Quantum physics articles within Nature

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  • Article
    | Open Access

    By using a pump–probe atomic force microscopy detection scheme, electron spin transitions between non-equilibrium triplet states of individual pentacene molecules, as well as the ability to manipulate electron spins over tens of microseconds, is demonstrated.

    • Lisanne Sellies
    • , Raffael Spachtholz
    •  & Jascha Repp

  • Article
    | Open Access

    Silicon photonic nanocavities based on surface forces and conventional lithography and etching are developed, demonstrating pioneering technology that integrates atomic dimensions with the scalability of planar semiconductors.

    • Ali Nawaz Babar
    • , Thor August Schimmell Weis
    •  & Søren Stobbe

  • Article |

    On a 51-ion quantum simulator, we investigate locality of entanglement Hamiltonians for a Heisenberg chain, demonstrating Bisognano–Wichmann predictions of quantum field theory applied to lattice many-body systems, and observe the transition from area- to volume-law scaling of entanglement entropies.

    • Manoj K. Joshi
    • , Christian Kokail
    •  & Peter Zoller

  • Article |

    A one-dimensional trapped-ion quantum simulator with up to 23 spins is used to demonstrate a continuous symmetry-breaking phase that relies on long-range interactions.

    • Lei Feng
    • , Or Katz
    •  & Christopher Monroe

  • Article |

    Using upgraded hardware of the multiuser Cold Atom Lab (CAL) aboard the International Space Station (ISS), Bose–Einstein condensates (BECs) of two atomic isotopes are simultaneously created and used to demonstrate interspecies interactions and dual species atom interferometry in space.

    • Ethan R. Elliott
    • , David C. Aveline
    •  & Jason R. Williams

  • News & Views |

    Lasers, and a cold ensemble of magnetic atoms, have been used to mimic a complex quantum system characterized by long-range interactions — an essential ingredient for realizing realistic models of many quantum materials.

    • P. Blair Blakie
    •  & Barbara Capogrosso-Sansone

  • Research Briefing |

    Superconducting detectors are a leading technology for the detection of single photons, but have been limited in the number of pixels that they can offer. A 400,000-pixel superconducting nanowire single-photon detector camera provides an improvement by a factor of 400 compared with the current state of the art.

  • Article |

    The realization of dipolar quantum solids with an ultracold gas of magnetic atoms in an optical lattice ushers in quantum simulation of many-body systems with long-range anisotropic interactions.

    • Lin Su
    • , Alexander Douglas
    •  & Markus Greiner

  • News & Views |

    An electrically insulating quantum material turns metallic when placed between two semi-reflecting mirrors — even if there is no illumination between them. This discovery paves the way for engineering other phase transitions.

    • Edoardo Baldini

  • Article
    | Open Access

    The realization of two-qubit entangling gates with 99.5% fidelity on up to 60 rubidium atoms in parallel is reported, surpassing the surface-code threshold for error correction and laying the groundwork for neutral-atom quantum computers.

    • Simon J. Evered
    • , Dolev Bluvstein
    •  & Mikhail D. Lukin

  • Research Briefing |

    Quantum electrodynamics, the archetypical theory of electromagnetic interactions, describes the behaviour of charged particles and photons using quantum field theory. Measuring the g factor of a bound electron in a hydrogen-like tin ion (118Sn49+) provides one of the most stringent tests so far of quantum electrodynamics in strong electric fields.

  • Article
    | Open Access

    Many different homogeneous metrics on Lie groups, which may have markedly different short-distance properties, are shown to exhibit nearly identical distance functions at long distances, suggesting a large universality class of definitions of quantum complexity.

    • Adam R. Brown
    • , Michael H. Freedman
    •  & Leonard Susskind

  • Article
    | Open Access

    This study reports the creation of a model thermodynamic engine that is fuelled by the energy difference resulting from changing the statistics of a quantum gas from bosonic to fermionic.

    • Jennifer Koch
    • , Keerthy Menon
    •  & Artur Widera

  • Article
    | Open Access

    Resonant X-ray excitation of the  45Sc nuclear isomeric state was achieved by irradiation of a Sc-metal foil with 12.4-keV photon pulses from a state-of-the-art X-ray free-electron laser, allowing a high-precision determination of the transition energy.

    • Yuri Shvyd’ko
    • , Ralf Röhlsberger
    •  & Tomasz Kolodziej

  • Research Briefing |

    Loss of photons over long-distance connections limits the development of quantum networks, necessitating the use of quantum ‘repeater’ systems to boost signals between network nodes. Erbium ions incorporated into calcium tungstate crystals have been found to emit photons in the telecommunications frequency band that are indistinguishable from each other, and thus show promise for use in such repeaters.

  • 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 |

    Er3+ is implanted into CaWO4, a material with non-polar site symmetry free of background rare earth ions, to realize reduced optical spectral diffusion in nanophotonic devices, representing a step towards making telecom band quantum repeater networks with single ions.

    • Salim Ourari
    • , Łukasz Dusanowski
    •  & Jeff D. Thompson

  • Essay |

    Computational rules might describe the evolution of the cosmos better than the dynamical equations of physics — but only if they are given a quantum twist.

    • David L. Chandler

  • Article
    | Open Access

    We report organic molecules showing both efficient luminescence and near-unity generation yield of excited states with high spin multiplicity, simultaneously supporting a high efficiency of initialization, spin manipulations and light-based readout at room temperature.

    • Sebastian Gorgon
    • , Kuo Lv
    •  & Emrys W. Evans

  • Research Briefing |

    The ordering of magnetic moments in a strongly correlated system depends on the lattice they inhabit, with triangular lattices yielding exotic phases through an effect called geometrical frustration. Experiments demonstrate that ultracold atoms in such lattices show frustration and, surprisingly, display an ordering called ferromagnetism when mobile charges are present.

  • Article |

    The magnetic phases of the geometrically frustrated triangular lattice Hubbard model are directly investigated using ultracold fermionic atoms, indicating a possible transition to ferromagnetism at a filling of 1.2.

    • Muqing Xu
    • , Lev Haldar Kendrick
    •  & Markus Greiner

  • Article |

    Equilibrium-like state variables, related by an equation of state, are identified in a study of turbulent cascade of matter waves in a far-from-equilibrium ultracold atomic Bose gas.

    • Lena H. Dogra
    • , Gevorg Martirosyan
    •  & Zoran Hadzibabic

  • News & Views |

    Using a quantum computer to speed up one step in a textbook approach to generating random numbers proves to be a savvy strategy, and one that could make good use of quantum computers that will be available in the near future.

    • Mohan Sarovar

  • Article |

    Spectroscopic measurements of individual rare-earth ion electron spins are performed by detecting their microwave fluorescence, with the method coming close to practical single-electron spin resonance at millikelvin temperatures.

    • Z. Wang
    • , L. Balembois
    •  & E. Flurin

  • Article |

    A quantum algorithm is introduced that performs Markov chain Monte Carlo to sample from the Boltzmann distribution of Ising models, demonstrating, through experiments and simulations, a polynomial speedup compared with classical alternatives.

    • David Layden
    • , Guglielmo Mazzola
    •  & Sarah Sheldon

  • News & Views |

    Time signals have been transmitted across 300 kilometres with an accuracy and precision limited only by the quantum nature of photons. The feat promises to revolutionize high-precision science using satellites.

    • David Gozzard

  • 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

  • News & Views |

    A post-processing technique for handling errors has enabled a quantum computer comprising 127 quantum bits to calculate the physical properties of a complex model system — a task that cannot be performed by a classical computer.

    • Göran Wendin
    •  & Jonas Bylander

  • Article
    | Open Access

    Experiments on a noisy 127-qubit superconducting quantum processor report the accurate measurement of expectation values beyond the reach of current brute-force classical computation, demonstrating evidence for the utility of quantum computing before fault tolerance.

    • Youngseok Kim
    • , Andrew Eddins
    •  & Abhinav Kandala

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