Quantum illumination based on cavity-optomagnonics system with Kerr nonlinearity

Area of Science:

• Quantum optics
• Quantum sensing
• Cavity optomagnonics

Background:

• Quantum illumination uses entangled sources for detecting low-reflectivity objects in bright thermal backgrounds.
• Hybrid cavity-optomagnonics systems, utilizing Yttrium Iron Garnet (YIG) spheres, offer potential for quantum illumination by coupling microwave and optical fields.

Purpose of the Study:

• To propose and investigate a scheme for enhancing entanglement between microwave and optical cavity output fields in a hybrid optomagnonic system.
• To analyze the impact of YIG's intrinsic Kerr nonlinearity versus optomagnonical parametric-type coupling on entanglement enhancement.

Main Methods:

• Theoretical proposal of a scheme leveraging YIG's intrinsic Kerr nonlinearity.
• Comparative analysis of Kerr nonlinearity and optomagnonical parametric-type coupling effects on entanglement.
• Investigation of entanglement properties under feasible experimental parameters.

Main Results:

• Large optomagnonical parametric-type coupling does not necessarily lead to greater entanglement.
• YIG's intrinsic Kerr nonlinearity monotonically improves entanglement for the studied parameters.
• The proposed scheme, considering magnon Kerr nonlinearity, improves signal-to-noise ratio and reduces detection error probability.

Conclusions:

• Intrinsic Kerr nonlinearity in YIG is a crucial factor for enhancing entanglement in hybrid cavity-optomagnonic quantum illumination systems.
• The findings suggest practical improvements for quantum sensing applications using current experimental capabilities.