Qubits 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.

  • 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

    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

  • 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

  • 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

  • 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

  • News & Views |

    Electrons trapped above the surface of solid neon can be used to create qubits using spatial states with different charge distributions. These charge qubits combine direct electric field control with long coherence times.

    • Atsushi Noguchi

  • News & Views |

    Measurements of two neighbouring silicon-based qubits show that the charge noise they each experience is correlated, suggesting a common origin. Understanding these correlations is crucial for performing error correction in these systems.

    • Łukasz Cywiński

  • Article |

    Errors in a quantum computer that are correlated between different qubits pose a considerable challenge for correction schemes. Measurements of noise in silicon spin qubits show that electric field fluctuations can create strongly correlated errors.

    • J. Yoneda
    • , J. S. Rojas-Arias
    •  & S. Tarucha

  • Article
    | Open Access

    Physical realizations of qubits are often vulnerable to leakage errors, where the system ends up outside the basis used to store quantum information. A leakage removal protocol can suppress the impact of leakage on quantum error-correcting codes.

    • Kevin C. Miao
    • , Matt McEwen
    •  & Yu Chen

  • Article |

    Electrical control of quantum mechanical oscillators is normally performed using piezoelectrics, but incorporating these additional materials can severely reduce performance. Electrostatic control has now been demonstrated in a silicon device.

    • Alkim Bozkurt
    • , Han Zhao
    •  & Mohammad Mirhosseini

  • News & Views |

    A real qubit is not an isolated unitary quantum system but is subject to noise from its environment. An experiment has now turned this interaction on its head, controlling the environment using the qubit itself.

    • Bayan Karimi
    •  & Jukka P. Pekola

  • Article |

    The performance of superconducting qubits is often limited by spurious two-level systems. Now, a qubit operating as a heat engine manipulates its bath of nearby two-level systems, providing insights into their dynamics and interactions.

    • Martin Spiecker
    • , Patrick Paluch
    •  & Ioan M. Pop

  • News & Views |

    ‘Squeezing’ of light can be used to alter the distribution of quantum noise to benefit quantum sensing and other applications. An improved design for a microwave photon squeezer provides high performance over a large bandwidth.

    • Baleegh Abdo

  • Article |

    Established methods of controlling silicon spin qubits require high-frequency signals that can be difficult to implement for various reasons. Exploiting the coupling between spin and valley degrees of freedom provides an alternative approach.

    • Xinxin Cai
    • , Elliot J. Connors
    •  & John M. Nichol

  • News & Views |

    The performance of computing devices is determined by the implementation of logical operations at the hardware level. A quantum AND gate designed using three energy levels of a superconducting circuit may speed up quantum computing algorithms.

    • Zhang Jiang

  • Article
    | Open Access

    To run algorithms on a computer they are broken down into logical operations that are implemented in hardware. A quantum logical AND gate has now been demonstrated, which could substantially improve the efficiency of near-term quantum computers.

    • Ji Chu
    • , Xiaoyu He
    •  & Dapeng Yu

  • News & Views |

    Many quantum applications require the careful preparation of quantum harmonic oscillators. The combination of a high-power microwave drive and weak nonlinearity enables fast control of such systems, with implications for quantum computing and metrology.

    • Christian Kraglund Andersen

  • Measure for Measure |

    The vast majority of devices for processing quantum information — from communication to computation and sensing — operate with quantum bits. Federico Levi tells us what makes a good qubit.

    • Federico Levi

  • News & Views |

    Trapped ion quantum computers can use two different kinds of ion to avoid crosstalk between adjacent qubits. Encoding two different qubit types in only one ion species can achieve the same goal while reducing experimental complexity.

    • Cornelius Hempel

  • Letter |

    Quantum computing with trapped ions requires qubits that can store and manipulate quantum information, and others that can be used for destructive incoherent operations. Different states of ytterbium-171 ions can be used to realize both qubit types

    • H.-X. Yang
    • , J.-Y. Ma
    •  & L.-M. Duan

  • Letter |

    Edge modes in chiral topological systems can carry quantum information without backscattering. A topological lattice of superconducting resonators has been coupled to a qubit, providing a platform for chiral quantum electrodynamics and communication.

    • John Clai Owens
    • , Margaret G. Panetta
    •  & David I. Schuster

  • Letter |

    A method to engineer higher-order interactions between photons provides a route to create non-classical and entangled states across multiple modes.

    • Srivatsan Chakram
    • , Kevin He
    •  & David I. Schuster

  • News & Views |

    Quantum computing operations are realized using acoustic devices, paving the way for a new type of quantum processor.

    • Amy Navarathna
    •  & Warwick P. Bowen

  • News & Views |

    Theoretical physicists studying black holes have produced a conjecture that random quantum circuits cannot be simplified. Now, a minimal version of this conjecture has been proven, reaching a milestone in quantum-circuit complexity theory.

    • Lorenzo Piroli

  • News & Views |

    Photon emission is a major source of decoherence for several quantum technologies. Four superconducting qubits have been combined to create a ‘dark state’ qubit with strongly suppressed photon emission due to collective interference effects.

    • Stuart J. Masson
    •  & Ana Asenjo-Garcia

  • News & Views |

    A rare-earth ion in a long-lived clock state can control a nearby ensemble of nuclear spins. Interfacing this pristine photon emitter with a small quantum processor may be a route towards making identical solid-state nodes for quantum networks.

    • Claire Le Gall

  • News & Views |

    Environmental noise can severely hinder the storage and transmission of quantum information. Experiments now reveal that trapped ions are promising candidates for reliable quantum memories.

    • Shruti Puri

  • Article |

    Physical systems with continuous degrees of freedom can be used to implement quantum error correction codes. An autonomous correction protocol has now been used to extend the lifetime of a qubit encoded in the motion of a trapped ion.

    • Brennan de Neeve
    • , Thanh-Long Nguyen
    •  & Jonathan P. Home

  • News & Views |

    The physics of large systems is often understood as the outcome of the local operations among its components. Now, it is shown that this picture may be incomplete in quantum systems whose interactions are constrained by symmetries.

    • Álvaro M. Alhambra

  • News & Views |

    The dynamics of quantum information and entanglement is closely linked to the physics of thermalization. A quantum simulator comprised of superconducting qubits has measured the spread of quantum information in a many-body system.

    • A. Safavi-Naini

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