Controllable Coupling of Superconducting Flux Qubits
S. H. W. van der Ploeg, A. Izmalkov, Alec Maassen van den Brink, U. Hübner, M. Grajcar, E. Il’ichev, H.-G. Meyer, A. M. Zagoskin
DOI 10.1103/PhysRevLett.98.057004 · Physical Review Letters
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Abstract
We have realized controllable coupling between two three-junction flux qubits by inserting an additional coupler loop between them, containing three Josephson junctions. Two of these are shared with the qubit loops, providing strong qubit-coupler interaction. The third junction gives the coupler a nontrivial current-flux relation; its derivative (i.e., the susceptibility) determines the coupling strength J, which thus is tunable in situ via the coupler’s flux bias. In the qubit regime, J was varied from ∼45 (antiferromagnetic) to ∼−55 mK (ferromagnetic); in particular, J vanishes for an intermediate coupler bias. Measurements on a second sample illuminate the relation between two-qubit tunable coupling and three-qubit behavior.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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