Detrimental effects of quantum noise on amplification of nonclassical and entangled states

I will examine the effects of quantum noise on amplification and entanglement of quantum states. This investigation is of importance because many quantum communication protocols may use both attenuators and amplifiers. I will present quantitative results on the survival of entanglement and nonclassicality as a result of various types of quantum noise, considering both phase sensitive and insensitive amplifiers. It turns out that the quantum character of the field is much more sensitive to the amplifier noise.