Analog quantum control of magnonic cat states on-a-chip by a superconducting qubit

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 (SQUID). We predict a resonant qubit-magnon 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 qubit-magnon entanglement and magnonic Schrödinger cat states with high fidelity.

Second version is the same as the one published in Physical Review Letters

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• Magnomechanical backaction corrections due to coupling to higher order Walker modes and Kerr nonlinearities
• Pure dephasing of magnonic quantum states
• Floquet generation of magnonic NOON state
• Protocol for generating an arbitrary quantum state of the magnetization in cavity magnonics
• Chiral current in Floquet cavity-magnonics