Articles

Photonic radar is exploited for non-contact vital sign detection with a demonstration on a cane toad with a view to application in humans. Optical signals generated from the system are also explored for LiDAR-based vital sign detection, which may yield improved accuracy and system robustness.

Two-photon excitation with mid- and near-infrared pulses encodes bond selectivity in fluorescence imaging. Single-molecule imaging and spectroscopy is demonstrated on individual fluorophores as well as various labelled biological targets.

Large perovskite nanocrystals are synthesized to increase the cryogenic exciton radiative rate. At liquid helium temperatures, single photons from perovskite nanocrystals coalesce at a beam splitter, signalling the existence of indistinguishable photon emission.

A special-purpose quantum simulator, based on a coherently controlled broadband quantum frequency comb produced in a chip-scale dynamically modulated monolithic lithium niobate microresonator, is demonstrated, opening paths for chip-scale implementation of large-scale analogue quantum simulation and computation in the time–frequency domain.

An optoelectronic synapse is realized by incorporating a photoactive layer in an organic electrochemical transistor. Writing and erasing multiple conductance states allow optical signals to be recognized and the learning process of the human brain to be mimicked.

An integrated electro-optic isolator on thin-film lithium niobate enables non-reciprocal isolation by microwave-driven travelling-wave phase modulation. The isolator exhibits a maximum optical isolation of 48.0 dB at around 1,553 nm and an on-chip insertion loss of 0.5 dB.

A deterministic single-photon two-qubit SWAP gate between polarization and spatial-momentum is demonstrated on a silicon chip. A two-qubit swapping process fidelity of 94.9% is obtained. The coherence preservation of the SWAP gate process is verified by two-photon interference.

A common belief about boson bunching—fully indistinguishable bosons exhibit the utmost bunching—is theoretically disproved with seven photons of distinct polarization in a seven-mode interferometric process. Enhanced bunching could thus be observed with partially distinguishable photons.

Super-resolution imaging based on autocorrelation with two-step deconvolution (SACD) enables recording super-resolution images with 128-nm spatial resolution over a field of view of 2.0 mm × 1.4 mm within a 10-min acquisition time.

The use of a nanopillar lattice and orbital angular momentum provides control over the directionality of light emission on the nanoscale.

A new nonlinear optical crystal offers efficient harmonic generation in the ultraviolet and deep-ultraviolet regions.

Introduction of a diffractive axicon in a pulse shaper enables imparting topological–spectral correlation to ultrafast pulses over 200 nm in the visible region and with topological charges up to 80.

Strong-field approximation theory is extended to account for non-classical driving light. This extended theory predicts that ultrafast dynamics of strongly light-driven matter significantly depends on the quantum state of the driving light, particularly on its photon statistics.

By tuning the spatial width, the strength and the frequency of a pump beam in two-dimensional cylindrical microcavities supporting stable, robust photonic snake states, a set of broadband and perfectly synchronized two-dimensional frequency combs can be realized.

To bridge the ultrafast and slow classes of quantum-information-processing systems, a Fresnel time lens is developed by using a wideband electro-optic phase modulator combined with a dispersion element. The single-photon spectral bandwidth is compressed from picosecond to nanosecond timescales.

Propagators of single photons based on directly measuring quantum wave functions are experimentally observed. Classical trajectories that satisfy the principle of least action are successfully extracted in the case of free space and harmonic potential.

Detection of gas radionuclides is limited in sensitivity with present methods, but may be useful in energy, security, medical and other sectors. In this work, gas-concentrating porous scintillating metal–organic frameworks are demonstrated for gas radionuclide detection.

We demonstrate an avalanche photodiode design using photon-trapping structures to enhance the quantum efficiency and minimizing the absorber thickness, yielding high quantum efficiency, suppressed dark current density and bandwidth of ~7 GHz.

We show perovskite X-ray detection at zero-voltage bias with operational device stability exceeding one year. Detection efficiency of 88% and noise-equivalent dose of 90 pGyair are obtained with 18 keV X-rays, allowing single-photon-sensitive, low-dose and energy-resolved X-ray imaging.

Spatial light modulator-based lithography-free programmable light transmission through optical gain medium is demonstrated for optical switching and a rudimentary photonic neural network.