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Bulletin of the American Physical Society

A programmable superconducting quantum processor with three all-to-all coupled qubits

Tanay Roy, Sumeru Hazra, S. Kundu, Madhavi Chand, Anirban Bhattacharjee, Kishor V. Salunkhe, Meghan P. Patankar, Kedar Damle, Rajamani Vijayaraghavan

Published Mar 5, 2019• 0 citations
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Higher-dimensional gates involving more than two qubits could play a major role in boosting the performance of quantum processors. While native two-qubit gates are ubiquitous on the superconducting-qubit platform, realizing high-fidelity three-qubit gates is challenging and typically requires multiple two-qubit gates, which leads to error accumulation. The authors utilize a multimodal ``trimon'' circuit to realize $n\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}v\phantom{\rule{0}{0ex}}e$ three-qubit gates that enable efficient implementation of important quantum algorithms, such as Grover's search. These results point to improved processor performance when the trimon is used as a building block for larger systems.