Consistency of Ground State and Spectroscopic Measurements on Flux Qubits

A. Izmalkov, S. H. W. van der Ploeg, S. N. Shevchenko, M. Grajcar, E. Il'ichev, U. Hübner, A. N. Omelyanchouk, H.-G. Meyer
2008 Physical Review Letters  
We compare the results of ground state and spectroscopic measurements carried out on superconducting flux qubits which are effective two-level quantum systems. For a single qubit and for two coupled qubits we show excellent agreement between the parameters of the pseudospin Hamiltonian found using both methods. We argue, that by making use of the ground state measurements the Hamiltonian of N coupled flux qubits can be reconstructed as well at temperatures smaller than the energy level
more » ... n. Such a reconstruction of a many-qubit Hamiltonian can be useful for future quantum information processing devices.
doi:10.1103/physrevlett.101.017003 pmid:18764145 fatcat:fozwbsi7yjejthzmh4r5bbz474