Josephson-Junction Qubits with Controlled Couplings

Details Josephson-Junction Qubits with Controlled Couplings Josephson-Junction Qubits with Controlled Couplings

1998-08-06

arxiv.org/abs/cond-mat/9808067v1

Nature 398, 305-307 (1999)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

RevTex, 5 pages, 3 figures, see also cond-mat/9801125

Scientific paper

10.1038/18613

Low-capacitance Josephson junctions, where Cooper pairs tunnel coherently while Coulomb blockade effects allow the control of the total charge, provide physical realizations of quantum bits (qubits), with logical states differing by one Cooper-pair charge on an island. The single- and two-bit operations required for quantum computation can be performed by applying a sequence of gate voltages. A basic design, described earlier [cond-mat/9706016], is sufficient to demonstrate the principles, but requires a high precision time control, and residual two-bit interactions introduce errors. Here we suggest a new nano-electronic design, close to ideal, where the Josephson junctions are replaced by controllable SQUIDs. This relaxes the requirements on the time control and system parameters substantially, and the two-bit coupling can be switched exactly between zero and a non-zero value for arbitrary pairs. The phase coherence time is sufficiently long to allow a series of operations.

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