Physics – Condensed Matter – Superconductivity
Scientific paper
2008-05-23
Physics
Condensed Matter
Superconductivity
38 pages, 7 figures
Scientific paper
10.1103/PhysRevB.77.214512
We analyze the behavior of a dc Superconducting Quantum Interference Device (SQUID) phase qubit in which one junction acts as a phase qubit and the rest of the device provides isolation from dissipation and noise in the bias leads. Ignoring dissipation, we find the two-dimensional Hamiltonian of the system and use numerical methods and a cubic approximation to solve Schrodinger's equation for the eigenstates, energy levels, tunneling rates, and expectation value of the currents in the junctions. Using these results, we investigate how well this design provides isolation while preserving the characteristics of a phase qubit. In addition, we show that the expectation value of current flowing through the isolation junction depends on the state of the qubit and can be used for non-destructive read out of the qubit state.
Anderson James R.
Lobb C. J.
Mitra Kaushik
Strauch Frederick W.
Tiesinga Eite
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