• A new method for quantum computing

    From ScienceDaily@1:317/3 to All on Mon Jan 31 21:30:44 2022
    A new method for quantum computing
    QuSoft and IoP researchers propose a new method for quantum computing in trapped ions

    Date:
    January 31, 2022
    Source:
    Universiteit van Amsterdam
    Summary:
    Physicists have proposed a new architecture for a scalable quantum
    computer. Making use of the collective motion of the constituent
    particles, they were able to construct new building blocks for
    quantum computing that pose fewer technical difficulties than
    current state-of- the art methods.



    FULL STORY ========================================================================== Physicists from the University of Amsterdam have proposed a new
    architecture for a scalable quantum computer. Making use of the
    collective motion of the constituent particles, they were able to
    construct new building blocks for quantum computing that pose fewer
    technical difficulties than current state-of- the art methods. The
    results were recently published in Physical Review Letters.


    ==========================================================================
    The researchers work at QuSoft and the Institute of Physics in the groups
    of Rene Gerritsma and Arghavan Safavi-Naini. The effort, which was led by
    the PhD candidate Matteo Mazzanti, combines two important ingredients. One
    is a so- called trapped-ion platform, one of the most promising candidates
    for quantum computing that makes use of ions -- atoms that have either
    a surplus or a shortage of electrons and as a result are electrically
    charged. The other is the use of a clever method to control the ions
    supplied by optical tweezers and oscillating electric fields.

    As the name suggests, trapped-ion quantum computers use a crystal of
    trapped ions. These ions can move individually, but more importantly,
    also as a whole.

    As it turns out, the possible collective motions of the ions facilitate
    the interactions between individual pairs of ions. In the proposal, this
    idea is made concrete by applying a uniform electric field to the whole crystal, in order to mediate interactions between two specific ions in
    that crystal. The two ions are selected by applying tweezer potentials on
    them -- see the image above. The homogeneity of the electric field assures
    that it will only allow the two ions to move together with all other
    ions in the crystal. As a result, the interaction strength between the
    two selected ions is fixed, regardless of how far apart the two ions are.

    A quantum computer consists of 'gates', small computational building
    blocks that perform quantum analogues of operations like 'and' and
    'or' that we know from ordinary computers. In trapped-ion quantum
    computers, these gates act on the ions, and their operation depends on
    the interactions between these particles. In the above setup, the fact
    that those interactions do not depend on the distance means that also
    the duration of operation of a gate is independent of that distance. As
    a result, this scheme for quantum computing is inherently scalable,
    and compared to other state-of-the-art quantum computing schemes poses
    fewer technical challenges for achieving comparably well- operating
    quantum computers.

    ========================================================================== Story Source: Materials provided by Universiteit_van_Amsterdam. Note:
    Content may be edited for style and length.


    ========================================================================== Related Multimedia:
    * Two_trapped_ions_selected_by_optical_tweezers ========================================================================== Journal Reference:
    1. M. Mazzanti, R. X. Schu"ssler, J. D. Arias Espinoza,
    Z. Wu,
    R. Gerritsma, A. Safavi-Naini. Trapped Ion Quantum Computing Using
    Optical Tweezers and Electric Fields. Physical Review Letters,
    2021; 127 (26) DOI: 10.1103/PhysRevLett.127.260502 ==========================================================================

    Link to news story: https://www.sciencedaily.com/releases/2022/01/220131110459.htm

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