Room-temperature steady-state optomechanics entanglement on a chip

TL;DR

This paper proposes a silicon nitride-based system capable of generating steady-state optomechanical entanglement at room temperature, highlighting the importance of dispersive coupling and material quality for practical quantum applications.

Contribution

It introduces a novel chip-based design for room-temperature optomechanical entanglement using dispersive coupling in SiN structures, with analysis of temperature and quality factor effects.

Findings

Room-temperature entanglement depends on the ratio T/Qm.

Dispersive coupling effectively generates entanglement at high temperatures.

Material and structural improvements can enhance entanglement efficiency.

Abstract

A potential experimental system, based on the Silicon Nitride (SiN) material, is proposed to generate steady-state room-temperature optomechanical entanglement. In the proposed structure, the nanostring interacts dispersively and reactively with the microdisk cavity via the evanescent field. We study the role of both dispersive and reactive coupling in generating optomechanical entanglement, and show that the room-temperature entanglement can be effectively obtained through the dispersive couplings within the reasonable experimental parameters. In particular, we find, in the high Temperature ($T$) and high mechanical qualify factor ($Q_{m}$) limit, the logarithmic entanglement depends only on the ratio $T/Q_{m}$. This means that improvements in the material quantity and structure design may lead to more efficient generation of stationary high-temperature entanglement.