Quantum mechanics articles within Nature

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  • 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
    | Open Access

    A unitary protocol for braiding projective non-Abelian Ising anyons in a generalized stabilizer code is implemented on a superconducting processor, allowing for verification of their fusion rules and realization of their exchange statistics.

    • T. I. Andersen
    • , Y. D. Lensky
    •  & P. Roushan

  • Article
    | Open Access

    A loophole-free violation of Bell’s inequality with superconducting circuits shows that non-locality is a viable new resource in quantum information technology realized with superconducting circuits, promising many potential applications.

    • Simon Storz
    • , Josua Schär
    •  & Andreas Wallraff

  • Article |

    Two-colour modulation spectroscopy of laser field-driven electrons uncovers the suboptical-cycle strong-field emission dynamics from nanostructures with attosecond precision by measuring photoelectron spectra of electrons as function of the relative phase between the two colours.

    • Philip Dienstbier
    • , Lennart Seiffert
    •  & Peter Hommelhoff

  • Article
    | Open Access

    An electrically driven motor on the molecular scale based on [3]catenane is described, in which two cyclobis(paraquat-p-phenylene) rings operate by means of redox reactions, demonstrating highly unidirectional movement around a circular loop.

    • Long Zhang
    • , Yunyan Qiu
    •  & J. Fraser Stoddart

  • Article |

    This study demonstrates the experimental realization of a complete protocol for quantum key distribution using entangled trapped strontium ions with device-independent quantum security guarantees.

    • D. P. Nadlinger
    • , P. Drmota
    •  & J.-D. Bancal

  • Article |

    Using continuous microwave application without substantial heating, Floquet–Andreev states in graphene Josephson junctions are realized, and their energy spectra are measured directly by superconducting tunnelling spectroscopy.

    • Sein Park
    • , Wonjun Lee
    •  & Gil-Ho Lee

  • Article |

    At the Large Hadron Collider, the MoEDAL experiment shows no evidence for magnetic monopoles generated via the Schwinger mechanism at integer Dirac charges below 3, and suggests a lower mass limit of 75 GeV/c2.

    • B. Acharya
    • , J. Alexandre
    •  & O. Vives

  • Article |

    Magnetically tunable interactions between lithium atoms and barium ions are used to demonstrate and probe Feshbach resonances between atoms and ions, which could have applications in the fields of experimental quantum simulation and fundamental physics.

    • Pascal Weckesser
    • , Fabian Thielemann
    •  & Tobias Schaetz

  • Article |

    Gold nanoflake pairs form by self-assembly in an aqueous ligand solution and offer stable and tunable microcavities by virtue of equilibrium between attractive Casimir forces and repulsive electrostatic forces.

    • Battulga Munkhbat
    • , Adriana Canales
    •  & Timur O. Shegai

  • Article |

    A Bose-Einstein condensate of molecules is produced by pairing atoms in an atomic condensate; this transition is the bosonic analog of the Bardeen-Cooper-Schrieffer superfluid to BEC crossover in Fermi gases.

    • Zhendong Zhang
    • , Liangchao Chen
    •  & Cheng Chin

  • Article |

    A deterministic correction of errors caused by qubit loss or leakage outside the computational space is demonstrated in a trapped-ion experiment by using a minimal instance of the topological surface code.

    • Roman Stricker
    • , Davide Vodola
    •  & Rainer Blatt

  • Article |

    The semiclassical quantization rule breaks down for a class of dispersionless flat bands, and their anomalous Landau level spectrum is characterized by their Hilbert–Schmidt quantum distance.

    • Jun-Won Rhim
    • , Kyoo Kim
    •  & Bohm-Jung Yang

  • Letter |

    A hybrid platform comprising a microwave superconducting qubit and a nanomechanical piezoelectric oscillator is used to resolve the phonon number states of the oscillator.

    • Patricio Arrangoiz-Arriola
    • , E. Alex Wollack
    •  & Amir H. Safavi-Naeini

  • Letter |

    A parametrically driven 30-micrometre-long silicon nanostring oscillator emits stationary path-entangled microwave radiation, squeezing the joint field operators of two thermal modes by 3.4 decibels below the vacuum level.

    • S. Barzanjeh
    • , E. S. Redchenko
    •  & J. M. Fink

  • Letter |

    Experiment overturns Bohr’s view of quantum jumps, demonstrating that they possess a degree of predictability and when completed are continuous, coherent and even deterministic.

    • Z. K. Minev
    • , S. O. Mundhada
    •  & M. H. Devoret

  • Letter |

    A non-classical superposition of zero- and one-phonon mechanical Fock states is generated and measured by strongly coupling a surface acoustic-wave resonator to a superconducting qubit.

    • K. J. Satzinger
    • , Y. P. Zhong
    •  & A. N. Cleland

  • Letter |

    A fundamental electronic noise—beyond electronic thermal noise and voltage-activated shot noise—that is generated by temperature differences across nanoscale conductors is demonstrated, with possible implications for thermometry and electronics.

    • Ofir Shein Lumbroso
    • , Lena Simine
    •  & Oren Tal

  • Letter |

    A teleported controlled-NOT gate is realized experimentally between two logical qubits implemented as superconducting cavity quantum memories, thus demonstrating an important tool for universal computation in a quantum modular architecture.

    • Kevin S. Chou
    • , Jacob Z. Blumoff
    •  & R. J. Schoelkopf

  • Letter |

    The BIG Bell Test, which used an online video game with 100,000 participants worldwide to provide random bits to 13 quantum physics experiments, contradicts the Einstein–Podolsky–Rosen worldview of local realism.

    • C. Abellán
    • , A. Acín
    •  & J. Zhong

  • Letter |

    A strong lightwave in a monolayer of tungsten diselenide drives changes in the valley pseudospin, making valley pseudospin an information carrier that is switchable faster than a single light cycle.

    • F. Langer
    • , C. P. Schmid
    •  & R. Huber

  • Letter |

    Many-body two- and three-string states are realized experimentally in the antiferromagnetic Heisenberg–Ising chain SrCo2V2O8 in strong longitudinal magnetic fields.

    • Zhe Wang
    • , Jianda Wu
    •  & Alois Loidl

  • Review Article |

    Quantum technology enables new methods for generating of randomness with minimal assumptions, certified by the violation of a Bell inequality, which opens up new theoretical and experimental research directions and leads to new challenges.

    • Antonio Acín
    •  & Lluis Masanes

  • Letter |

    Ghost imaging is demonstrated using beams of correlated pairs of ultracold helium atoms, rather than photons, yielding a reconstructed image with submillimetre resolution.

    • R. I. Khakimov
    • , B. M. Henson
    •  & A. G. Truscott

  • 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

  • Brief Communications Arising |

    • T. Kovachy
    • , P. Asenbaum
    •  & M. A. Kasevich

  • Letter |

    A device consisting of a metallic island connected to electrodes via tunable semiconductor-based conduction channels is used to explore the evolution of charge quantization in the presence of quantum fluctuations; the measurements reveal a robust scaling of charge quantization as the square root of the residual electron reflection probability across a quantum channel, consistent with theoretical predictions.

    • S. Jezouin
    • , Z. Iftikhar
    •  & F. Pierre

  • Letter |

    The crowd sourcing and gamification of a problem in quantum computing are described; human players succeed in solving the problem where purely numerical optimization fails, providing insight into, and a starting point for, strategies for optimization.

    • Jens Jakob W. H. Sørensen
    • , Mads Kock Pedersen
    •  & Jacob F. Sherson

  • Letter |

    By coupling donor spins in silicon to a superconducting microwave cavity and tuning the spins to the cavity resonance, the rate of spin relaxation is increased by three orders of magnitude compared to that of detuned spins; in such a regime, spontaneous emission of radiation is the dominant mechanism of spin relaxation.

    • A. Bienfait
    • , J. J. Pla
    •  & P. Bertet

  • Letter |

    Matter-wave interferometers provide an opportunity to measure whether quantum superpositions exist at macroscopic length scales or only at microscopically small scales; now such instruments have demonstrated quantum interference of wave packets separated by 54 cm.

    • T. Kovachy
    • , P. Asenbaum
    •  & M. A. Kasevich

  • Letter |

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

    • C. J. Ballance
    • , V. M. Schäfer
    •  & D. M. Lucas

  • Article |

    Entanglement, which describes non-local correlations between quantum objects, is very difficult to measure, especially in systems of itinerant particles; here spatial entanglement is measured for ultracold bosonic atoms in optical lattices.

    • Rajibul Islam
    • , Ruichao Ma
    •  & Markus Greiner

  • Letter |

    The Hong–Ou–Mandel effect is a quantum phenomenon that involves the interference of bosonic particles and demonstrates their indistinguishability; this effect has been demonstrated previously for photons and neutral atoms, and is now demonstrated for phonons, using a system of trapped ions that are promising building blocks for quantum computers.

    • Kenji Toyoda
    • , Ryoto Hiji
    •  & Shinji Urabe

  • Letter |

    Spin-entangled states between two neutral atoms in different optical tweezers are prepared by combining them in the same optical tweezer and allowing for controlled interactions, after which the particles are dynamically separated in space and their entanglement is maintained.

    • A. M. Kaufman
    • , B. J. Lester
    •  & C. A. Regal

  • Letter |

    Zero-temperature quantum phase transitions and their associated quantum critical points are believed to underpin the exotic finite-temperature behaviours of many strongly correlated electronic systems, but identifying the microscopic origins of these transitions can be challenging and controversial; Iftikhar et al. (see also the related paper by Keller et al.) show how such behaviours can be engineered into nanoelectronic quantum dots, which permit both precise experimental control of the quantum critical behaviour and its exact theoretical characterization.

    • Z. Iftikhar
    • , S. Jezouin
    •  & F. Pierre

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