Quantum physics

Definition

Quantum physics is the study of matter and energy at its most fundamental level. A central tenet of quantum physics is that energy comes in indivisible packets called quanta. Quanta behave very differently to macroscopic matter: particles can behave like waves, and waves behave as though they are particles.

Featured

Latest Research and Reviews

  • Research | | open

    Scalable and integratable sources of entangled-photon pairs are an important building block for quantum photonic applications. Here, Huber et al. demonstrate that droplet-etched gallium arsenide quantum dots can emit highly indistinguishable photon pairs with a high degree of entanglement.

    • Daniel Huber
    • , Marcus Reindl
    • , Yongheng Huo
    • , Huiying Huang
    • , Johannes S. Wildmann
    • , Oliver G. Schmidt
    • , Armando Rastelli
    •  & Rinaldo Trotta
  • Research | | open

    Interfacing spin quantum memories with photons requires the controlled creation of defect centre—nanocavity systems. Here the authors demonstrate direct, maskless creation of single silicon vacancy centres in diamond nanostructures, and report linewidths comparable to naturally occurring centres

    • Tim Schröder
    • , Matthew E. Trusheim
    • , Michael Walsh
    • , Luozhou Li
    • , Jiabao Zheng
    • , Marco Schukraft
    • , Alp Sipahigil
    • , Ruffin E. Evans
    • , Denis D. Sukachev
    • , Christian T. Nguyen
    • , Jose L. Pacheco
    • , Ryan M. Camacho
    • , Edward S. Bielejec
    • , Mikhail D. Lukin
    •  & Dirk Englund
  • Research | | open

    Scalable and integratable sources of entangled-photon pairs are an important building block for quantum photonic applications. Here, Keil et al. demonstrate that an ensemble of droplet-etched gallium arsenide quantum dots can emit polarization-entangled photons with almost 100% yield.

    • Robert Keil
    • , Michael Zopf
    • , Yan Chen
    • , Bianca Höfer
    • , Jiaxiang Zhang
    • , Fei Ding
    •  & Oliver G. Schmidt
  • Research |

    An antiferromagnet with a correlation length that encompasses the whole system is created with the aid of quantum gas microscopy of cold atoms in an optical lattice.

    • Anton Mazurenko
    • , Christie S. Chiu
    • , Geoffrey Ji
    • , Maxwell F. Parsons
    • , Márton Kanász-Nagy
    • , Richard Schmidt
    • , Fabian Grusdt
    • , Eugene Demler
    • , Daniel Greif
    •  & Markus Greiner
    Nature 545, 462–466
  • Research | | open

    Device-independent self-testing is an approach that allows a complete certification of an unknown quantum state, simply by inspecting outcomes of measurements. Here, the authors demonstrate that any pure bipartite entangled state can be self-tested.

    • Andrea Coladangelo
    • , Koon Tong Goh
    •  & Valerio Scarani

News and Comment

  • News and Views |

    The Hubbard model describes the behaviour of interacting quantum particles, but many of its properties remain unknown. A system of ultracold atoms could provide the key to determining the model's underlying physics. See Letter p.462

    • Thierry Giamarchi
    Nature 545, 414–415
  • News and Views |

    Systems of quantum objects can be characterized by the correlations between the objects. A technique that precisely measures even the most delicate of these correlations allows models of quantum systems to be tested. See Letter p.323

    • Ian B. Spielman
    Nature 545, 293–294
  • News and Views |

    A technique for manipulating molecules uses an intermediary atom to query a nearby molecule's energy state and produces 'quantum superpositions' of these states, a prerequisite for extremely high-precision spectroscopy. See Letter p.203

    • Wes Campbell
    Nature 545, 164–165