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Follow on Google News | How to Reverse Unknown Quantum ProcessesTime evolution of a single photon reversed with a universal rewinding protocol and a quantum switch.
By: University of Vienna Everyday life is full of changes that are well understood, yet practically impossible to reverse, for example, the metamorphosis of a dandelion into a blowball. However, one could imagine undoing this transformation, step by step, if one knew precisely how each molecule in the plant moved in time. In the quantum realm the problem gets even trickier: one of the core principles of quantum physics is that simply observing a system causes it to change. This makes it impossible, even in principle, to track a system's change in time and reverse the process. However, at the same time, the laws of quantum mechanics also open up new possibilities such as universal rewinding protocols. These allow for reversing changes in a quantum system without knowing what they were. In a collaboration between the University of Vienna and IQOQI Vienna, experimental physicists headed by Philip Walther have successfully implemented such a universal rewinding protocol developed by theoretical physicists led by Miguel Navascués. More Info here: https://medienportal.univie.ac.at/ Contact information: Univ.-Prof. Dipl.-Ing. Dr. Philip Walther Quantum Optics, Quantum Nanophysics and Quantum Information University of Vienna 1090 Vienna, Austria, Boltzmanngasse 5 T +43-1-4277-72560 M +43-664-60277- E philip.walther@ W https://walther.quantum.at/ Press contact: Mag. Alexandra Frey Press and Information Office of the University of Vienna Universitätsring 1, 1010 Vienna T +43-1-4277-175 33 E alexandra.frey@ W www.univie.ac.at International Distribution: Dr. Barbara Bauder PR&D – Public Relations for Research & Education Kollersteig 68, 3400 Klosterneuburg M +43-664-1576- E bauder@prd.at W www.prd.at End
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