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Using the extraordinary sensitivity of Andreev interferometers to thesuperconducting phase difference associated with currents, we measure thepersistent current quantum states in superconducting loops interrupted byJosephson junctions. Straightforward electrical resistance measurements of theinterferometers give continuous read-out of the states, allowing us toconstruct the energy spectrum of the quantum circuit. The probe is estimated tobe more precise and faster than previous methods, and can measure the localphase difference in a wide range of superconducting circuits.Comment: Changes made in light of referees comments; to appear in PR

Andreev Probe of Persistent Current States in Superconducting Quantum Circuits