Device-Independence is the ultimate goal of the realistic security of quantum information, but violating Bells inequality is difficult and complex. We have implemented the first on-chip SDI-QRNG in the whole DI/SDI field, paving the way for large-scale secure utilization of quantum resources at room temperature.
An ultrafast autofocus method for microscopy by Fourier single-pixel imaging via maximizing frequency component magnitude. It is imaging-free and is derived from the physical mechanism, making it highly attractive for autofocusing transparent samples under non-visible illumination.
Silicon photonic spectrometer with multiple customized wavelength-bands incorporated with wideband/narrowband optical filters shows great potential for various applications, including gas monitors, wearable biosensors, portable spectral-domain optical coherence tomography and so on.
Tunability, ultracompact design, high group index, low loss, and broad bandwidth are desired properties for integrated optical delay lines (ODLs). However, those properties are challenging to achieve simultaneously in the visible region. This paper proposed a tunable hexagonal boron nitride (hBN) topological optical delay lines (TODLs) in the visible region based on valley photonic crystals (VPC). The topological edge state from the beard-type boundary allows the achievement of an ultralow group velocity close to zero, which results in a large group index of 629 at 645 nm. Moreover, we demonstrate tuning the slow light wavelength and optical delay times with electrically tunable liquid crystals by applying external voltage. The device has an ultracompact size of 5 μm×2.7 μm with an optical delay distance of 25a and a delay time of 12 ps. Our design can provide a new possibility for designing ODLs worked in the visible region for optical communication and quantum computing systems
In this study, we developed a hollow aerogel fiber out of reduced graphene oxide (rGO), with a hierarchically ordered microstructure through a three-dimensional coaxial printing methodology, that enabled a physicochemically cooperative construction process at multiscale.
