101 research outputs found

    Sign- and magnitude-tunable coupler for superconducting flux qubits

    Full text link
    We experimentally confirm the functionality of a coupling element for flux-based superconducting qubits, with a coupling strength JJ whose sign and magnitude can be tuned {\it in situ}. To measure the effective JJ, 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 JJ can be tuned from antiferromagnetic through zero to ferromagnetic.Comment: Updated text and figure
    • 

    corecore