Abstract
Diamond hosts optically active color centers with great promise in quantum computation, networking, and sensing. Realization of such applications is contingent upon the integration of color centers into photonic circuits. However, current diamond quantum optics experiments are restricted to single devices and few quantum emitters because fabrication constraints limit device functionalities, thus precluding color center integrated photonic circuits. In this work, we utilize inverse design methods to overcome constraints of cutting-edge diamond nanofabrication methods and fabricate compact and robust diamond devices with unique specifications. Our design method leverages advanced optimization techniques to search the full parameter space for fabricable device designs. We experimentally demonstrate inverse-designed photonic free-space interfaces as well as their scalable integration with two vastly different devices: classical photonic crystal cavities and inverse-designed waveguide-splitters. The multi-device integration capability and performance of our inverse-designed diamond platform represents a critical advancement toward integrated diamond quantum optical circuits.
Highlights
Diamond hosts optically active color centers with great promise in quantum computation, networking, and sensing
We illustrate the integration of such a vertical coupler into a diamond photonic circuit consisting of two nanobeam resonators connected via inverse-designed waveguide-splitters—a configuration that could be used to entangle two quantum emitters embedded inside such resonators
Similar approaches with hybrid structures, such as gallium phosphide (GaP) membranes on diamond, offer a platform for efficient grating couplers[37]
Summary
Diamond hosts optically active color centers with great promise in quantum computation, networking, and sensing Realization of such applications is contingent upon the integration of color centers into photonic circuits. State-of-theart diamond cavity quantum photonics relies on angled-etching of bulk diamond[24] This technique naturally leads to triangular cross-sections with strongly constrained geometries, which limit device design and functionality. We overcome these fabrication and design challenges by employing inverse design methods In silicon nanophotonics these methods have recently attracted considerable attention for their efficient design of devices with superior performance over conventional designs[29]. This optimization technique searches through the full parameter space of fabricable devices, thereby arriving at solutions previously inaccessible to traditional design techniques[30]. We illustrate the integration of such a vertical coupler into a diamond photonic circuit consisting of two nanobeam resonators connected via inverse-designed waveguide-splitters—a configuration that could be used to entangle two quantum emitters embedded inside such resonators
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