Related papers: Strong tunable spin-spin coupling with cavity-magnon criticality

Strong tunable spin-spin coupling with cavity-magnon criticality

URL: http://arxiv.org/abs/2304.13553v3
Date: Fri, 16 Aug 2024 07:08:45 GMT
Title: Strong tunable spin-spin coupling with cavity-magnon criticality
Authors: Ma-Lei Peng, Miao Tian, Xue-Chun Chen, Guo-Qiang Zhang, Hai-Chao Li, Wei Xiong,
Abstract summary: We propose a hybrid quantum system, consisting of a coplanar waveguide (CPW) resonator weakly coupled to a single nitrogen-vacancy spin in diamond and a yttrium-iron-garnet nanosphere holding Kerr magnons. With a strong driving field on magnons, the Kerr effect can squeeze magnons, and thus the coupling between the CPW resonator and the squeezed magnons is it exponentially enhanced When the enhanced cavity-magnon coupling approaches the critical value, the spin is fully decoupled from the HP, while the coupling between the spin and the LP is
Score: 5.8269379870293205
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Strong long-distance spin-spin coupling is desperately demanded for solid-state quantum information processing, but it is still challenged. Here, we propose a hybrid quantum system, consisting of a coplanar waveguide (CPW) resonator weakly coupled to a single nitrogen-vacancy spin in diamond and a yttrium-iron-garnet (YIG) nanosphere holding Kerr magnons, to realize strong long-distance spin-spin coupling. With a strong driving field on magnons, the Kerr effect can squeeze magnons, and thus the coupling between the CPW resonator and the squeezed magnons is {\it exponentially enhanced}, which produces two cavity-magnon polaritons, i.e., the high-frequency polariton (HP) and low-frequency polariton (LP). When the enhanced cavity-magnon coupling approaches the critical value, the spin is fully decoupled from the HP, while the coupling between the spin and the LP is significantly improved. In the dispersive regime, a strong spin-spin coupling is achieved with accessible parameters. The coupling distance can be up to centimeter scale, limited by the cavity size. Our proposal provides a pave way to manipulate solid spins with cavity-magnon polaritons.

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