[QIP-Sem] MIT QIP Seminar Announcement

[QIP-Sem Mailing List]

This week's MIT QIP seminar will take place on Monday, September 29 
at 16:00 hours in MIT room 4-270, and features:


Quantum Gaussian Noise

by Prof. Jeff Shapiro, MIT (EECS and the Research Laboratory of Electronics)

ABSTRACT

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.
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