Perfect Single‐Magnon Generator Based on a Hybrid Cavity‐Magnonic System

• Published in: Annalen der Physik Vol. 534; no. 5
• Main Authors: Li, Shi‐Yan, Zhu, Ai‐Dong
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01-05-2022
• Subjects: Ambient temperature; Anharmonicity; cavity magnonics; Circuit design; Circuits; Coupled modes; Dipole interactions; Electric dipoles; Energy levels; Hybrid systems; Magnetic dipoles; magnon blockade; Magnons; quantum antibunching; Qubits (quantum computing); single‐magnon systems; Superconductivity
• ISSN: 0003-3804; 1521-3889
• DOI: 10.1002/andp.202100609

A theoretical scheme for a single‐magnon generator based on a hybrid cavity‐magnonic system, in which a microwave cavity is coupled to the magnetostatic mode through the magnetic dipole interaction and coupled to a superconducting qubit (transmon) through electric dipole interaction, and the virtual excitation of microwave photons mediates the interaction between the magnon mode and the transmon qubit, is proposed. The magnon blockade effect is studied based on the coexistence mechanism of anharmonicity of energy levels and multipath interference, and a global optimal condition of magnon blockade is obtained. The numerical results with accessible experimental parameters demonstrate that under this global optimal condition, a perfect single‐magnon generator with a second‐order correlation function tends to zero and a higher single‐magnon number can be achieved even at ambient temperature up to 25 mK. The current scheme is proposed based on the lithographically scalable and superconducting circuit compatible design, which provides convenience for precisely and flexibly engineering in experiments. It is expected to be used as an integrated single‐quanta generator in quantum network.
A scheme for as single‐magnon generator is proposed in a hybrid cavity‐magnonic system based on the coexistence mechanism of anharmonicity of energy levels and multipath interference. A global optimal condition of magnon blockade is obtained under which perfect magnon antibunching with a higher single‐magnon number can be achieved. Based on the lithographically scalable and superconducting circuit compatible design, the scheme provides convenience for precisely and flexibly engineering in experiments.