Four-qubit device with mixed couplings

M. Grajcar; A. Izmalkov; S.H.W. van der Ploeg; S. Linzen; T. Plecenik; Th. Wagner; U. Hübner; E. Il'ichev; H.-G. Meyer; A.Yu. Smirnov; P.J. Love; A. Maassen van den Brink; M.H.S. Amin; S. Uchaikin; A.M. Zagoskin

doi:10.1103/PhysRevLett.96.047006

Four-qubit device with mixed couplings

M. Grajcar^*, A. Izmalkov, S.H.W. van der Ploeg, S. Linzen, T. Plecenik, Th. Wagner, U. Hübner, E. Il'ichev, H.-G. Meyer, A.Yu. Smirnov, P.J. Love, A. Maassen van den Brink, M.H.S. Amin, S. Uchaikin, A.M. Zagoskin

^*Corresponding author for this work

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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.

Original language	English
Article number	047006
Pages (from-to)	047006
Journal	Physical review letters
Volume	96
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.96.047006
Publication status	Published - 2006

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10.1103/PhysRevLett.96.047006

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Grajcar, M., Izmalkov, A., van der Ploeg, S. H. W., Linzen, S., Plecenik, T., Wagner, T., Hübner, U., Il'ichev, E., Meyer, H.-G., Smirnov, A. Y., Love, P. J., Maassen van den Brink, A., Amin, M. H. S., Uchaikin, S., & Zagoskin, A. M. (2006). Four-qubit device with mixed couplings. Physical review letters, 96(4), 047006. Article 047006. https://doi.org/10.1103/PhysRevLett.96.047006

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AU - Grajcar, M.

AU - Izmalkov, A.

AU - van der Ploeg, S.H.W.

AU - Linzen, S.

AU - Plecenik, T.

AU - Wagner, Th.

AU - Hübner, U.

AU - Il'ichev, E.

AU - Meyer, H.-G.

AU - Smirnov, A.Yu.

AU - Love, P.J.

AU - Maassen van den Brink, A.

AU - Amin, M.H.S.

AU - Uchaikin, S.

AU - Zagoskin, A.M.

PY - 2006

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AB - 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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VL - 96

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JO - Physical review letters

JF - Physical review letters

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ER -

Four-qubit device with mixed couplings

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