Quantum cryptography. Eye of an observer reflected in a mirror in quantum cryptography apparatus. Quantum cryptography is based on the principle of entanglement, a property of a pair of particles in which a change to one has an instantaneous effect on the other, no matter how far apart they are. Cryptography in this case refers to the encoding of data so that only specified targets can access it. If the sender and the receiver of the data share entanglement then any data is only readable by them alone. This is more secure than existing encryption methods, most of which rely on mathematical algorithms. Photographed at the lab of Anton Zeilinger at Vienna University, Austria.
Science Photo Library was founded in 1981 by Michael Marten, one of the authors of "Worlds Within Worlds", a book exploring different ways to observe the universe - from electron micrographs, to images of earthrise taken from the Apollo spacecraft. When Marten started receiving requests for the beautiful images in the book, he had an idea of setting up Science Photo Library.
Since then, Science Photo Library has continued to work alongside world acclaimed photographers and the leading science and medical experts to provide a central source of the best science and specialist imagery available. Although the collection started with scientific images, it has grown to encompass all aspects of science and their impact on everyday life.
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