1. Sign- and Magnitude-Tunable Coupler for Superconducting Flux Qubits
- Author
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Mark W. Johnson, J. Chung, Murray C. Thom, A. Yu. Smirnov, Paul I. Bunyk, Andrew J. Berkley, Alec Maassen van den Brink, Jacob Biamonte, Elliot Holtham, Richard Harris, Sergey Uchaikin, A. B. Wilson, S. Govorkov, and Mohammad H. Amin
- Subjects
Physics ,Coupling ,Superconductivity ,Quantum Physics ,Flux qubit ,Condensed matter physics ,Condensed Matter - Superconductivity ,FOS: Physical sciences ,General Physics and Astronomy ,Magnetic field ,Superconductivity (cond-mat.supr-con) ,Computer Science::Emerging Technologies ,Qubit ,Quantum Physics (quant-ph) ,Ground state ,Superconducting quantum computing ,Sign (mathematics) - Abstract
We experimentally confirm the functionality of a coupling element for flux-based superconducting qubits, with a coupling strength $J$ whose sign and magnitude can be tuned {\it in situ}. To measure the effective $J$, the groundstate of a coupled two-qubit system has been mapped as a function of the local magnetic fields applied to each qubit. The state of the system is determined by directly reading out the individual qubits while tunneling is suppressed. These measurements demonstrate that $J$ can be tuned from antiferromagnetic through zero to ferromagnetic., Updated text and figures
- Published
- 2007
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