Cavity magnomechanical storage and retrieval of quantum states

TL;DR

This paper proposes a scheme to transfer and store quantum states from microwave cavity modes to phononic modes via magnons in a YIG sphere, enabling long-term quantum memory using magnomechanical systems.

Contribution

It introduces a STIRAP-like protocol for coherent quantum state transfer in a magnomechanical system, demonstrating potential for quantum memory applications.

Findings

Successful transfer of quantum states between cavity and phonon modes.

Long-term storage potential due to lower phononic damping.

Feasibility of using magnomechanical systems for quantum information storage.

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.