Integrated technologies represent a key enabling capability for future compact and portable atomic physics systems, including optical clocks and other sensors. In this talk, I will discuss our recent demonstration of high-fidelity detection of the state of a trapped Sr+ ion with a single-photon avalanche detector (SPAD) integrated into a microfabricated surface-electrode trap. Using an adaptive technique, we achieve ion state detection in 450 us with 99.92(1)% average fidelity. I will also discuss ongoing efforts to combine integrated detectors with integrated photonics to enable ion traps that completely eliminate the need for free-space optics for light delivery and collection.
Optical clocks have achieved accuracies better than 1 part in 1018 and are now some of the best measurement devices ever made, significantly surpassing previous-generation microwave clocks in terms of stability. A significant challenge is to transition optical clocks to field environments, which requires the ruggedization and miniaturization of the atomic reference and clock laser along with their supporting lasers and electronics. In this talk, I discuss the use of a stimulated-Brillouin-scattering (SBS) laser based on a compact fiber resonator to run an optical clock, demonstrating a potential portable replacement for the bulk-cavity-stabilized lasers typically used as the stable oscillator in these systems. We achieve a short-term stability of 3.9 x 10-14 in 1 s, outperforming the best microwave clocks. I also discuss our development of integrated photonics and detectors for chip-based ion traps as a pathway towards miniaturizing the clock’s atomic reference through elimination of free-space optics for light delivery and collection.
We demonstrate an integrated photonic platform for control of complex atomic systems. The platform includes multiple waveguide layers and a suite of passive photonic circuit components supporting a wavelength range from 370-1100 nm. In particular, we demonstrate a novel dual-layer vertical grating coupler used for efficiently directing visible light to precise positions above the chip surface. These circuits are compatible with traditional CMOS fabrication techniques and are well suited for improving the scalability of quantum information processing systems based on trapped-ion technology. A chip-scale waveguide platform at visible wavelengths could also prove useful in a variety of bio-photonic and sensing applications requiring precise light delivery or readout in a compact footprint.
We demonstrate a scalable multi-layer integrated photonics platform that operates over a multi-octave wavelength range, from the near-ultraviolet (NUV) to the near-infrared (NIR). The platform is CMOS compatible and consists of silicon nitride (Si3N4) and alumina (Al2O3) optical waveguides cladded with silicon dioxide (SiO2). We demonstrate low-loss waveguides and passive components including diffractive vertical grating couplers for input/output (I/O). The multilayer nature of the platform enables complex routing of multiple wavelengths, making it useful for a variety of applications including integrated atomic-molecular-optical (AMO) and biophotonic systems.
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