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Strong coupling between X-rays and matter excitations in arrays of alternating 57Fe and 56Fe layers is demonstrated. The results may open the door to X-ray quantum optics and strong coupling phenomena.
A silicon nitride ring resonator with implanted ytterbium ions offers a means for greatly enhanced ion–light interactions in an integrated optics platform.
By using a single-photon frequency converter based on quasi-phase-matched LiNbO3, frequency-domain Hong–Ou–Mandel interference is demonstrated between a heralded single photon at 780 nm and a weak laser pulse at 1,522 nm in a single spatial mode.
Photons are efficiently funnelled into a single molecule if they are nearly resonant with the sharp molecular transition. In this condition, the coherent nonlinear optical effect can be induced with only a few photons without high-finesse cavities.
An efficient light–matter interface for quantum repeaters is developed. By placing Rb atoms optically confined in a 3D lattice in a ring cavity, an initial retrieval efficiency of 76% together with a 1/e lifetime of 0.22 s are achieved.
Quantum cryptography immune from detector attacks is realized by the development of a source of indistinguishable laser pulses based on optically seeded gain-switched lasers. Key rates exceeding 1 Mb s−1 are demonstrated in the finite-size regime.
Researchers demonstrate graphene plasmon edge modes at infrared wavelengths. Such modes may offer additional electromagnetic field confinement compared with conventional sheet modes.
Design and fabrication techniques that allow analogous dispersion control in chip-integrated optical microresonators are presented, allowing higher-order, wide-bandwidth dispersion control over an octave of spectrum.
Unconventional interference and statistics of photon fields are studied using two-state 87Rb atoms interacting with photons in an optical cavity. The observations are well described by the Tavis-Cummings model in the strong-coupling regime.
The most accurate ratio of the clock transition frequencies between Yb and Sr is measured by using a pair of cryogenic optical lattice clocks. Through common mode rejection of the clock laser noise, a uncertainty of 4.6 × 10−17 is achieved in 150 seconds.
A three-photon entangled state with 3 × 3 × 2 dimensions of its orbital angular momentum is created by using two independent entangled photon pairs from two nonlinear crystals, enabling the development of a new layered quantum communication protocol.
Researchers demonstrate correlation of two colours (63.0 and 31.5 nm wavelengths) in a free-electron laser and control photoelectron angular distribution by adjusting phase with 3 attosecond resolution.
A photonic analogue of charge pumping in electronic quantum Hall systems is demonstrated by using a finite 2D square annulus of ring resonators. Topological invariants are investigated by observing the shift of the edge state resonances.