Published: 04 July 2013

Paper published in Nature on "the effect of a quantum light"

Written by Eran Ginossar, the paper focuses on extending the coherence lifetime of the quantum bit state.

Next generation computing and information processing will be defined on how fast and how much information can be processed in real-time. Quantum information processing offers a step change in speed and quantity of data processed from state of the art computers of today. A long-standing theory about the way in which quantum light interacts with matter has now been proven experimentally, potentially yielding a method for improving the fidelity of quantum computations.

Researchers from the University of California Berkeley, MIT and University of Surrey have devised an experiment to demonstrate a fundamental component of quantum optics. This is an effect caused by the interaction of quantum light with a trapped single atom. To generate a well-controlled environment, the team used an artificial atom, and subjected it to so-called ‘squeezed light’, in which the quantum fluctuations of the electric field can be substantially reduced compared to the empty vacuum (where no photons exist).

The results, published in the journal Nature, represent a breakthrough in experimental methods and manipulation of the external environment for future quantum computers. To achieve their output, the scientists generated a quantum state of light of high quality, coupled the light energy efficiently into the measurement setup and theoretically proved that their setup is indeed producing sound scientific data. The precise control over the environment has direct applications to the emerging field of quantum information processing. Quantum light could also be used to prepare the initial state of a series of quantum bits (qubits), effectively acting as a programming device.

For more information please refer to the online publication page and for further questions please contact Dr Eran Ginossar.

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