Nanoscopic charge fluctuations in a gallium phosphide waveguide measured by single molecules

Cavity optomechanics in gallium phosphide microdisks

We demonstrate gallium phosphide (GaP) microdisk optical cavities with intrinsic quality factors $ > 2.8\times10^{5}$ and mode volumes $< 10 (λ/n)^3$, and study their nonlinear and optomechanical properties. For optical intensities up to $8.0\times10^4$ intracavity photons, we observe optical loss in the microcavity to decrease with increasing intensity, indicating that saturable absorption sites are present in the GaP material, and that two-photon absorption is not significant. We observe optomechanical coupling between optical modes of the microdisk around 1.5 $μ$m and several mechanical res…

Ultra-low-noise Microwave to Optics Conversion in Gallium Phosphide

Mechanical resonators can act as excellent intermediaries to interface single photons in the microwave and optical domains due to their high quality factors. Nevertheless, the optical pump required to overcome the large energy difference between the frequencies can add significant noise to the transduced signal. Here we exploit the remarkable properties of thin-film gallium phosphide to demonstrate bi-directional on-chip conversion between microwave and optical frequencies, realized by piezoelectric actuation of a Gigahertz-frequency optomechanical resonator. The large optomechanical coupling …

Microwave-to-optical conversion with a gallium phosphide photonic crystal cavity

Electrically actuated optomechanical resonators provide a route to quantum-coherent, bidirectional conversion of microwave and optical photons. Such devices could enable optical interconnection of quantum computers based on qubits operating at microwave frequencies. Here we present a novel platform for microwave-to-optical conversion comprising a photonic crystal cavity made of single-crystal, piezoelectric gallium phosphide integrated on pre-fabricated niobium circuits on an intrinsic silicon substrate. The devices exploit spatially extended, sideband-resolved mechanical breathing modes at $\…

Gallium phosphide as a piezoelectric platform for quantum optomechanics

Recent years have seen extraordinary progress in creating quantum states of mechanical oscillators, leading to great interest in potential applications for such systems in both fundamental as well as applied quantum science. One example is the use of these devices as transducers between otherwise disparate quantum systems. In this regard, a promising approach is to build integrated piezoelectric optomechanical devices, that are then coupled to microwave circuits. Optical absorption, low quality factors and other challenges have up to now prevented operation in the quantum regime, however. Here…

可扩展的磷化镓-钻石自旋-光子接口

A scalable gallium-phosphide-on-diamond spin-photon interface

该研究展示了在可扩展平面平台上实现高合作度的磷化镓-钻石自旋-光子接口，通过强耦合SiV中心和GaP的非线性特性，为量子网络应用提供新方案。

处于可分辨边带区域的二维磷化镓光力学晶体

A two-dimensional gallium phosphide optomechanical crystal in the resolved-sideband regime

本研究制备并表征了二维磷化镓光力学晶体，在195.6 THz电信频率下实现7.9×10^4的高光学Q因子，其7.7 GHz机械模式超过光学线宽3倍以上，实现450 kHz真空光力学耦合，是低温下长寿命确定性电信光子量子存储器的理想平台。