Quantum physics articles within Nature Physics

Featured

  • Article
    | Open Access

    A successful silicon spin qubit design should be rapidly scalable by benefiting from industrial transistor technology. This investigation of exchange interactions between two FinFET qubits provides a guide to implementing two-qubit gates for hole spins.

    • Simon Geyer
    • , Bence Hetényi
    •  & Andreas V. Kuhlmann

  • Research Briefing |

    A practical and hardware-efficient blueprint for fault-tolerant quantum computing has been developed, using quantum low-density-parity-check codes and reconfigurable neutral-atom arrays. The scheme requires ten times fewer qubits and paves the way towards large-scale quantum computing using existing experimental technologies.

  • News & Views |

    Questioning the validity of axioms can teach us about physics beyond the standard model. A recent search for the violation of charge conservation and the Pauli exclusion principle yields limits on these scenarios.

    • Alessio Porcelli

  • Comment |

    The time has come to consider appropriate guardrails to ensure quantum technology benefits humanity and the planet. With quantum development still in flux, the science community shares a responsibility in defining principles and practices.

    • Urs Gasser
    • , Eline De Jong
    •  & Mauritz Kop

  • Article
    | Open Access

    Leggett modes can occur when superconductivity arises in more than one band in a material and represent oscillation of the relative phases of the two superconducting condensates. Now, this mode is observed in Cd3As2, a Dirac semimetal.

    • Joseph J. Cuozzo
    • , W. Yu
    •  & Enrico Rossi

  • News & Views |

    The Hamiltonian describing a quantum many-body system can be learned using measurements in thermal equilibrium. Now, a learning algorithm applicable to many natural systems has been found that requires exponentially fewer measurements than existing methods.

    • Sitan Chen

  • Article |

    Despite being essential to many applications in quantum science, entanglement can be easily disrupted by decoherence. A protocol based on repetitive quantum error correction now demonstrates enhanced coherence times of entangled logical qubits.

    • Weizhou Cai
    • , Xianghao Mu
    •  & Luyan Sun

  • Perspective |

    Quantum computers promise to efficiently predict the structure and behaviour of molecules. This Perspective explores how this could overcome existing challenges in computational drug discovery.

    • Raffaele Santagati
    • , Alan Aspuru-Guzik
    •  & Clemens Utschig-Utschig

  • Article
    | Open Access

    Photon-mediated entanglement in atomic ensembles coupled to cavities enables the engineering of quantum states with a graph-like entanglement structure. This offers potential advantages in quantum computation and metrology.

    • Eric S. Cooper
    • , Philipp Kunkel
    •  & Monika Schleier-Smith

  • Article
    | Open Access

    Combining multiparticle levitation with cavity control enables cavity-mediated interaction between levitated nanoparticles, whose strength can be tailored via optical detuning and position of the two particles.

    • Jayadev Vijayan
    • , Johannes Piotrowski
    •  & Lukas Novotny

  • Article |

    Most applications of surface plasmons are based on their near-field properties. These properties are now shown to be governed by nonclassical scattering between multiparticle plasmonic subsystems.

    • Mingyuan Hong
    • , Riley B. Dawkins
    •  & Omar S. Magaña-Loaiza

  • News & Views |

    Some quantum acoustic resonators possess a large number of phonon modes at different frequencies. Direct interactions between modes similar to those available for photonic devices have now been demonstrated. This enables manipulation of multimode states.

    • Audrey Bienfait

  • Article
    | Open Access

    The standard current–phase relation in tunnel Josephson junctions involves a single sinusoidal term, but real junctions are more complicated. The effects of higher Josephson harmonics have now been identified in superconducting qubit devices.

    • Dennis Willsch
    • , Dennis Rieger
    •  & Ioan M. Pop

  • News & Views |

    Quantum simulators can provide new insights into the complicated dynamics of quantum many-body systems far from equilibrium. A recent experiment reveals that underlying symmetries dictate the nature of universal scaling dynamics.

    • Maximilian Prüfer

  • Article
    | Open Access

    Quantum gates require controlled interactions between different degrees of freedom. A tunable coupling has now been demonstrated between the phonon modes of a mechanical resonator designed for storing and manipulating quantum information.

    • Uwe von Lüpke
    • , Ines C. Rodrigues
    •  & Yiwen Chu

  • Article |

    Raman sideband cooling is a method used to prepare atoms and ions in their vibrational ground state. This technique has now been extended to molecules trapped in optical tweezer arrays.

    • Yukai Lu
    • , Samuel J. Li
    •  & Lawrence W. Cheuk

  • News & Views |

    Quasicrystals are ordered but not periodic, which makes them fascinating objects at the interface between order and disorder. Experiments with ultracold atoms zoom in on this interface by driving a quasicrystal and exploring its fractal properties.

    • Julian Léonard

  • Article |

    The kernel method in machine learning can be implemented on near-term quantum computers. A 27-qubit device has now been used to solve learning problems using kernels that have the potential to be practically useful.

    • Jennifer R. Glick
    • , Tanvi P. Gujarati
    •  & Kristan Temme

  • Article
    | Open Access

    Phases of matter can host different transport behaviours, ranging from diffusion to localization. Anomalous transport has now been observed in an interacting Bose gas in a one-dimensional lattice subject to a pulsed incommensurate potential.

    • Toshihiko Shimasaki
    • , Max Prichard
    •  & David M. Weld

  • Article
    | Open Access

    External driving of qubits can exploit their nonlinearity to generate different forms of interqubit interactions, broadening the capabilities of the platform.

    • Long B. Nguyen
    • , Yosep Kim
    •  & Irfan Siddiqi

  • Measure for Measure |

    Quantum technologies change our notion of measurement. Chenyu Wang elaborates on how quantum squeezing enhances the precision of gravitational-wave interferometers.

    • Chenyu Wang

  • News & Views |

    Scalable quantum computers require quantum error-correcting codes that can robustly store information. Exploiting the structure of well-known classical codes may help create more efficient approaches to quantum error correction.

    • Anirudh Krishna

  • Article
    | Open Access

    Large quantum computers will require error correcting codes, but most proposals have prohibitive requirements for overheads in the number of qubits, processing time or both. A way to combine smaller codes now gives a much more efficient protocol.

    • Hayata Yamasaki
    •  & Masato Koashi

  • News & Views |

    Optical atomic clocks are extremely accurate sensors despite the poor use of their resources. A parallel quantum control approach might help to optimize the resources of optical atomic clocks, which could lead to an exponential improvement in their performance.

    • Simone Colombo

  • Article
    | Open Access

    Addressing optical transitions at the level of a single site is crucial to unlock the potential of quantum computers and atomic clocks. A scheme based on atom rearrangement now demonstrates such control with demonstrable metrological benefits.

    • Adam L. Shaw
    • , Ran Finkelstein
    •  & Manuel Endres

  • News & Views |

    Precise frequencies of nearly forbidden transitions have been ascertained in the simplest molecule, the molecular hydrogen ion. This work offers a new perspective on precision measurements and fundamental physical tests with molecular spectroscopy.

    • Xin Tong

  • Article |

    It has been suggested that Gaussian boson sampling may provide a quantum computational advantage for calculating the vibronic spectra of molecules. Now, an equally efficient classical algorithm has been identified.

    • Changhun Oh
    • , Youngrong Lim
    •  & Liang Jiang

  • Article |

    An error detecting code running on a trapped-ion quantum computer protects expressive circuits of eight logical qubits with a high-fidelity and partially fault-tolerant implementation of a universal gate set.

    • Chris N. Self
    • , Marcello Benedetti
    •  & David Amaro

  • Article |

    The Haldane model is a paradigmatic example of topological behaviour but has not previously been implemented in condensed-matter experiments. Now a moiré bilayer is shown to realize this model with the accompanying quantized transport response.

    • Wenjin Zhao
    • , Kaifei Kang
    •  & Kin Fai Mak

  • Comment |

    Quantum hypothesis testing—the task of distinguishing quantum states—enjoys surprisingly deep connections with the theory of entanglement. Recent findings have reopened the biggest questions in hypothesis testing and reversible entanglement manipulation.

    • Mario Berta
    • , Fernando G. S. L. Brandão
    •  & Marco Tomamichel

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