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Bistable superconducting quantum interference device with built-in switchable π/2 phase shift
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DOI：10.1063/1.1812813.png)
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Superconducting quantum interference devices (SQUIDs) have been realized with a built-in pi/2 phase shift of the superconducting wave function. Its design is inspired by the phase-shifter concept, first proposed by Ioffe [Nature 398, 679 (1999)] as the key element in a solid-state qubit configuration. It exploits the d(x)(2)-y(2) order parameter symmetry in the high-T-c 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 pi/2 SQUID can be controllably switched between two energetically degenerate ground states, with complementary magnetic flux dependencies. (C) 2004 American Institute of Physics.
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PAIRING SYMMETRY
YBA2CU3O7-DELTA
JUNCTION
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