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Electron non-stationary tunnelling dynamics is probed by the attoclock with the two-colour phase-of-phase photoelectron spectroscopy. Contrary to the case of static tunnelling, angle-to-time mapping in attoclock is found to be not angularly uniform.
The second-harmonic spatiotemporal orbital angular momentum of an optical pulse and its space–time topological charge conservation during frequency doubling are experimentally observed, opening opportunities for nonlinear conversion and scaling of photons carrying spatiotemporal orbital angular momentum.
Structured beams of light are used to engineer conduction band populations and pattern currents. Using the approach, dynamic optoelectronic interconnects and other applications are demonstrated.
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.
An optically synchronized precision fibre link based on two independent chip-scale cavity-stabilized stimulated Brillouin scattering lasers is demonstrated. An ultralow 3 × 10−4 rad2 residual phase error variance is achieved between the mutually coherent transmit and receive lasers.
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.
Researchers coupled exciton–polariton modes to one another in a six-fold symmetric microcavity with loss manipulation and observed room-temperature polaritonic parity-time-reversal symmetry.
Twin-field quantum key distribution over 600 km is demonstrated. The key ingredient for success is the dual-band phase stabilization that dramatically reduce the phase fluctuations on optical fibre by more than four orders of magnitude.
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.
Mid-infrared polarization detectors based on nanoantenna-mediated few-layer graphene are demonstrated. By tuning the orientation of nanoantennas, the polarization ratios vary from positive to negative, and cover values from 1 to ∞/−∞ then to −1.
A three-step staircase avalanche diode was demonstrated and pre-cited gain scaling was confirmed. The technology may be considered as a solid-state analogue to the photomultiplier tube.
Subcycle nano-videography of charge-transfer dynamics in WSe2/WS2 heterostructures is obtained by using a terahertz near-field microscopy. The central idea is to probe the local polarizability of electron–hole pairs with evanescent terahertz fields.
By adding a carefully designed amplification section in a passive resonator, but pumping it below the lasing threshold, ultra-stable high-power cavity solitons can be formed, effectively removing the important barrier of having to work in low-loss environments.
Indistinguishable photon pairs are generated via four-wave mixing in a two-dimensional array of ring resonators that exhibit topological edge states. They show tunable spectral−temporal correlations and robustness against fabrication disorders.
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.