Quantum dots

Quantum dots are crystals of a fluorescent semiconductor material with a diameter of as few as 10 to 100 atoms (2-10 nm). They are used as labels for imaging molecules because of their very narrow fluorescence spectra, brightness and resistance to photobleaching.

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Latest Research and Reviews

  • Reviews |

    The droplet epitaxy technique has emerged as an alternative to the most commonly used Stranski–Krastanov for fabricating semiconductor nanostructures. This Review discusses the important aspects of droplet epitaxy quantum dots, from the growth mechanism to device application.

    • Massimo Gurioli
    • , Zhiming Wang
    • , Armando Rastelli
    • , Takashi Kuroda
    •  & Stefano Sanguinetti
  • Research |

    Gate reflectometry on an ancillary dot coupled to an electron reservoir is used to read the spin of a qubit in a CMOS device in a single shot with an average fidelity above 98% within 0.5 ms.

    • Matias Urdampilleta
    • , David J. Niegemann
    • , Emmanuel Chanrion
    • , Baptiste Jadot
    • , Cameron Spence
    • , Pierre-André Mortemousque
    • , Christopher Bäuerle
    • , Louis Hutin
    • , Benoit Bertrand
    • , Sylvain Barraud
    • , Romain Maurand
    • , Marc Sanquer
    • , Xavier Jehl
    • , Silvano De Franceschi
    • , Maud Vinet
    •  & Tristan Meunier
  • Research |

    Two-qubit logic gates in a silicon-based system are shown (using randomized benchmarking) to have high gate fidelities of operation and are used to generate Bell states, a step towards solid-state quantum computation.

    • W. Huang
    • , C. H. Yang
    • , K. W. Chan
    • , T. Tanttu
    • , B. Hensen
    • , R. C. C. Leon
    • , M. A. Fogarty
    • , J. C. C. Hwang
    • , F. E. Hudson
    • , K. M. Itoh
    • , A. Morello
    • , A. Laucht
    •  & A. S. Dzurak
    Nature 569, 532-536
  • Research |

    Magneto-optical spectroscopy shows that the dark exciton state in single formamidinium lead bromide perovskite nanocrystals is located below the bright exciton triplet. Slow bright-to-dark relaxation explains the intense brightness of the nanoparticles.

    • Philippe Tamarat
    • , Maryna I. Bodnarchuk
    • , Jean-Baptiste Trebbia
    • , Rolf Erni
    • , Maksym V. Kovalenko
    • , Jacky Even
    •  & Brahim Lounis
  • Research | | open

    The field of wavefunction engineering using intraband transition to design infrared devices has been limited to epitaxially grown semiconductors. Here the authors demonstrate that a device with similar energy landscape can be obtained from a mixture of colloidal quantum dots made of HgTe and HgSe.

    • Clément Livache
    • , Bertille Martinez
    • , Nicolas Goubet
    • , Charlie Gréboval
    • , Junling Qu
    • , Audrey Chu
    • , Sébastien Royer
    • , Sandrine Ithurria
    • , Mathieu G. Silly
    • , Benoit Dubertret
    •  & Emmanuel Lhuillier

News and Comment

  • News and Views |

    A magnetic-field-dependent spectroscopy study on single perovskite nanocrystals reveals the spectral signatures of an exciton dark state below the bright triplet states.

    • Andries Meijerink
    •  & Freddy T. Rabouw
  • News and Views |

    A semiconductor quantum dot that generates polarization-entangled photon pairs on demand has been realized, marking an important milestone for scalable integrated quantum photonics and information processing.

    • Igor Aharonovich
  • News and Views |

    Through stochastic resonance, noise-driven fluctuations make an otherwise weak periodic signal accessible. Experiments have now reported quantum stochastic resonance, which arises from intrinsic quantum fluctuations rather than external noise.

    • Stefan Ludwig
    Nature Physics 15, 310-311