Regensburg 2022 – wissenschaftliches Programm
QI 4.23: Poster
Montag, 5. September 2022, 18:00–20:00, P2
Towards digital-analog quantum computing with superconducting qubits — Julia Lamprich1, Nicola Wurz1, •Stefan Pogorzalek1, Manish Thapa1, Vicente Pina-Canelles1, Antti Vepsäläinen2, Miha Papič1, 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, Nymphenburgerstr. 86, 80636 Munich, Germany — 2IQM Quantum Computers, Keilaranta 19, FI-02150 Espoo, Finland
Digital-Analog Quantum Computing (DAQC) is a novel approach to quantum computing. Here, one variant is banged DAQC where single qubit gates are applied on top of an analog (entangling) evolution. We have investigated the experimental and fundamental challenges in realizing banged DAQC for the example of preparing a Bell state. The main challenge in banged DAQC is the correct execution of single qubit gates under simultaneous qubit-qubit interaction. The latter is induced by a flux-tunable coupler element, which allows for the accumulation of conditional phase during the analog block. In addition, banged DAQC is compared to an alternative approach called stepwise DAQC, where the single qubit gates are executed only when the qubits do not interact. For both approaches, the relevant error sources are identified and fidelities are compared to the purely digital case.
We acknowledge support from the German Federal Ministry of Education and Research via the projects DAQC (13N15686) and Q-Exa (13N16062).