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Volume 17 Issue 5, May 2021

Volume 17 Issue 5

Incoherent quantum holography

By exploiting polarization entanglement between photons, quantum holography can circumvent the need for the first-order coherence required for classical holographic imaging. In this protocol, when one photon in an entangled pair is directed at a smiley-shaped object, the phase information of the object is instantaneously shared with the other photon, regardless of their separation. The object shape is then remotely reconstructed in the form of quantum holograms by detecting photons with separate cameras.

See Defienne et al.

Image: Hugo Defienne, University of Glasgow. Cover Design: Allen Beattie.


  • Editorial |

    The recent measurement of the muon’s anomalous magnetic moment increases the tension with predictions from theory. Or does it?


  • Comment |

    Passing a supercurrent through a topological material can highlight the existence of higher-order boundary states, and may lead to applications in topological superconductivity.

    • Yaojia Wang
    • Gil-Ho Lee
    • Mazhar N. Ali


Books & Arts

News & Views

  • News & Views |

    The virtual photons that are exchanged when a free-electron vortex beam interacts with a nanoscopic target unlock an explicit connection between polarized optical spectroscopy and the inelastic scattering of scalar electron waves.

    • David J. Masiello
  • News & Views |

    A quantum dot has been used to detect a single excitation among the tens of thousands of atomic nuclear spins comprising it. This result is an important step towards treating nuclear spins as a quantum memory rather than a troublesome source of noise.

    • Paul Hilaire
    • Sophia E. Economou
  • News & Views |

    The short lifetime of light-induced superconductivity prevents the measurement of its transport properties. Encouraging this state to stay a little longer in K3C60 allows the observation of vanishing electrical resistance.

    • Anshul Kogar
  • News & Views |

    Recent advances in spectroscopy give access to the decay time of excitations in disordered insulating silicon close to the metal–insulator transition, revealing similarities to high-temperature cuprate superconductors.

    • Eduardo Miranda
  • News & Views |

    SARS, MERS and now SARS-CoV-2 are unlikely to be the last emerging infections we face during our lifetimes. Tracing contacts both forward and backward through our heterogeneous populations will prove essential to future response strategies.

    • Johannes Müller
    • Mirjam Kretzschmar



  • Article |

    By exploiting polarization entanglement between photons, quantum holography can circumvent the need for first-order coherence that is vital to classical holography.

    • Hugo Defienne
    • Bienvenu Ndagano
    • Daniele Faccio
  • Article |

    The functionality of electron energy loss spectroscopy can be extended to include a polarization analogue constructed via the dipole transition vector between two electronic states, bringing it closer to its optical counterpart.

    • Hugo Lourenço-Martins
    • Davy Gérard
    • Mathieu Kociak
  • Article |

    A pair of strongly coupled photonic microresonators shows nonlinear emergent behaviour, which can be understood by incorporating interactions in the theoretical description of nonlinear optical systems.

    • A. Tikan
    • J. Riemensberger
    • T. J. Kippenberg
  • Article | | Open Access

    Evidence for light-induced superconductivity in K3C60 was limited to optical methods due to the short lifetime of the phase. Extending the lifetime from picoseconds to nanoseconds now allows measurement of its negligible electrical resistance.

    • M. Budden
    • T. Gebert
    • A. Cavalleri
  • Article |

    The combination of disorder and strong interactions makes it hard to understand the nature of doped silicon’s insulating phase. State-of-the-art spectroscopy measurements show marginal electronic behaviour reminiscent of what is seen in the cuprates.

    • Fahad Mahmood
    • Dipanjan Chaudhuri
    • N. P. Armitage
  • Article |

    Topological materials are characterized by the topological invariants of filled bands, which cannot be used for bosonic systems. Instead, their topological invariants can be found via the transition from bound to leaky modes in photonic lattices.

    • Daniel Leykam
    • Daria A. Smirnova
  • Article |

    The ability to perform multiple tasks simultaneously is a key characteristic of parallel architectures. Using methods from statistical physics, this study provides analytical results that quantify the limitations of processing capacity for different types of tasks in neural networks.

    • Giovanni Petri
    • Sebastian Musslick
    • Jonathan D. Cohen
  • Article |

    Contact tracing is key to epidemic control, but network analysis now suggests that whom you infect may not be as pertinent a question as who infected you. Biases due to contact heterogeneity reveal the efficacy of backward over forward tracing.

    • Sadamori Kojaku
    • Laurent Hébert-Dufresne
    • Yong-Yeol Ahn

Amendments & Corrections

Measure for Measure

  • Measure for Measure |

    As the namesake of a variety of constants, distributions and equations, Ludwig Boltzmann has earned his place in the physics hall of fame. But as Ankita Anirban reveals, he cannot take sole credit for the most famous constant bearing his name.

    • Ankita Anirban


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