Analog Quantum Control of Magnonic Cat States on a Chip by a Superconducting Qubit
M. Kounalakis (TU Delft - QN/Blanter Group, Kavli institute of nanoscience Delft)
Gerrit Bauer (Tohoku University, Chinese Academy of Sciences, Kavli institute of nanoscience Delft, TU Delft - QN/Bauer Group)
IM Blanter (TU Delft - QN/Blanter Group, Kavli institute of nanoscience Delft)
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Abstract
We propose to directly and quantum-coherently couple a superconducting transmon qubit to magnons - the quanta of the collective spin excitations, in a nearby magnetic particle. The magnet's stray field couples to the qubit via a superconducting quantum interference device. We predict a resonant magnon-qubit exchange and a nonlinear radiation-pressure interaction that are both stronger than dissipation rates and tunable by an external flux bias. We additionally demonstrate a quantum control scheme that generates magnon-qubit entanglement and magnonic Schrödinger cat states with high fidelity.