Qubits

Definition

Qubits or quantum bits are the fundamental building block for quantum information processes. Whereas conventional computers store and process data as a series of ‘1’s and ‘0’s, quantum computers use the properties of a quantum system, such as the polarization of a photon or the spin of an electron.

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Latest Research and Reviews

  • Research | | open

    Geometric phase is of fundamental interest and has practical application in quantum computation. Here the authors observe continuous-variable geometric phase in a superconducting circuit and demonstrate a multi-qubit controlled phase gate protocol based on this geometric effect.

    • Chao Song
    • , Shi-Biao Zheng
    • , Pengfei Zhang
    • , Kai Xu
    • , Libo Zhang
    • , Qiujiang Guo
    • , Wuxin Liu
    • , Da Xu
    • , Hui Deng
    • , Keqiang Huang
    • , Dongning Zheng
    • , Xiaobo Zhu
    •  & H. Wang
  • Research | | open

    State-of-the-art methods for sensing weak AC fields are only efficient in the low frequency domain. Here, Stark et al. demonstrate a sensing scheme that is capable of probing high frequencies through continuous dynamical coupling by applying it to a nitrogen-vacancy centre in diamond.

    • Alexander Stark
    • , Nati Aharon
    • , Thomas Unden
    • , Daniel Louzon
    • , Alexander Huck
    • , Alex Retzker
    • , Ulrik L. Andersen
    •  & Fedor Jelezko
  • Research | | open

    In silicon, quantum information can be stored in donors or quantum dots, each with its advantages and limitations—particularly in terms of fabrication. Here the authors coherently couple a phosphorous donor’s electron spin to a quantum dot, encoding information in the hybrid two-electron system’s state.

    • Patrick Harvey-Collard
    • , N. Tobias Jacobson
    • , Martin Rudolph
    • , Jason Dominguez
    • , Gregory A. Ten Eyck
    • , Joel R. Wendt
    • , Tammy Pluym
    • , John King Gamble
    • , Michael P. Lilly
    • , Michel Pioro-Ladrière
    •  & Malcolm S. Carroll
  • Research | | open

    In this work, Manenti et al. present measurements of a device in which a tuneable transmon qubit is piezoelectrically coupled to a surface acoustic wave cavity, realising circuit quantum acoustodynamic architecture. This may be used to develop new quantum acoustic devices.

    • Riccardo Manenti
    • , Anton F. Kockum
    • , Andrew Patterson
    • , Tanja Behrle
    • , Joseph Rahamim
    • , Giovanna Tancredi
    • , Franco Nori
    •  & Peter J. Leek

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