Cavity magnomechanical storage and retrieval of quantum states

Abstract

We show how a quantum state in a microwave cavity mode can be transferred to and stored in a phononic mode via an intermediate magnon mode in a magnomechanical system. For this we consider a ferrimagnetic yttrium iron garnet (YIG) sphere inserted in a microwave cavity, where the microwave and magnon modes are coupled via a magnetic-dipole interaction and the magnon and phonon modes in the YIG sphere are coupled via magnetostrictive forces. By modulating the cavity and magnon detunings and the driving of the magnon mode in time, a Stimulated Raman Adiabatic Passage (STIRAP)-like coherent transfer becomes possible between the cavity mode and the phonon mode. The phononic mode can be used to store the photonic quantum state for long periods as it possesses lower damping than the photonic and magnon modes. Thus our proposed scheme offers a possibility of using magnomechanical systems as quantum memory for photonic quantum information.

Dynamical Backaction Magnomechanics

“…Furthermore, an important triple-resonance condition is possible, where the phonon frequency matches the difference in frequencies between the hybrid cavity-magnon modes [22], allowing selective cavity enhancement of scattering processes. This triple-resonance system has sparked significant interest, resulting in theoretical proposals for the generation of non-classical entangled states [23][24][25][26][27][28], squeezed states [29][30][31], classical and quantum information processing [32][33][34][35][36], quantum correlation thermometry [37], and exploring PT -symmetry [38][39][40][41]. Many of these proposals rely on the ability of the external drive to act on the mechanical motion, so called dynamical backaction.…”

Optical sensing of magnons via the magnetoelastic displacement

“…We consider the situation where the frequency of the phonon mode is much lower than that of the magnon mode [9,22,23], such that they couple via a radiation pressure-like dispersive interaction. Such a nonlinear coupling has been recognized as a cornerstone of many quantum protocols [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. Relevant experiments have demonstrated magnomechanically induced transparency/absorption [22] and mechanical cooling/lasing [23].…”

Accelerated adiabatic passage in cavity magnomechanics

“…Active investigations about magnon-based quantum information transfer focus on the coupling between photons and magnons and that between magnons and phonons in the ferrimagnetic material. Typical applications of these couplings include the hybrid entanglement and steering [22][23][24][25], the photonphonon interface [26,27], and the magnomechanical phonon laser [28].…”

“…That enables the storage-and-transfer of the microwave photonic and magnonic states as long-lasting modes, constituting a key step for the future quantum communication networks [29]. Inspired by the light-matter interface implemented within the cavity QED [30,31], the optomechanical systems [32][33][34], and the optical waveguides [35], * jingjun@zju.edu.cn the stimulated Raman adiabatic passage between photon and phonon [27] and the magnon-assisted photonphonon conversion [26] have been proposed in the cavity magnomechanical systems. These protocols however demand a long evolution time and then the quantum system is prone to decoherence.…”