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Bulletin of the American Physical Society

Longitudinally Coupled Three-Qubit Circuits as Building Blocks for a Quantum Processor

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

Published Mar 6, 2018• 0 citations
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The existing scalable superconducting quantum processors have only nearest-neighbor coupling. This leads to a reduced circuit depth, requiring a large series of gates to perform an arbitrary unitary operation in such systems. Recently, multi-modal devices have been demonstrated as a promising candidate for small quantum processor units. Always on longitudinal coupling in such circuits leads to implementation of native high fidelity multi-qubit gates. We propose an architecture using such devices as building blocks for a highly connected larger quantum circuit. To demonstrate a quantum operation between such blocks, a standard transmon is coupled to the multi-modal circuit using a 3D bus cavity giving rise to small exchange interaction between the transmon and one of the modes. We study the cross-resonance interaction in such systems and characterize the entangling operation and the unitary imperfections and crosstalk as a function of device parameters. Finally, we tune up the cross-resonance drive to implement multi-qubit gates in this architecture.
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.