Andreev Probe of Persistent Current States in Superconducting Quantum Circuits

Details Andreev Probe of Persistent Current States in Superconducting Quantum Circuits Andreev Probe of Persistent Current States in Superconducting Quantum Circuits

2005-03-02

arxiv.org/abs/cond-mat/0503061v2

Physics

Condensed Matter

Superconductivity

Changes made in light of referees comments; to appear in PRL

Scientific paper

10.1103/PhysRevLett.95.147001

Using the extraordinary sensitivity of Andreev interferometers to the superconducting phase difference associated with currents, we measure the persistent current quantum states in superconducting loops interrupted by Josephson junctions. Straightforward electrical resistance measurements of the interferometers give continuous read-out of the states, allowing us to construct the energy spectrum of the quantum circuit. The probe is estimated to be more precise and faster than previous methods, and can measure the local phase difference in a wide range of superconducting circuits.

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