Quantum theory of the low-frequency linear susceptibility of interferometer-type superconducting qubits

Details Quantum theory of the low-frequency linear susceptibility of interferometer-type superconducting qubits Quantum theory of the low-frequency linear susceptibility of interferometer-type superconducting qubits

2007-09-16

arxiv.org/abs/0709.2459v2

Physical Review B 77, 094513 (2008)

Physics

Condensed Matter

Superconductivity

11 pages, 5 figures; the title and abstract are slightly changed; several typos are corrected; in order to make our argumentat

Scientific paper

10.1103/PhysRevB.77.094513

We use the density matrix formalism to analyze the interaction of interferometer-type superconducting qubits with a high quality tank circuit, which frequency is well below the gap frequency of a qubit. We start with the ground state characterization of the superconducting flux and charge qubits. Then, by making use of a dressed state approach we describe the qubits' spectroscopy when the qubit is irradiated by a microwave field which is tuned to the gap frequency. The last section of the paper is devoted to continuous monitoring of qubit states by using a DC SQUID in the inductive mode.

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