We discuss a novel method to read out a superconducting flux qubit at the flux degeneracy point, using a charge measurement through a single charge transistor SCT. The interaction is based on the Aharonov-Casher geometric phase. The read-out cycle indicates one of the states by a fluorescence-like cycle. We discuss how to efficiently implement this scheme with the SCT in the RF mode.
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Käck, A., Wendin, G. & Wilhelm, F.K. Efficient Read-out of Flux Qubits at Flux Degeneracy. Quantum Inf Process 5, 563–575 (2006). https://doi.org/10.1007/s11128-006-0035-0
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DOI: https://doi.org/10.1007/s11128-006-0035-0