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Microcavity polaritons—the bosonic quasiparticles that result from strong light–matter coupling—are observed for the first time in a dielectric cavity containing a monolayer of molybdenum disulphide at room temperature.
The authors observe electron interference using the Auger electron emitted from an O2 molecule ionized by a soft X-ray photon. The interference disappears when the location of the O+ can be determined from the final state observed.
Solution-processed small-molecule solar cells with almost 100% internal quantum efficiency and a power conversion efficiency of 9% are reported. The cells make use of a donor molecule called DRCN7T and use PC71BM as an acceptor.
The authors report a semiconductor injection laser with a continuous wave emission spanning more than one octave, from 1.64 THz to 3.35 THz, with optical powers in the milliwatt range and more than 80 modes above threshold.
A nanoaperture tweezer excited by two lasers with slightly different wavelengths is used to trap nanoscopic particles. The beating field that is created allows low-frequency Raman spectra at the single particle level to be measured.
Using a spectroscopy streaking technique at LCLS (Linac Coherent Light Source), researchers demonstrate temporal characterization of X-ray pulses with sub-femtosecond resolution.
A quantum receiver based on photon-number-resolving detection and adaptive feedback is demonstrated. It can discriminate quadrature-phase-shift-keying coherent signals with error below the standard quantum limit.
70,000 diffraction patterns captured over twelve minutes at the Linac Coherent Light Source yield reconstructions of the smallest single biological objects imaged with an X-ray laser.
An all-optical modulation technique based on a pump–probe scheme for temporally, spectrally and spatially characterizing the flow of light in a variety of silicon photonic devices is demonstrated.
Tuning the bandgap of multiferroic solar cells made from Bi2FeCrO6 is achieved by cationic ordering and is shown to dramatically improve their performance.
Spatial hole burning typically decreases laser output but the effect can be manipulated by spatially tailored pump profiles to increase laser power-efficiency by orders of magnitude.
The authors report an experiment demonstrating fast control of the quantum dot–cavity coupling, indicating the coherent transfer of photons between the cavity and the quantum dot.
The authors demonstrate a technique for coherently transferring quantum information from the orbital to the spin degrees of freedom of electrons in a semiconductor, and back again.
The Gaussian minimum entropy conjecture—a long-standing open question—has now been proved for single-mode phase-insensitive bosonic Gaussian channels. This establishes the ultimate achievable bit rate under an energy constraint and provides long-awaited proof that the single-letter classical capacity of these channels is additive.
A three-photon entangled Greenberger–Horne–Zeilinger state is directly produced by cascading two entangled down-conversion processes. Experimentally, 11.1 triplets per minute are detected on average. The three-photon entangled state is used for state tomography and as a test of local realism by violating the Mermin and Svetlichny inequalities.