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Carrier-envelope-phase control of the electronic current over a laterally confined tunnelling gap a few nanometres wide yields current densities above 50 MA cm–2 driven by picojoule-level optical pulses at room temperature.
The first field test of quantum teleportation is implemented across a metropolitan fibre network with independent quantum light sources. To establish a robust quantum teleportation system in the real world, several feedback mechanisms are developed.
Non-magnetic non-reciprocal transparency and amplification is experimentally achieved by optomechanics using a whispering-gallery microresonator. The idea may lead to integrated all-optical isolators or non-reciprocal phase shifters.
Real-time geopotential measurements with two synchronously linked optical lattice clocks are demonstrated. A height difference between the two clocks separated by 15 km is determined, with an uncertainty of 5 cm, by means of a gravitational redshift.
The violation of the no-signalling principle — information can be transmitted faster than light — is experimentally investigated using entangled photons. It can be simulated when the parity–time symmetrically evolved subspace is solely considered.
Cheap and sensitive gamma-ray detectors are desired for defence, medical and research applications. Solid-state gamma-radiation detectors made from solution-grown perovskites have now been demonstrated for multiple practical applications.
The local amplitude and phase of a single photon is retrieved using a method similar to classical holography. The interference of optical fields is replaced by the non-classical interference of spatially varying two-photon probability amplitudes.
Echo-enabled harmonic generation has been used to seed a free-electron laser and has been demonstrated up to the 75th harmonic, producing 32 nm light from a 2,400 nm laser.
Coherent transfer of an optical photon polarization state to a single nuclear spin in a nitrogen–vacancy defect centre in diamond is demonstrated without a high-finesse cavity. A storage time of 10 s is achieved with a transfer fidelity of 98%.
Direct f–2f self-referencing of a microresonator-based optical frequency comb is demonstrated at a repetition rate of 16.4 GHz. The carrier envelope offset frequency and repetition rate are stabilized to a hydrogen maser-based atomic clock.