The Purcell effect can also be useful for modeling single-photon sources for Quantum cryptography.
In 1990, independently and initially unaware of the earlier work, Artur Ekert, then a Ph.D. student at Wolfson College, University of Oxford, developed a different approach to quantum key distribution based on peculiar quantum correlations known as quantum entanglement.
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Quantum cryptography was proposed first by Stephen Wiesner, then at Columbia University in New York, who, in the early 1970s, introduced the concept of quantum conjugate coding.
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For his discovery of quantum cryptography he was awarded the 1995 Maxwell Medal and Prize by the Institute of Physics and the 2007 Hughes Medal by the Royal Society.