Four-Qubit Device with Mixed Couplings


Grajcar, M. and Izmalkov, A. and Ploeg, S.H.W. van der and Linzen, S. and Plecenik, T. and Wagner, Th. and Hubner, U. and Ilíchev, H. and Meyer, H.-G. and Smirnov, A.Yu. and Love, Peter J. and Maassen van den Brink, Alec and Armin, M.H.S. and Uchaikin, S. and Zagoskin, A.M. (2006) Four-Qubit Device with Mixed Couplings. Physical Review Letters, 96 (4). 047006. ISSN 0031-9007

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Abstract: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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Copyright:© 2006 American Physical Society
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