• Feb 01 2012

    Stellenbosch Node Seminar

    NITheP cordially invites you to a seminar by:

    Prof Artur Ekert
    Professor of Quantum Physics
    Mathematical Institute, University of Oxford
    Lee Kong Chian Centennial Professor National University of Singapore

    Date: Wednesday 01st of February 2012

    Time: 14:00

    Venue: NITheP Stellenbosch Seminar room

    TITLE: A powerful twist on quantum cryptography

    ABSTRACT: Human desire to communicate secretly is at least as old as
    writing itself and goes back to the beginnings of our civilisation.
    Over the centuries many ingenious methods of secret communication have
    been developed, only to be matched by the ingenuity of code-breakers.
    As a result, the quest for a perfect, unbreakable, cipher, had been
    declared a futile pursuit. That is, until recently!
    Recent research shows that the security of communication can be
    guaranteed using peculiar “non local correlations”. Such correlations
    are typically found in the behaviour of quantum particles, and the
    work builds on schemes that I and others invented decades ago to do
    quantum cryptography – adding a powerful twist that we hadn’t
    anticipated. By including a mathematical measure known as a ‘Bell
    inequality’ that detects non-local correlations, these newer
    cryptography schemes make a seemingly insane scenario possible –
    devices of unknown or dubious provenance, even those that are
    manufactured by our enemies, can be safely used for secure
    communication, including key distribution. This is a truly remarkable
    feat, also referred to as “device independent cryptography”.
    All that is needed to implement this bizarre and powerful form of
    cryptography is a loophole-free test of a Bell's inequality. It is on
    the edge of being technologically feasible. I will provide a brief
    overview of the intriguing connections between Bell's inequality and
    cryptography and describe how studies of quantum entanglement and the
    foundations of quantum theory influence the way we may soon protect

    RECOMMENDED READING: Semi-popular article titled "Less reality, more
    security" available at http://www.arturekert.org/Site/Varia.html.
    Abbreviated version published in Physics World, September 2009.

    Enquiries: Prof M Kastner
    Tel: 021 808 3863
    Email: kastner@sun.ac.za

    Download pdf file