We present numerical simulations of deep reinforcement learning on a measurement-based quantum processor—a time-multiplexed optical circuit sampled by photon-number-resolving detection—and find it generates squeezed cat states with an average success rate of 98%, outperforming all other similar proposals.
We present in situ tuning of both the absolute and relative frequency spacing of the modes in an optical microcavity by incorporating a wedged diamond membrane. We demonstrate THz continuous tuning of doubly-resonant Raman scattering.
Quantum optics has advanced our understanding of the nature of light and enabled applications far beyond what is possible with classical light. The unique capabilities of quantum light have inspired the migration of some conceptual ideas to the realm of classical optics, focusing on replicating and exploiting non-trivial quantum states of discrete-variable systems. Here, we further develop this paradigm by building the analogy of quantum squeezed states using classical structured light. We have found that the mechanism of squeezing, responsible for beating the standard quantum limit in quantum optics, allows for overcoming the "standard spatial limit" in classical optics: the light beam can be "squeezed" along one of the transverse directions in real space (at the expense of its enlargement along the orthogonal direction), where its width becomes smaller than that of the corresponding fundamental Gaussian mode. We show that classical squeezing enables nearly sub-diffraction and superoscillatory light focusing, which is also accompanied by the nanoscale phase gradient of the size in the order of λ/100 (λ/1000), demonstrated in the experiment (simulations). Crucially, the squeezing mechanism allows for continuous tuning of both features by varying the squeezing parameter, thus providing distinctive flexibility for optical microscopy and metrology beyond the diffraction limit and suggesting further exploration of classical analogies of quantum effects.
Supersymmetry provides a new paradigm for transformation optics. We experimentally demonstrate broadband continuous supersymmetric transformation by designing a novel metamaterial on a Si platform for advanced control of the spatial characteristics of light.
We have developed the fiber-based speckle contrast optical spectroscopy (SCOS) system to measure human cerebral blood flow (CBF) and brain functions, and demonstrated that SCOS outperforms traditional diffuse correlation spectroscopy (DCS) systems.
We demonstrate the generation of single-cycle THz pulses intracavity of a modelocked thin-disk laser using a simple and cost-efficient 50-µm thin LiNbO3 plate, reaching 1.2 mW THz average power from a compact and efficient setup.
We experimentally demonstrate that broadband THz imaging can provide virtually unimpaired visibility through dense fog that would otherwise result in zero visibility under conventional optical imaging.
We report on the fabrication of form birefringent structures using 3D laser printing technique and describe optical properties of the fabricated samples. By employing 3D periodic structures instead of the simple 1D gratings that are typically used, we were able to realize mechanically robust form birefringent structures whose thickness and optical length of the birefringent region can be increased without loss of the mechanical stability, and achieve the quarter- and half-wave phase retardation levels needed in many applications. In the future, similar structures may become useful as the building blocks of polymeric photonic devices.
On-chip nonlinear waveguides can simultaneously exhibit quadratic and cubic nonlinearities and enable supercontinua across multiple-octaves. An efficient, open-source numeric approach for simulating ultra-broadband spectra from mixed and cascaded (quadratic and cubic) nonlinear processes is presented.
We describe a wafer level fabrication process for evacuated Rb vapor cells. By etching channels on the wafer surface around the cell positions, we demonstrate wafers of cells with residual gas pressures below 5 mbar.
We demonstrate degenerate optical parametric oscillation in a triple-state silicon nitride photonic molecule. DOPO is generated with a phase-coherent dual-tone pump scheme, and the phase-matching conditions are optimized by tuning the resonances with microheaters.
We demonstrate a lensless volumetric imaging microendoscope for deep-brain fluorescence microscopy. It consists of a nanophotonic neural probe for light-sheet illumination and an image fiber bundle for light-field fluorescence collection.
Time-resolved mid-infrared photothermal imaging via boxcar gating is presented for the study of interface dynamics between axon bundles and the surrounding water.
We demonstrate high-power, single-mode operation of 1.3-μm-wavelength InP-based photonic-crystal surface-emitting lasers. At room temperature, output powers of over 250 mW under continuous-wave conditions and over 8.5 W under pulsed conditions are achieved.
