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Multi-Terminal Superconducting Phase Qubit

M. H. S. Amin·A. N. Omelyanchouk·A. Blais·A. Maassen van den Brink·G. Rose·T. Duty·A. M. Zagoskin
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Abstract

Mesoscopic multi-terminal Josephson junctions are novel devices that provide weak coupling between several bulk superconductors through a common normal layer. Because of the nonlocal coupling of the superconducting banks, a current flow between two of the terminals can induce a phase difference and/or current flow in the other terminals. This "phase dragging" effect is used in designing a new type of superconducting phase qubit, the basic element of a quantum computer. Time-reversal symmetry breaking can be achieved by inserting a pi-phase shifter into the flux loop. Logical operations are done by applying currents. This removes the necessity for local external magnetic fields to achieve bistability or controllable operations.

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M. H. S. Amin, A. N. Omelyanchouk, A. Blais, A. Maassen van den Brink, G. Rose, T. Duty, A. M. Zagoskin. 2002-01-10. Multi-Terminal Superconducting Phase Qubit. https://doi.org/10.1016/s0921-4534(01)01187-x

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