Parametric Down-Conversion: The Twins are born for a Life of Entanglement
The existence of quantum entanglement is what makes quantum physics different from classical physics. First introduced by Schrödinger in his discussion of the famous cat paradox , the amazing effects of quantum entanglement are very counter-intuitive and sometimes mind-boggling. As a pioneer and an expert in both classical and quantum coherence theory, Mandel is the right person to use light for the exploration of quantum entanglement. Among many of Mandel’s contributions, the pioneering work and subsequent development on parametric down-conversion (PDC) opened up a whole field of research to experimentally observe the phenomena of quantum entanglement. Today, in the newly established field of quantum information science, quantum entanglement has become an essential ingredient in basically all the discussions. Schrödinger may have been the first person to mention the word of “Entanglement”, but it was Mandel who first demonstrated it experimentally and created further a variety of different entangled states, which include entangled states of polarization, of frequency, and of phase variables. Besides quantum entanglement, Mandel also exploited PDC in the study of fundamental physics as well as practical applications in optical communication.
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