In the present work, we experimentally demonstrate a suspended tunable subwavelength nanobeam cavity based on our recently proposed advanced dielectric bow-tie design combining ultra-low mode volume and high Q-factor. The nanobeam cavity is efficiently coupled to waveguide ports, allowing full integration with the existing silicon photonic platform and mitigation of the detuning between the optical mode and quantum emitter, which inevitably appears in a coupled system of an emitter and cavity due to fabrication disorder. The tunability of the nanobeam cavity is achieved through nanoelectromechanical actuation using electrostatic comb-drive actuators. The proposed bow-tie nanobeam cavity supports a fundamental optical mode confined in solid in the telecom C-band with a normalized mode volume below 0.12 and Q-factor of 3500. By applying the voltage to the comb-drive actuators, we experimentally observe the dynamic reconfigurability of the cavity resonance wavelength within 11 nm. Our findings can open a new prospect for efficient and tunable nanodevices for enhanced light-matter interactions.
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.
Thin Film Lithium Niobate (TFLN) photonic integrated circuits offer several improvements over other platforms in terms of material loss, energy efficiency, and operational bandwidth. We review our recent demonstration of quadrature phase shift keying in an ultrasmall TFLN photonic crystal-based IQ modulator. Our modulator features a footprint of 40 × 200 μm2 along with quality factors approaching 105 providing it with a Vπ = 1.16 V [H. Larocque et al. CLEO 2023, paper STh1R.3; H. Larocque et al. arXiv:2312.16746]. We discuss an extension to and optimization of quadrature amplitude modulation encoding schemes tailored to the device’s voltage response, including the use of a deep neural network for streamlining bit error rate minimization.
A central goal in photonic quantum information processing is the ability to perform high-fidelity logic gates between multiple optical qubits. Here, we present our recent theoretical work on using optical nonlinearities to implement controlled-phase gates between two optical qubits. Our approach is based on using dynamically coupled cavities to convert photons travelling in a waveguide into highly confined cavity modes. This conversion enables very strong interactions between photons in quasi-monochromatic modes, which enables high fidelity gates. We will discuss gate protocols based on second- and third order nonlinear materials as well as interactions with two-level emitters.
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