Noise of a quantum amplifier

Quantum noise becomes important when considering the amplification of a small signal. Roughly, the quantum uncertainty of the quadrature components of the field is amplified as well as the signal; the resulting uncertainty appears as noise.

In physics, quantum noise refers to the uncertainty of a physical quantity. In certain

situations, quantum noise appears as shot noise; for example, most optical

communications use amplitude modulation, and thus, the quantum noise appears as

shot noise only.

For my first two posts in years I opted for the whimsical, in hope of deliverance from

oblivion. Thank you in advance for your comments.

Great Carlos...welcome back! It is great to see your work again! :) Best to you!

:---]] !

Tatjana, Drew, thank you for stopping by and taking a look at my photo. It's really appreciated, but most of all, I'm really glad you're still around. It's so good to be back and find all friends again. cheers!