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Physical review. B./Physical review. B

Magnon-atom interaction via dispersive cavities: Magnon entanglement

Deyi Kong, Xiangming Hu, Liang Hu, Jun Xu

Published Jun 15, 2021• 33 citations
Publisher

Abstract

In general, a magnon does not interact directly with an atom. Here we present a scheme to generate coherent coupling between two magnons and a superconducting artificial atom via exchange of virtual photons in dispersive cavities. By probing into the induced magnon-atom interactions, we identify the two-magnon process, which causes almost perfect two-mode squeezing and entanglement of the two magnons for specific conditions. The quantum entanglement of the magnon modes in two massive ferrimagnets survives at the steady state and represents genuinely macroscopic quantum state. Our work offers an interesting alternative in designing experiments for generating the coherent coupling between the magnons and the atom. It finds broad applications in the investigation of macroscopic quantum effects and the preparation of quantum devices.

DOI
10.1103/physrevb.103.224416

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In general, a magnon does not interact directly with an atom. Here we present a scheme to generate coherent coupling between two magnons and a superconducting artificial atom via exchange of virtual photons in dispersive cavities. By probing into the induced magnon-atom interactions, we identify the two-magnon process, which causes almost perfect two-mode squeezing and entanglement of the two magnons for specific conditions. The quantum entanglement of the magnon modes in two massive ferrimagnets survives at the steady state and represents genuinely macroscopic quantum state. Our work offers an interesting alternative in designing experiments for generating the coherent coupling between the magnons and the atom. It finds broad applications in the investigation of macroscopic quantum effects and the preparation of quantum devices.
Abstract We present a scheme to entangle two magnon modes in a cavity magnomechanical system. The two magnon modes are embodied by collective motions of a large number of spins in two macroscopic ferrimagnets, and couple to a single microwave cavity mode via magnetic dipole interaction. We show that by activating the nonlinear magnetostrictive interaction in one ferrimagnet, realized by driving the magnon mode with a strong red-detuned microwave field, the two magnon modes can be prepared in an entangled state. The entanglement is achieved by exploiting the nonlinear magnon-phonon coupling and the linear magnon-cavity coupling, and is in the steady state and robust against temperature. The entangled magnon modes in two massive ferrimagnets represent genuinely macroscopic quantum states, and may find applications in the study of macroscopic quantum mechanics and quantum information processing based on magnonics.
We propose an efficient scheme to realize almost perfect higher-order squeez-ing of two YIG spheres via microwave-mediated magnon-atom interactions. Itis assumed that two microwave cavity modes are coupled to two YIG spheresby the magnetic dipole interaction and a superconducting artificial atom bythe electric dipole interaction, respectively. When the microwave cavity fieldsare tuned to be far detuned from the dressed atomic Rabi sidebands and themagnon frequencies, the coherent coupling between two magnons and the arti-ficial atom can be established via virtual photon exchange. We find that a pairof Bogoliubov modes composed of two magnon modes are cooled to the vacuumstate through the atomic engineered dissipation, resulting in an ideal two-modehigher-order squeezing state of the YIG spheres. The solid-state device mayfind realistic applications in high-precision measurement and quantum sensingtechnology.
We propose a scheme to generate entanglement between magnon and superconducting qubit. The macroscopic yttrium–iron–garnet sphere and superconducting qubit are installed in two spatially separated cavities, which are directly driven by a two-mode squeezed-vacuum microwave field. The magnon and cavity 1 are coupled via magnetic dipole interaction and the superconducting qubit and cavity 2 are coupled via electric dipole interaction. We theoretically demonstrate that the magnon–qubit steady-state entanglement can be created by transferring quantum correlations of the two-mode squeezed-vacuum driving field via cavity–magnon and cavity–qubit beam-splitter interactions. The transfer is highly efficient, and the entanglement is robust against temperature in the optimal parameter regimes. We also deduce a new, to the best of our knowledge, mathematical method to analyze the dynamics of the magnon–qubit entanglement and some significant results are obtained. Our scheme can be implemented with experimentally feasible parameters and may provide guidance in designing hybrid quantum networks.
Generation of entanglement between spatially separated macroscopic systems enables quantum networks and fundamental tests of quantum theory. Here, we propose a scheme to generate a long-range entangled state between two macroscopic spheres. The hybrid system under consideration consists of two massive ferromagnetic spheres and a superconducting transmon qubit, which are both coupled to a microwave cavity array. When the qubit or magnon frequency lies outside of the frequency band of the cavity array, the qubit or magnon mode can seed a tunable, localized cavity mode with an exponentially decaying envelope around its position. This effective cavity mediates the long-range qubit-magnon and magnon-magnon interactions in a coherent way, enabling the long-distance magnon-magnon entanglement via the superconducting qubit.
Here we show that it is possible to control magnon-magnon entanglement in a hybrid magnon-atom-cavity system based on atomic coherence. In a four-level V-type atomic system, two strong fields are applied to drive two dipole-allowed transitions and two microwave cavity modes are coupled with two dipole forbidden transitions as well as two magnon modes simultaneously. It is found that the stable magnon-magnon entanglement, one-way steering and two-way EPR steering can be generated and controlled by atomic coherence according to the following two points: (i) the coherent coupling between magnon and atoms is established via exchange of virtual photons; (ii) the dissipation of magnon mode is dominant over amplification since one of the atomic states mediated one-channel interaction always keeps empty. The coherent control of magnon-magnon correlations provides an effective approach to modify macroscopic quantum effects using the laser-driven atomic systems.
ABSTRACT The realization of coherent coupling between two distinct systems within a hybrid framework represents an effective approach for exploring the unique properties of quantum mechanics. In this paper, we construct a hybrid cavity‐magnon system to achieve coherent coupling between a magnon and two atoms, assisted by the cavity field, when the magnon mode frequency is tuned to nearly twice the atomic transition frequency. This coherent coupling corresponds to the simultaneous excitation of two atoms by a single magnon mode, mediated by virtual states through counter‐rotating processes. Furthermore, this proposal can be directly applied to generate hybrid entanglement among the individual subsystems. A significant characteristic is that the cavity serves merely as a medium that is not effectively excited; therefore, decoherence effects caused by cavity leakage can be substantially suppressed. Moreover, this interaction is reciprocal, allowing two atoms in their ground states to simultaneously absorb one magnon and transition to their excited states, as well as allowing two atoms in their excited states to jointly emit a single magnon. Finally, we demonstrate that this simultaneous joint absorption and emission process can also occur when the two atoms are non‐identical.