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Four-qubit device with mixed couplings |
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| Authors: | Grajcar M Izmalkov A van der Ploeg S H W Linzen S Plecenik T Wagner Th Hübner U Il'ichev E Meyer H-G Smirnov A Yu Love Peter J Maassen van den Brink Alec Amin M H S Uchaikin S Zagoskin A M |
| Institution: | Institute for Physical High Technology, P.O. Box 100239, D-07702 Jena, Germany. |
| 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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