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Published on: November 11, 2013
Fluxon readout of a superconducting qubit
Kirill G Fedorov1, Anastasia V Shcherbakova2, Michael J Wolf3
1Physikalisches Institut and DFG-Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany and National University of Science and Technology MISIS, Leninsky prospekt 4, Moscow 119049, Russia.
Abstract:
An experiment demonstrating a link between classical single-flux quantum digital logic and a superconducting quantum circuit is reported. We implement coupling between a moving Josephson vortex (fluxon) and a flux qubit by reading out of a state of the flux qubit through a frequency shift of the fluxon oscillations in an annular Josephson junction. The energy spectrum of the flux qubit is measured using this technique. The implemented hybrid scheme opens an opportunity to readout quantum states of superconducting qubits with the classical fluxon logic circuits.
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