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Phase-matching quantum key distribution is implemented with a 502 km ultralow-loss optical fibre. The fluctuations of the laser initial phases and frequencies are suppressed by the laser injection technique and the phase post-compensation method.
Knowledge about detection latency provides a guideline to reduce the timing jitter of niobium nitride superconducting nanowire single-photon detectors. A timing jitter of 2.6 ps at visible wavelength and 4.3 ps at 1,550 nm is achieved.
The combination of high-order harmonic polarimetry and sub-cycle control of electronic trajectories gives insight into the birth of attosecond electronic wave packets in molecules.
Registration fees, travel costs and visas, and time away from home and the lab, are all factors that can make attending scientific meetings in person difficult. Can online conferences provide a solution?
A new light-field imaging scheme, employing stacks of transparent graphene photodetectors, has been demonstrated, providing a path to greatly simplify the otherwise complex three-dimensional imaging.
Carbon-dot-based light-emitting diodes with narrowband efficient emission in the deep blue are an attractive candidate for future high-colour-purity flat-panel display and lighting applications.
By applying a spiral phase in a pulse shaper, a three-dimensional wave packet, which is a spatiotemporal optical vortex with a controllable purely transverse orbital angular momentum, is demonstrated.
Strong electrorefractive effects in semiconductor transition metal dichalcogenides (TMDs) at near-infrared wavelengths, where the TMDs are transparent, are observed and used to demonstrate photonic devices based on a composite SiN–TMD platform with large phase modulation, minimal induced loss and low electrical power consumption.
A luminescent photonic substrate with a controlled angular emission profile is introduced and its ability to generate high-contrast dark-field images of micrometre-sized living organisms is demonstrated using standard optical microscopy equipment.
Vertical integration of a metalens to realize compound nanophotonic systems for optical analog image processing is realized, significantly reducing the size and complexity of conventional optical systems.
A Sagnac gyroscope based on Brillouin ring lasers on a silicon chip is presented. The stability and sensitivity of this on-chip planar gyroscope allow measurement of the Earth’s rotation, with an amplitude sensitivity as small as 5 deg h−1 for a sinusoidal rotation, an angle random walk of 0.068 deg h−1/2 and bias instability of 3.6 deg h−1.
A heralded squeezing gate with near unit fidelity is demonstrated, even for modest ancillary squeezing. A heralding filter is implemented in the feed-forward operation. With 6 dB of ancillary squeezing, a fidelity of 0.985 is experimentally obtained.
The photoluminescence spectrum of WS2 is modified under strain applied by an atomic force microscope probe. The free carrier redistribution yields conversion of excitons to trions with conversion efficiency approaching 100%.
Einstein–Podolsky–Rosen entangled beams are sent to a 0.5-m-long optical resonator. To reduce quantum noise in a frequency-dependent manner in the gravitational detector, two-mode frequency-dependent squeezed vacuum states are generated.
Einstein–Podolsky–Rosen entangled beams are sent to a 2.5-m-long cavity mimicking the signal recycling cavity of a gravitational-wave detector. By controlling the wavelength detuning, frequency-dependent squeezed vacuum states were generated.
Using a femtosecond mode-locked laser and a frequency-locked electric signal, a displacement measurement method that offers a >MHz measurement speed, sub-nanometre precision and a measurement range of more than several millimetres is achieved, facilitating the study of broadband, transient and nonlinear mechanical dynamics in real time.
A single-molecule attosecond interferometry that can retrieve the spectral phase information associated with the structure of molecular orbitals, as well as the phase accumulated by an electron as it tunnels out, is demonstrated.
