Quantum metrology articles within Nature

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  • Article |

    The trapping of triply charged 229mTh3+ is described and its nuclear decay half-life determined, showing useful properties for the development of a nuclear clock and applications in the search for new physics.

    • Atsushi Yamaguchi
    • , Yudai Shigekawa
    •  & Hidetoshi Katori

  • Article
    | Open Access

    A room-temperature demonstration of optomechanical squeezing of light and measurement of mechanical motion approaching the Heisenberg limit using a phononic-engineered membrane-in-the-middle cavity with ultralow noise.

    • Guanhao Huang
    • , Alberto Beccari
    •  & Tobias J. Kippenberg

  • Article |

    In the dipolar XY model, quench dynamics from a polarized initial state lead to spin squeezing that improves with increasing system size, and two refinements show further enhanced squeezing and extended lifetime of the squeezed state by freezing its dynamics.

    • Guillaume Bornet
    • , Gabriel Emperauger
    •  & Antoine Browaeys

  • Article |

    Laser-based time transfer with near quantum-limited acquisition and timing is demonstrated that can support femtosecond precision over 102 dB link loss, more than sufficient for future time transfer to geosynchronous orbits for future optical clock networks.

    • Emily D. Caldwell
    • , Jean-Daniel Deschenes
    •  & Laura C. Sinclair

  • Article |

    Optomechanical lattices in one and two dimensions with exceptionally low disorder are realized, showing how the optomechanical interaction can be exploited for direct measurements of the Hamiltonian, beyond the tight-binding approximation.

    • Amir Youssefi
    • , Shingo Kono
    •  & Tobias J. Kippenberg

  • 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 |

    An elementary quantum network of two entangled atomic clocks is demonstrated; the high fidelity and speed of entanglement generation show that entangled clocks can offer practical enhancement for metrology.

    • B. C. Nichol
    • , R. Srinivas
    •  & D. M. Lucas

  • 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 |

    A new approach to generating quantum sensors with close-to-optimal performance is demonstrated experimentally through Ramsey interferometry with (up to) N = 26 entangled atoms on a trapped-ion quantum computer, without a priori knowledge of the device or its noise environment.

    • Christian D. Marciniak
    • , Thomas Feldker
    •  & Thomas Monz

  • Article |

    Multiple ultracold ensembles of strontium atoms are trapped in the same optical lattice, realizing a multiplexed optical clock where precision measurements can benefit from having all atoms share the same trapping light and clock laser.

    • Xin Zheng
    • , Jonathan Dolde
    •  & Shimon Kolkowitz

  • 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

  • Article |

    Operating in space, NASA’s Deep Space Atomic Clock, a trapped-ion clock, is shown to have long-term stability and drift that are an order of magnitude better than current space clocks.

    • E. A. Burt
    • , J. D. Prestage
    •  & T. A. Ely

  • Article |

    As a blueprint for high-precision quantum simulation, an 18-qubit algorithm that consists of more than 1,400 two-qubit gates is demonstrated, and reconstructs the energy eigenvalues of the simulated one-dimensional wire to a precision of 1 per cent.

    • C. Neill
    • , T. McCourt
    •  & V. Smelyanskiy

  • Article |

    A quantum enhanced search for dark matter that uses vacuum squeezing to overcome the quantum noise limit finds no evidence of dark matter axions in a well motivated mass range.

    • K. M. Backes
    • , D. A. Palken
    •  & H. Wang

  • Article |

    A many-atom state of trapped 171Yb atoms that are entangled on an optical atomic-clock transition overcomes the standard quantum limit, providing a proof-of-principle demonstration towards entanglement-based optical atomic clocks.

    • Edwin Pedrozo-Peñafiel
    • , Simone Colombo
    •  & Vladan Vuletić

  • Article |

    Viscous Dirac fluid flow in room-temperature graphene is imaged using quantum diamond magnetometry, revealing a parabolic Poiseuille profile for electron flow in a high-mobility graphene channel near the charge-neutrality point.

    • Mark J. H. Ku
    • , Tony X. Zhou
    •  & Ronald L. Walsworth

  • Article |

    The precision of laser spectroscopy of highly charged ions is improved by eight orders of magnitude by cooling trapped, highly charged ions and using quantum logic spectroscopy, thereby enabling tests of fundamental physics.

    • P. Micke
    • , T. Leopold
    •  & P. O. Schmidt

  • Letter |

    Number-state superpositions of the harmonic motion of a trapped beryllium ion are used to measure the oscillation frequency with quantum-enhanced sensitivity, achieving a mode-frequency uncertainty of about 10−6.

    • Katherine C. McCormick
    • , Jonas Keller
    •  & Dietrich Leibfried

  • 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 |

    Agreement between two single-ion clocks is demonstrated experimentally at the 10−18 level over a six-month period, confirming a key postulate of Einstein’s theory of relativity with hundredfold-improved precision.

    • Christian Sanner
    • , Nils Huntemann
    •  & Sergey G. Porsev

  • Letter |

    Clock spectroscopy of ultracold strontium atoms in a three-dimensional optical lattice is used to observe the onset of multi-body interactions that result from the underlying pairwise interactions between atoms.

    • A. Goban
    • , R. B. Hutson
    •  & J. Ye

  • Letter |

    Simultaneous measurement of two incompatible observables in a superconducting qubit placed in a cavity shows that the quantum dynamics of the system is governed by the uncertainty principle and that the wavefunction collapse is replaced by persistent diffusion.

    • Shay Hacohen-Gourgy
    • , Leigh S. Martin
    •  & Irfan Siddiqi

  • Letter |

    A highly sensitive electrometer is reported that is based on a Schrödinger-cat state in a Rydberg atom, that reaches a sensitivity beyond the standard quantum limit and can compete with state-of-the-art electric field measurements performed using electromechanical resonators and single-electron transistors.

    • Adrien Facon
    • , Eva-Katharina Dietsche
    •  & Sébastien Gleyzes

  • Letter |

    Detecting the quantum states of molecules is harder than detecting those of atoms; here, a way around this problem is found by co-trapping a molecular and an atomic ion, using the state of the atomic ion to non-destructively determine that of the molecular ion.

    • Fabian Wolf
    • , Yong Wan
    •  & Piet O. Schmidt

  • Letter |

    Quantum entanglement is thought to offer great promise for improving measurement precision; now a spin-squeezing implementation with cold atoms offers levels of sensitivity unavailable with any competing conventional method, sensing microwave induced rotations a factor of 70 beyond the standard quantum limit.

    • Onur Hosten
    • , Nils J. Engelsen
    •  & Mark A. Kasevich

  • Letter |

    Harnessing the entanglement of different ionic species could bring new flexibility in quantum computing, and now two groups independently demonstrate entanglement between different atomic species; Tan et al. achieve entanglement between different elements, whereas the related paper by Ballance et al. shows entanglement between different atomic isotopes, together demonstrating a first step towards mixed-species quantum logic.

    • T. R. Tan
    • , J. P. Gaebler
    •  & D. J. Wineland

  • Letter |

    A position sensor is demonstrated that is capable of resolving the zero-point motion of a nanomechanical oscillator in the timescale of its thermal decoherence; it achieves an imprecision that is four orders of magnitude below that at the standard quantum limit and is used to feedback-cool the oscillator to a mean photon number of five.

    • D. J. Wilson
    • , V. Sudhir
    •  & T. J. Kippenberg

  • Letter |

    A quantum error correction scheme is demonstrated in a system of superconducting qubits, and repeated quantum non-demolition measurements are used to track errors and reduce the failure rate; increasing the system size from five to nine qubits improves the failure rate further.

    • J. Kelly
    • , R. Barends
    •  & John M. Martinis

  • Letter |

    An electronic analogue of a Michelson–Morley experiment, in which an electron wave packet bound inside a calcium ion is split into two parts and subsequently recombined, demonstrates that the relative change in orientation of the two parts that results from the Earth’s rotation reveals no anisotropy in the electron dispersion; this verification of Lorentz symmetry improves on the precision of previous tests by a factor of 100.

    • T. Pruttivarasin
    • , M. Ramm
    •  & H. Häffner

  • Letter |

    Reconstruction of the quantum trajectories of a superconducting circuit that evolves under the competing influences of continuous weak measurement and Rabi drive makes it possible to deduce the most probable path through quantum state space.

    • S. J. Weber
    • , A. Chantasri
    •  & I. Siddiqi

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