Coupling of Josephson current qubits using a connecting loop

Details Coupling of Josephson current qubits using a connecting loop Coupling of Josephson current qubits using a connecting loop

2003-05-07

arxiv.org/abs/cond-mat/0305127v3

Phys. Rev. B 70, 184525 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages with updates, version to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.70.184525

We propose a coupling scheme for the three-Josephson junction qubits which uses a connecting loop, but not mutual inductance. Present scheme offers the advantages of a large and tunable level splitting in implementing the controlled-NOT (CNOT) operation. We calculate the switching probabilities of the coupled qubits in the CNOT operations and demonstrate that present CNOT gate can meet the criteria for the fault-tolerant quantum computing. We obtain the coupling strength as a function of the coupling energy of the Josephson junction and the length of the connecting loop which varies with selecting two qubits from the scalable design.

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