Flux Qubit Readout in the Persistent Current Basis at arbitrary Bias Points
arXiv:1904.13157 · doi:10.1103/PhysRevA.101.012305
Abstract
Common flux qubit readout schemes are qubit dominated, meaning they measure in the energy eigenbasis of the qubit. For various applications meausrements in a basis different from the energy eigenbasis are required. Here we present an indirect measurement protocol, which is detector dominated instead of qubit dominated, yielding a projective measurements in the persistent current basis for arbitrary bias points. We show that with our setup it is possible to perform a quantum nondemolition measurement (QND) in the persistent current basis at all flux bias points with fidelities reaching almost 100%.
arXiv comment5 pages, 3 figures + 5 pages Supplemental
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