[Paper Review] Squeezing Microwave Fields via Magnetostrictive Interaction

Jie Li, Yi‐Pu Wang+2 more|arXiv (Cornell University)|Jan 7, 2021

Mechanical and Optical Resonators1 references4 citations

TL;DR

This paper proposes a cavity magnomechanics platform using nonlinear magnetostrictive interactions in a ferrimagnet to generate stationary, substantial squeezing of microwave fields. By leveraging current cavity electromagnonics technology, the scheme achieves significant quantum noise reduction, enabling practical applications in quantum metrology and quantum information processing.

ABSTRACT

Squeezed light finds many important applications in quantum information science and quantum metrology, and has been produced in a variety of physical systems involving optical nonlinear processes. Here, we show how a nonlinear magnetostrictive interaction in a ferrimagnet in cavity magnomechanics can be used to reduce quantum noise of the electromagnetic field. We show optimal parameter regimes where a substantial and stationary squeezing of the microwave output field can be achieved. The scheme can be realized within the reach of current technology in cavity electromagnonics and magnomechanics. Our work provides a new and practicable approach for producing squeezed vacuum states of electromagnetic fields, and may find promising applications in quantum information processing and quantum metrology.

Motivation & Objective

• To develop a practical method for generating squeezed vacuum states of microwave fields using nonlinear magnetostrictive interactions.
• To identify optimal parameter regimes that enable substantial and stationary squeezing in cavity magnomechanical systems.
• To demonstrate feasibility within existing cavity electromagnonics and magnomechanics technology.
• To enable applications in quantum information processing and quantum metrology through enhanced signal-to-noise performance.

Proposed method

• Utilizes a ferrimagnetic material in a microwave cavity to induce nonlinear magnetostrictive coupling between magnetic and mechanical degrees of freedom.
• Employs cavity magnomechanics to mediate the interaction and enhance field-matter coupling.
• Applies a strong pump field to drive the nonlinear magnetostrictive interaction, generating quantum squeezing.
• Analyzes the system's dynamics using a Hamiltonian model that includes magnon, phonon, and photon modes.
• Derives conditions for optimal squeezing by solving the linearized quantum Langevin equations in the steady state.
• Considers realistic parameters such as cavity quality factor, magnetostrictive coefficient, and temperature to ensure experimental feasibility.

Experimental results

Research questions

• RQ1 Can nonlinear magnetostrictive interactions in a ferrimagnet be harnessed to generate stationary microwave field squeezing?
• RQ2 What are the optimal operating parameters for achieving maximum squeezing in a cavity magnomechanical system?
• RQ3 Is the proposed scheme realizable with current cavity electromagnonics and magnomechanics technology?
• RQ4 How does the system's performance depend on key parameters like pump power and coupling strength?

Key findings

• The scheme enables substantial and stationary squeezing of the microwave output field through nonlinear magnetostrictive coupling.
• Optimal parameter regimes are identified where significant squeezing levels can be achieved under realistic experimental conditions.
• The system remains stable and feasible within current technological capabilities, particularly in terms of cavity quality and material properties.
• The approach provides a robust and scalable platform for generating squeezed vacuum states in the microwave domain.