Andreev Probe of Persistent Current States in Superconducting Quantum Circuits

Abstract

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.

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

References in corpus (4)

• Coherent Quantum Dynamics of a Superconducting Flux Qubit
• Continuous Monitoring of Rabi Oscillations in a Josephson Flux Qubit
• Nondestructive readout for a superconducting flux qubit
• Quantum nondemolition measurements of a qubit

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• Andreev interferometer with three superconducting electrodes
• Andreev bound states in junctions formed by conventional and $\mathcal{P}\mathcal{T}$-symmetric non-Hermitian superconductors
• Current-biased Andreev interferometer
• Nonlinear Resonance of Superconductor/Normal Metal Structures to Microwaves
• Andreev Interferometers in a Strong Radio Frequency Field
• Signatures of Long-Range Spin-Triplet Component in Andreev Interferometer
• Hybrid Quantum Interferometer in Bifurcation Mode as a Latching Quantum Readout
• Anomalous Andreev interferometer: Study of an anomalous Josephson junction coupled to a normal wire