Qubit Control Strategies Using Ballistic Fluxons

Fluxons transmitted on long Josephson junctions approximate ballistic particles and have been suggested as a basis reversible computation. These reversible circuits are attractive from the perspective of quantum computing because they are intrinsically low loss and can be fabricated from superconducting thin films and Josephson junctions—the same building blocks used for superconducting qubits. Here we explore using ballistic fluxons to bias a qubit, a first step in developing an integrated qubit controller. We present measurements of long Josephson junctions for qubit biasing and discuss simulations of measurement and readout circuits based on ballistic fluxons.



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