Four-qubit device with mixed couplings

Details Four-qubit device with mixed couplings Four-qubit device with mixed couplings

2005-09-21

arxiv.org/abs/cond-mat/0509557v2

Phys. Rev. Lett._96_, 047006 (2006)

Physics

Condensed Matter

Superconductivity

REVTeX 4, 5pp., 7 EPS figure files. N.B.: "Alec" is my first, and "Maassen van den Brink" my family name. v2: final published

Scientific paper

10.1103/PhysRevLett.96.047006

We present the first experimental results on a device with more than two superconducting qubits. The circuit consists of four three-junction flux qubits, with simultaneous ferro- and antiferromagnetic coupling implemented using shared Josephson junctions. Its response, which is dominated by the ground state, is characterized using low-frequency impedance measurement with a superconducting tank circuit coupled to the qubits. The results are found to be in excellent agreement with the quantum-mechanical predictions.

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