa (13N16062).