Matter waves and particle beams articles within Nature

Featured

  • Article |

    A spatially distributed, atomic clock network entangled via quantum nondemolition measurements offers better precision and lower noise compared to an equivalent mode-separable network, and the improvements scale with network size.

    • Benjamin K. Malia
    • , Yunfan Wu
    •  & Mark A. Kasevich

  • Article
    | Open Access

    A matter-wave interferometer is demonstrated with an interferometric phase noise below the standard quantum limit, combining two core concepts of quantum mechanics, that a particle can simultaneously be in two places at once and entanglement between distinct particles.

    • Graham P. Greve
    • , Chengyi Luo
    •  & James K. Thompson

  • Article |

    A mechanism for self-oscillating pumping in a quantum gas is demonstrated using a Bose–Einstein condensate coupled to a dissipative cavity, where a particle current is observed without external periodic driving.

    • Davide Dreon
    • , Alexander Baumgärtner
    •  & Tobias Donner

  • Article
    | Open Access

    Continuous, indefinitely lasting Bose–Einstein condensation, sustained by amplification through Bose-stimulated gain of atoms from a thermal bath, creates a continuous-wave condensate of strontium atoms.

    • Chun-Chia Chen
    • , Rodrigo González Escudero
    •  & Florian Schreck

  • Article |

    Bubbles of ultracold atoms have been created, observed and characterized at the NASA Cold Atom Lab onboard the International Space Station, made possible by the microgravity environment of the laboratory.

    • R. A. Carollo
    • , D. C. Aveline
    •  & N. Lundblad

  • Article
    | Open Access

    A study reports a quantum gravity gradient sensor with a design that eliminates the need for long measurement times, and demonstrates the detection of an underground tunnel in an urban environment.

    • Ben Stray
    • , Andrew Lamb
    •  & Michael Holynski

  • Article
    | Open Access

    A silicon nitride microresonator is used for coherent phase modulation of a transmission electron microscope beam, with future applications in combining high-resolution microscopy with spectroscopy, holography and metrology.

    • Jan-Wilke Henke
    • , Arslan Sajid Raja
    •  & Tobias J. Kippenberg

  • Letter |

    Bose–Einstein condensates are transported at hypersonic speeds over a distance of 15 cm in a neutral-atom accelerator ring while preserving their internal coherence.

    • Saurabh Pandey
    • , Hector Mas
    •  & Wolf von Klitzing

  • Letter |

    Ghost imaging is demonstrated using beams of correlated pairs of ultracold helium atoms, rather than photons, yielding a reconstructed image with submillimetre resolution.

    • R. I. Khakimov
    • , B. M. Henson
    •  & A. G. Truscott

  • Brief Communications Arising |

    • T. Kovachy
    • , P. Asenbaum
    •  & M. A. Kasevich

  • Letter |

    A quasiparticle collider is developed that uses femtosecond optical pulses to create electron–hole pairs in the layered dichalcogenide tungsten diselenide, and a strong terahertz field to accelerate and collide the electrons with the holes.

    • F. Langer
    • , M. Hohenleutner
    •  & R. Huber

  • Letter |

    Matter-wave interferometers provide an opportunity to measure whether quantum superpositions exist at macroscopic length scales or only at microscopically small scales; now such instruments have demonstrated quantum interference of wave packets separated by 54 cm.

    • T. Kovachy
    • , P. Asenbaum
    •  & M. A. Kasevich

  • Letter |

    In non-Hermitian systems, spectral degeneracies can arise that can cause unusual, counter-intuitive effects; here exciton-polaritons—hybrid light–matter particles—within a semiconductor microcavity are found to display non-trivial topological modal structure exclusive to such systems.

    • T. Gao
    • , E. Estrecho
    •  & E. A. Ostrovskaya

  • Letter |

    Interferometry reveals quantized changes in the angular momentum of neutrons that have been ‘twisted’ by passage through a spiral staircase structure.

    • Charles W. Clark
    • , Roman Barankov
    •  & Dmitry A. Pushin

  • Letter |

    The coherent manipulation of electron quantum states using light, commonly employed in atoms and molecules, is extended to the case of free electron beams using ultrafast transmission electron microscopy; this approach may enable a range of applications in ultrafast electron imaging and spectroscopy down to attosecond precision.

    • Armin Feist
    • , Katharina E. Echternkamp
    •  & Claus Ropers

  • Letter |

    The Hong–Ou–Mandel effect—in which two indistinguishable photons that enter a 50:50 beam-splitter are found only as a pair at one of the two outputs, leading to a dip in the coincidence rate of the detectors—is now realized with 4He atoms instead of photons; this opens the way to performing basic quantum-physics experiments with mechanical observables of massive particles.

    • R. Lopes
    • , A. Imanaliev
    •  & C. I. Westbrook

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