Sign- and magnitude-tunable coupler for superconducting flux qubits

Details Sign- and magnitude-tunable coupler for superconducting flux qubits Sign- and magnitude-tunable coupler for superconducting flux qubits

2006-08-11

arxiv.org/abs/cond-mat/0608253v4

Physical Review Letters, Volume 98, 177001 (2007)

Physics

Condensed Matter

Superconductivity

Updated text and figures

Scientific paper

10.1103/PhysRevLett.98.177001

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.

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