Bistable superconducting quantum interference device with built-in switchable π/2 phase shift

Smilde, Henk-Jan H.; Ariando; Rogalla, Horst; Hilgenkamp, Hans
November 2004
Applied Physics Letters;11/1/2004, Vol. 85 Issue 18, p4091
Academic Journal
Superconducting quantum interference devices (SQUIDs) have been realized with a built-in π/2 phase shift of the superconducting wave function. Its design is inspired by the phase-shifter concept, first proposed by Ioffe et al. [Nature 398, 679 (1999)] as the key element in a solid-state qubit configuration. It exploits the dx2-y2 order parameter symmetry in the high-Tc cuprates in multilayer structures based on YBa2Cu3O7-Nb ramp-type Josephson contacts. By reversing the sign of the persistent circulating current in the phase-shifting element, the π/2 SQUID can be controllably switched between two energetically degenerate ground states, with complementary magnetic flux dependencies.


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