Consistency of ground state and spectroscopic measurements on flux qubits

Abstract

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 separation. Such a reconstruction of a many-qubit Hamiltonian can be useful for future quantum information processing devices.

4 pages, 4 figures

References in corpus (4)

• Superconducting Circuits and Quantum Information
• Four-qubit device with mixed couplings
• Direct Josephson coupling between superconducting flux qubits
• Impedance measurement technique for quantum systems

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