Abstract
Single photons for purposes of quantum information are frequently created by spontaneous emission. Due to the random emission angle, collecting the emitted photon poses limits to the efficiency of such sources. Another recently proposed qubit is the photon-hole (PH) [1,2], which is an absence of photon detection probability amplitude in a weak coherent beam background. It may be seen as the negative image of single photons, and it bears similarity to the concept of electron holes.
© 2009 IEEE
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