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

• URL: http://arxiv.org/abs/2203.11893v2
• Date: Thu, 14 Jul 2022 11:40:06 GMT
• Title: Analog quantum control of magnonic cat states on-a-chip by a superconducting qubit
• Authors: Marios Kounalakis, Gerrit E. W. Bauer, Yaroslav M. Blanter
• Abstract summary: We propose to directly and quantum-coherently couple a superconducting transmon qubit to magnons in a nearby magnetic particle. We predict a resonant qubit-magnon exchange and a nonlinear radiation-pressure interaction. We demonstrate a quantum control scheme that generates qubit-magnon entanglement and magnonic Schr"odinger cat states with high fidelity.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 Schr\"{o}dinger cat states with high fidelity.

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