Matter waves and particle beams articles within Nature Physics

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  • News & Views |

    Generating high harmonics or attosecond pulses of light is normally thought of as a classical process, but a theoretical study has now shown how the process could be driven by quantum light.

    • Dong Hyuk Ko
    •  & P. B. Corkum

  • News & Views |

    Two studies of electrons generated from laser-triggered emitters have found highly predictable electron–electron energy correlations. These studies, at vastly different energy scales, may lead to heralded electron sources, enabling quantum free-electron optics and low-noise, low-damage electron beam lithography and microscopy.

    • John W. Simonaitis
    •  & Phillip D. Keathley

  • Article
    | Open Access

    Coulomb interactions in free-electron beams are usually seen as an adverse effect. The creation of distinctive number states with one, two, three and four electrons now reveals unexpected opportunities for electron microscopy and lithography from Coulomb correlations.

    • Rudolf Haindl
    • , Armin Feist
    •  & Claus Ropers

  • Research Briefing |

    It’s a long-standing theoretical prediction that mutual information in locally interacting, many-body quantum systems follows an area law. Using cold-atom quantum-field simulators on an atom chip to measure the scaling of von Neumann entropy and mutual information, that prediction is now proved true.

  • News & Views |

    Reconstructing the motional quantum states of massive particles has important implications for quantum information science. Motional tomography of a single atom in an optical tweezer has now been demonstrated.

    • Hannes Bernien

  • Article |

    A tomography protocol that exploits the control offered by optical tweezers allows the reconstruction of motional states of a single trapped atom. This has implications for the study of non-classical states of massive trapped and levitated particles.

    • M. O. Brown
    • , S. R. Muleady
    •  & C. A. Regal

  • Review Article |

    Laser cooling underpins the field of ultracold quantum gases. This Review surveys recent methodological advances that are pushing quantum gases into new regimes.

    • Florian Schreck
    •  & Klaasjan van Druten

  • Letter |

    Two-dimensional density patterns with two-, four- and six-fold symmetries emerge in homogeneous Bose–Einstein condensates when the atomic interactions are modulated at multiple frequencies causing the coherent mixing of excitations.

    • Zhendong Zhang
    • , Kai-Xuan Yao
    •  & Cheng Chin

  • Letter |

    Matter-wave interference experiments demonstrate quantum superposition of molecules consisting of up to 2,000 atoms—the heaviest objects to show this quantum behaviour to date. This provides a bound on potential modifications to quantum mechanics.

    • Yaakov Y. Fein
    • , Philipp Geyer
    •  & Markus Arndt

  • Article |

    The physical conditions that support a geometric interpretation of spacetime, such as the equivalence between rest and inertial mass, are shown not to be necessarily valid in the quantum regime, and a quantum formulation is provided.

    • Magdalena Zych
    •  & Časlav Brukner

  • Letter |

    Unsupervised machine learning techniques can efficiently perform quantum state tomography of large, highly entangled states with high accuracy, and allow the reconstruction of many-body quantities from simple experimentally accessible measurements.

    • Giacomo Torlai
    • , Guglielmo Mazzola
    •  & Giuseppe Carleo

  • Letter
    | Open Access

    The effect of blackbody radiation is expected to be very weak. The acceleration due to the attractive optical forces from blackbody radiation is measured in an atom interferometer and, surprisingly, it dominates gravity and radiation pressure

    • Philipp Haslinger
    • , Matt Jaffe
    •  & Holger Müller

  • Letter |

    Using a technique inspired by Ramsey spectroscopy it is now possible to coherently control free electrons in an electron microscope.

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

  • Letter |

    A simulation method connects single-shot measurements in ultracold atom experiments to the probability distribution of the many-body wavefunction, elucidating the role of the fluctuations in different experimental situations.

    • Kaspar Sakmann
    •  & Mark Kasevich

  • Progress Article |

    Similar to orbital angular momentum-carrying optical beams, it is now possible to engineer structured electron beams that could find applications in imaging, nanofabrication and the study of fundamental phenomena.

    • Jérémie Harris
    • , Vincenzo Grillo
    •  & Ebrahim Karimi

  • Article |

    The mobility edge characterizes the transition from localization to diffusion. This key parameter in Anderson localization was measured for a system of ultracold atoms in a tunable disordered potential created by laser speckles.

    • G. Semeghini
    • , M. Landini
    •  & G. Modugno

  • News & Views |

    Solitons in attractive Bose–Einstein condensates are mesoscopic quantum objects that may prove useful as tools for precision measurement. A new experiment shows that collisions of matter-wave bright solitons depend crucially on their relative phase.

    • Thomas P. Billam
    •  & Christoph Weiss

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