Photonic integrated circuits provide a scalable platform for photonics-based quantum technologies. However, integrating quantum emitters and electro-optic cavities within this platform remains an open challenge proving to be a major hurdle from implementing key functionalities for quantum photonics, such as single photon sources and nonlinearities. Here, we address this shortcoming with the hybrid integration of InAs/InP quantum dot emitters on foundry silicon photonics and the implementation of photonic crystal cavities in thin-film lithium niobate. Co-integrated on-chip electronics allow us to tune the emission properties of the quantum dots while enabling GHz-rate coherent modulation over photons trapped in the cavities, thus providing a new level of programmability over interactions between optical fields and atom-like systems in integrated circuits. Our results open the door to a new generation of quantum information processors that can be manufactured in leading semiconductor foundries.
T centers in silicon could serve as efficient quantum memories based on spin-photon interface. But these emitters have long excited state lifetimes and are therefore dim. We demonstrate high-efficiency single photon emission from the zero-phonon line of a single T center using a nanobeam. The tapered nanobeam features coupling efficiency of 71% into a lensed fiber, enabling an order of magnitude improvement in photon count rates as compared to previously reported values. Consequently, we demonstrate single photon emission from the zero-phonon line, representing the coherent emission from the T center. Our result is an important step towards CMOS-integrated spin-photon interfaces.
In this study, we demonstrate the improvement of quality factors in InP nanobeam cavities using atomic layer deposition (ALD). By depositing a small amount of Al2O3 thin films on the cavities, we achieve up to 140% enhancement in quality factors. This advancement in cavity quality factors holds promise for optimizing InP nanobeam cavities when incorporating active materials like quantum dots and quantum wells, enabling widespread utilization across diverse photonic applications.
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