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Direct generation of few-cycle high-energy visible pulses is demonstrated via the nonlinear mixing of hollow-core fibre modes. Compression of near-infrared laser pulses by a factor of 40 with no additional dispersion compensation delivers 4.6 fs, 20 μJ pulses (~2 cycles, ~4 GW peak power) centred at around 600 nm.
Non-magnetic optical isolators are demonstrated using phonon-mediated photonic Autler–Townes splitting. The on-chip lithium niobate devices simultaneously achieve ultralow insertion loss and high contrast.
Multiplexing orbital angular momentum states as independent and orthogonal information carriers for data encryption is realized through disorder-induced synthetic helical dichroism in disordered nanoaggregates.
Quantum teleportation of a photonic qubit into mechanical modes of two silicon photonic crystal nanobeams is demonstrated. It allows to store and retrieve an arbitrary qubit state onto a dual-rail encoded long-lived optomechanical quantum memory.
Perovskite crystals of Cs4PbBr6 embedded with CsPbBr3 nanocrystals are shown to act as wideband, achromatic waveplates in the visible and near-infrared regions.
Solution-processed infrared lasers that operate at room temperature are a challenge, but now researchers have achieved such a device using colloidal quantum dots.
Strong lanthanide-doped upconversion luminescence enhancement is achieved by the use of surface molecules which enhance four-photon upconversion emission. The results may lead to new, highly emissive, nanohybrid systems.
A field test of twin-field quantum key distribution was implemented through a 511 km optical fibre. To this end, precise wavelength control of remote independent laser sources and fast time- and phase-compensation systems are developed.
A collective coherent quantum many-body phase, namely superfluorescence, is observed in CH3NH3PbI3 at 78 K. The excitation fluence dependence of the spectroscopic features and the population kinetics confirm all its well-known characteristics.
Experimental and theoretical results of wave propagation in a disordered system with non-Hermitian disorder are presented, showing that wave spreading occurs in the parameter regime where all eigenstates are expected to be localized.
An interferometric technique is developed to measure the particle exchange phase of indistinguishable photons. The exchange phase obtained is (−0.04 ± 0.07) radians, which clearly demonstrates the symmetric nature of the two-photon wave functions.
A nondestructive and complete Bell-state measurement is demonstrated between two 60-m-distant atomic qubits in different optical cavities. The main building block is a photon-atom gate, which is executed upon reflection of the photon from the cavity.
A simple coating of a sub-200-nm-thick quantum dot film on two-dimensional materials can drastically enhance their nonlinear optical responses through nonlinear-excitation resonance energy transfer by a high-efficiency remote dipole–dipole coupling.
A four-wave mixing technique is developed in the hard X-ray range. A diamond phase grating in an X-ray beam path creates a periodic excitation pattern on a sample via the Talbot effect. The response of the periodic excitation is probed by an optical pulse.
The concept of scattering invariant modes is introduced to produce the same transmitted field profiles through a multiple scattering sample and a reference medium. Their correlations with the ballistic light can be used to improve imaging inside scattering materials.
By converting Li-ion battery into an optical device using graphene electrodes, an electrochemical optical device which enables colour changing ability over the entire wavelength range from visible to microwave is demonstrated.
A relativistic electron beam with 1.9 pC charge is accelerated by copropagating with a terahertz pulse through two dielectric-loaded waveguides. The accelerating gradient in a single dielectric-loaded waveguide is 85 MV m−1. The total energy gain is 204 keV.
Ultralow-noise erbium:fibre comb technology allows the generation of a comb spanning six octaves, from the ultraviolet (350 nm) to the mid-infrared (22,500 nm), with a resolving power of 1010 across 0.86 PHz of bandwidth.
An optical ultrasound sensor based on a CMOS-compatible split-rib waveguide is demonstrated, offering high sensitivity, broadband detection (measured 3–30 MHz), small size (20 μm) and scalability to a fine-pitch matrix.
The counterpart of superradiance, called superabsorption, has now been observed. Superabsorption rates are much higher than that of ordinary absorption and may enable weak-signal exploitation.