Suppression of Tunneling in a Superconducting Persistent-Current Qubit

Details Suppression of Tunneling in a Superconducting Persistent-Current Qubit Suppression of Tunneling in a Superconducting Persistent-Current Qubit

2007-12-12

arxiv.org/abs/0712.2059v1

Phys. Rev. B76, 220505(R) (2007)

Physics

Condensed Matter

Superconductivity

7 pages, 3 figures

Scientific paper

10.1103/PhysRevB.76.220505

We consider a superconducting persistent-current qubit consisting of a three-junction superconducting loop in an applied magnetic field. We show that by choosing the field, Josephson couplings, and offset charges suitably, we can perfectly suppress the tunneling between two oppositely directed states of circulating current, leading to a vanishing of the splitting between the two qubit states. The suppression arises for interference between tunneling along different paths, and is analogous to that predicted previously for magnetic particles with half-integer spin.

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