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<div>This week's MIT QIP seminar will take place on Monday, September
29 at 16:00 hours in MIT room 4-270, and features:</div>
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<div align="center"><font size="+2"><b>Quantum Gaussian
Noise</b></font></div>
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<div align="center"><font size="+1"><i>by</i> Prof. Jeff Shapiro,
MIT (<i>EECS and the Research Laboratory of
Electronics</i>)</font></div>
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<div align="center"><u>ABSTRACT</u></div>
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<blockquote>In semiclassical theory, light is a classical
electromagnetic wave and the fundamental source of photodetection
noise is the shot effect arising from the discreteness of the electron
charge. In quantum theory, light is a quantum-mechanical entity and
the fundamental source of photodetection noise comes from measuring
the photon-flux operator. The Glauber coherent states are Gaussian
quantum states which represent classical electromagnetic radiation.
Quantum photodetection of these states yields statistics that are
indistinguishable from the corresponding Poisson point-process results
of semiclassical photodetection. Optical parametric interactions,
however, can be used to produce other Gaussian quantum states, states
whose photodetection behavior cannot be characterized semiclassically.
A unified analytical framework is presented for Gaussian-state
photodetection that includes the full panoply of nonclassical effects
that have been produced via parametric interactions.</blockquote>
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