Fast tunable coupler for superconducting qubits |
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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 Martinis J M |
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Institution: | Department of Physics, University of California, Santa Barbara, California 93106, USA. |
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Abstract: | 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. |
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