Fast tunable coupler for superconducting qubits

Bialczak, R.C. et al. (2011) Fast tunable coupler for superconducting qubits. Physical Review Letters, 106(6), 060501. (doi: 10.1103/PhysRevLett.106.060501) (PMID:21405448)

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A major challenge in the field of quantum computing is the construction of scalable qubit coupling architectures. Here, we demonstrate a novel tunable coupling circuit that allows superconducting qubits to be coupled over long distances. We show that the interqubit coupling strength can be arbitrarily tuned over nanosecond time scales within a sequence that mimics actual use in an algorithm. The coupler has a measured on/off ratio of 1000. The design is self-contained and physically separate from the qubits, allowing the coupler to be used as a module to connect a variety of elements such as qubits, resonators, amplifiers, and readout circuitry over distances much larger than nearest-neighbor. Such design flexibility is likely to be useful for a scalable quantum computer.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Weides, Professor Martin
Authors: Bialczak, R.C., Ansmann, M., Hofheinz, M., Lenander, M., Lucero, E., Neeley, M., O’Connell, A.D., Sank, D., Wang, H., Weides, M., Wenner, J., Yamamoto, T., Cleland, A.N., and Martinis, J.M.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN (Online):1079-7114

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