Design of realistic switches for coupling superconducting solid-state qubits

Storcz, Markus J.; Wilhelm, Frank K.
September 2003
Applied Physics Letters;9/22/2003, Vol. 83 Issue 12, p2387
Academic Journal
Superconducting flux qubits are a promising candidate for solid-state quantum computation. One of the reasons is that implementing a controlled coupling between the qubits appears to be relatively easy, if one uses tunable Josephson junctions. We evaluate possible coupling strengths and show how much extra decoherence is induced by the subgap conductance of a tunable junction. In light of these results, we evaluate several options of using intrinsically shunted junctions and show that based on available technology, Josephson field effect transistors and high-T[sub c] junctions used as π shifters would be a good option, whereas the use of magnetic junctions as π shifters severely limits quantum coherence. © 2003 American Institute of Physics.


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