Quantum information articles within Nature

Featured

  • Article |

    A modular quantum system-on-chip architecture integrates thousands of individually addressable spin qubits in two-dimensional quantum microchiplet arrays into an integrated circuit designed for cryogenic control, supporting full connectivity for quantum memory arrays across spin–photon channels.

    • Linsen Li
    • , Lorenzo De Santis
    •  & Dirk Englund

  • Article |

    Boson sampling using ultracold atoms in a two-dimensional, tunnel-coupled optical lattice is enabled by high-fidelity programmable control with optical tweezers of a large number of atoms trapped in an optical lattice.

    • Aaron W. Young
    • , Shawn Geller
    •  & Adam M. Kaufman

  • Article
    | Open Access

    Using an optical resonator containing two individually addressable atoms in a single cavity, fusion of deterministically generated photonic graph states to create ring and tree graph states with up to eight qubits is demonstrated.

    • Philip Thomas
    • , Leonardo Ruscio
    •  & Gerhard Rempe

  • News & Views |

    By adapting methods for fabricating and testing conventional computer chips, researchers have brought silicon-based quantum computers closer to reality — and to accessing the immense benefits of a mature chipmaking industry.

    • Ruoyu Li

  • Article
    | Open Access

    By emulating a 2D hard-core Bose–Hubbard lattice using a controllable 4 × 4 array of superconducting qubits, volume-law entanglement scaling as well as area-law scaling at different locations in the energy spectrum are observed.

    • Amir H. Karamlou
    • , Ilan T. Rosen
    •  & William D. Oliver

  • Article
    | Open Access

    An end-to-end quantum error correction protocol that implements fault-tolerant memory on the basis of a family of low-density parity-check codes shows the possibility of low-overhead fault-tolerant quantum memory within the reach of near-term quantum processors.

    • Sergey Bravyi
    • , Andrew W. Cross
    •  & Theodore J. Yoder

  • Article
    | Open Access

    Fidelity benchmarking of an analogue quantum simulator reaches a high-entanglement regime where exact classical simulation of quantum systems becomes impractical, and enables a new method for evaluating the mixed-state entanglement of quantum devices.

    • Adam L. Shaw
    • , Zhuo Chen
    •  & Manuel Endres

  • Article
    | Open Access

    A micro-fabricated Penning trap that operates at a 3 T magnetic field demonstrates full quantum control of an ion and the ability to transport the ion arbitrarily in the trapping plane above the chip.

    • Shreyans Jain
    • , Tobias Sägesser
    •  & Jonathan Home

  • Research Briefing |

    Non-Abelian anyons are emergent quasiparticles found in exotic quantum states of matter, which could have applications in fault-tolerant topological quantum computing. But performing the manipulations necessary to make these quasiparticles has proved a challenge — now overcome through a happy confluence of theoretical and experimental innovation.

  • News & Views |

    Small groups of mobile neutral atoms have been manipulated with extraordinary control to form ‘logical’ quantum bits. These qubits can perform quantum computations more reliably than can individual atoms.

    • Barbara M. Terhal

  • Article
    | Open Access

    A scheme to prepare a magic state, an important ingredient for quantum computers, on a superconducting qubit array using error correction is proposed that produces better magic states than those that can be prepared using the individual qubits of the device.

    • Riddhi S. Gupta
    • , Neereja Sundaresan
    •  & Benjamin J. Brown

  • Research Briefing |

    Electron spin resonance is a standard method for studying the structure of chemical compounds, and it can also be used to control quantum spin states. Combining electron spin resonance with atomic force microscopy allows single spins to be manipulated in single molecules — with potential applications in quantum computing and elsewhere.

  • 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

    A programmable quantum processor based on encoded logical qubits operating with up to 280 physical qubits is described, in which improvement of algorithmic performance using a variety of error-correction codes is enabled.

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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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 |

    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 |

    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

  • 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

  • News & Views |

    Superconducting quantum bits, a promising platform for future quantum computers, have been entangled over a separation of 30 metres, with a performance that enabled the demonstration of a milestone in quantum physics.

    • Marissa Giustina

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