Quantum metrology

Quantum metrology uses quanta — individual packets of energy — for setting the standards that define units of measurement and for other high-precision research. Quantum mechanics sets the ultimate limit on the accuracy of any measurement. Quantum metrology, therefore, uses quantum effects to enhance precision beyond that possible through classical approaches.

Latest Research and Reviews

News and Comment

  • Comments & Opinion |

    The shift of the definition of the kilogram in 2019 away from an artefact to one relying on the Planck constant inspires technological innovation, as Naoki Kuramoto elucidates.

    • Naoki Kuramoto
    Nature Physics 18, 720
  • News & Views |

    Entanglement can provide an extra boost in precision, but entangled states are hard to detect. A recent experiment solves this problem by letting the entangling dynamics come full circle — or not, depending on the subtle perturbation to be sensed.

    • Philipp Kunkel
    •  & Monika Schleier-Smith
    Nature Physics 18, 124-125
  • News & Views |

    Squeezed light is useful for metrology and quantum information. An optomechanical squeezed light source that works at room temperature will facilitate the technological applications of quantum light.

    • André Xuereb
    Nature Physics 16, 710-711