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So far, quantum state tomography has been used for the characterization of quantum states, with which the system can be completely described. This method, however, involves a very high measuring and computing effort and is not suitable for systems with more than half a dozen particles. Two years ago, the researchers led by Christian Roos, together with colleagues from Germany and Great Britain, presented a very efficient method for the characterization of complex quantum states. However, only weakly entangled states can be described with this method. This issue is now circumvented by a new method presented last year by the theorists led by Peter Zoller, which can be used to characterize any entangled state. Together with experimental physicists Rainer Blatt and Christian Roos and their team, they have now demonstrated this method in the laboratory.
"The new method is based on the repeated measurement of randomly selected transformations of individual particles. The statistical evaluation of the measurement results then provides information about the degree of entanglement of the system," explains Andreas Elben from Peter Zoller's team. The Austrian physicists demonstrated the process in a quantum simulator consisting of several ions arranged in a row in a vacuum chamber. Starting from a simple state, the researchers let the individual particles interact with the help of laser pulses and thus generate entanglement in the...
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