Volume 11 Issue 3, March 2016

Volume 11 Issue 3

A violation of the so-called Bell inequality represents a strong proof of the ability to create and control quantum states of a pair of quantum bits with no classical analogues. Andrea Morello and co-workers have now demonstrated a violation of Bell’s inequality in a pair of qubits in silicon, encoded in the electron spin and the nuclear spin associated with a single phosphorus donor embedded in a nanoelectronic device. The cover image is an artist’s impression of visual fragments mapped spatially from data directly extracted from the measurement of the quantum state of the phosphorus atom. It expresses the creation of entangled qubits that lie at the heart of quantum computation.

Letter p242; News & Views p216

IMAGE: PAUL THOMAS (UNSW), IN COLLABORATION WITH K. RAXWORTHY (CURTIN UNIV.), A. MORELLO AND J. P. DEHOLLAIN (UNSW)

COVER DESIGN: BETHANY VUKOMANOVIC

Editorial

  • Editorial |

    Reliable and consistent technological achievements are required for the development of quantum technologies.

  • Editorial |

    Although undetectable by macroscopic magnetic probes, antiferromagnetic order could be used in future spintronic devices.

Commentary

  • Commentary |

    Increasing globalization means that traditional occupational epidemiological approaches may no longer apply, suggesting a need for an alternative model to assess the long-term impact of nanomaterial exposure on health.

    • Michaela Kendall
    •  & Iseult Lynch

Correction

Thesis

  • Thesis |

    The potential risks surrounding nanotechnology can often appear complex and confusing. But with some basic guideposts, argues Andrew D. Maynard, navigating them can become a little easier.

    • Andrew D. Maynard

Research Highlights

News & Views

  • News & Views |

    Cowpea mosaic virus nanoparticles can induce the immune system to clear metastatic cancers.

    • Pier Paolo Peruzzi
    •  & E. Antonio Chiocca
  • News & Views |

    With fast, adaptive control over the spin of a single electron, magnetic fields can now be measured at the very limits allowed by quantum physics.

    • Stephen D. Bartlett
  • News & Views |

    An entangled state of two spin qubits in silicon has been prepared and measured, yielding a violation of Bell's inequality that is the largest achieved in the solid state so far.

    • Susan Coppersmith

Review Article

  • Review Article |

    This article reviews recent progress in the use of graphene and other two-dimensional atomic crystals in catalytic applications, highlighting the activity and potential of heterogeneous systems such as van der Waals heterostructures.

    • Dehui Deng
    • , K. S. Novoselov
    • , Qiang Fu
    • , Nanfeng Zheng
    • , Zhongqun Tian
    •  & Xinhe Bao
  • Review Article |

    This article reviews efforts to control and monitor the magnetization in antiferromagnetic materials, as well as the prospects for antiferromagnetic spintronics applications.

    • T. Jungwirth
    • , X. Marti
    • , P. Wadley
    •  & J. Wunderlich

Letter

  • Letter |

    A violation of Bell's inequality, which is a direct proof of entanglement, can be observed in the solid state using the electron and nuclear spins of a single phosphorus atom in silicon.

    • Juan P. Dehollain
    • , Stephanie Simmons
    • , Juha T. Muhonen
    • , Rachpon Kalra
    • , Arne Laucht
    • , Fay Hudson
    • , Kohei M. Itoh
    • , David N. Jamieson
    • , Jeffrey C. McCallum
    • , Andrew S. Dzurak
    •  & Andrea Morello
  • Letter |

    The sensitivity of electron spin resonance has been improved up to the quantum limit through the use of a Josephson parametric microwave amplifier combined with high-quality-factor superconducting microresonators cooled at millikelvin temperatures.

    • A. Bienfait
    • , J. J. Pla
    • , Y. Kubo
    • , M. Stern
    • , X. Zhou
    • , C. C. Lo
    • , C. D. Weis
    • , T. Schenkel
    • , M. L. W. Thewalt
    • , D. Vion
    • , D. Esteve
    • , B. Julsgaard
    • , K. Mølmer
    • , J. J. L. Morton
    •  & P. Bertet
  • Letter |

    Cantilevers made of SrTiO3 grown on silicon use the flexoelectric effect to achieve electromechanical performances similar to piezoelectric bimorph cantilevers.

    • Umesh Kumar Bhaskar
    • , Nirupam Banerjee
    • , Amir Abdollahi
    • , Zhe Wang
    • , Darrell G. Schlom
    • , Guus Rijnders
    •  & Gustau Catalan
  • Letter |

    Air-stable monolayers of diamondoids can rival cesium's work-function-lowering ability and can dramatically increase field emission current through a radical cation mechanism.

    • Karthik Thimmavajjula Narasimha
    • , Chenhao Ge
    • , Jason D. Fabbri
    • , William Clay
    • , Boryslav A. Tkachenko
    • , Andrey A. Fokin
    • , Peter R. Schreiner
    • , Jeremy E. Dahl
    • , Robert M. K. Carlson
    • , Z. X. Shen
    •  & Nicholas A. Melosh

Article

  • Article |

    A single layer of La atoms placed on the tip of a LaB6 nanowire suppresses chemical reactions and promotes emission of free electrons, creating an electron source with very low noise and high stability.

    • Han Zhang
    • , Jie Tang
    • , Jinshi Yuan
    • , Yasushi Yamauchi
    • , Taku T. Suzuki
    • , Norio Shinya
    • , Kiyomi Nakajima
    •  & Lu-Chang Qin
  • Article |

    The synchronization between nanocontact oscillators can be promoted by purposefully taking advantage of Oersted field-induced spin-wave beams, thus allowing synchronization of at least five oscillators.

    • A. Houshang
    • , E. Iacocca
    • , P. Dürrenfeld
    • , S. R. Sani
    • , J. Åkerman
    •  & R. K. Dumas
  • Article |

    By adapting DNA strand displacement and exchange reactions to mammalian cells, DNA circuitry is developed that can directly interact with a native mRNA.

    • Benjamin Groves
    • , Yuan-Jyue Chen
    • , Chiara Zurla
    • , Sergii Pochekailov
    • , Jonathan L. Kirschman
    • , Philip J. Santangelo
    •  & Georg Seelig

In the Classroom

  • In the Classroom |

    A joint research platform is a great playground for young researchers to combine fundamental and applied research, says Diana Nanova.

    • Diana Nanova
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