Analog Quantum Control of Magnonic Cat States on a Chip by a Superconducting Qubit
Marios Kounalakis, Gerrit E. W. Bauer, Yaroslav M. Blanter
DOI 10.1103/PhysRevLett.129.037205 · Physical Review Letters
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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.
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