Q:

Can someone donate antibodies?

Consider the following scenario:

Person A has been infected with some virus (for example, SARS-CoV-2)
Person A has recovered

From this scenario, I assume Person A has managed to develop antibodies for SARS-CoV-2. If so:

For how long, after recovery, would Person A have antibodies for the virus running in their blood?
If Person A donates blood to Person B, would Person B have better responses against the virus, by using  the antibodies received along the blood from Person A? (assuming the donation is successful without issues)
Is there any paper / study building upon this idea for combating SARS-CoV-2?

Notes:

I am not expecting exact quantitative answers to these questions. I just want basic understanding for reasons this could or could not work.

A:

Question 1

[...] antibodies [...] can last anywhere between a few weeks to a few months. The antibodies themselves though (which are proteins) definitely don't last forever (like all proteins). Eventually certain suppressor cells kill off plasma cells after the response has taken its course, and all that remains are a few memory cells, which are reactivated again should the pathogen invade the body in the future.

Source
Question 2 and 3
Yes.

Here is an article from Johns Hopkins University.
Here is a paper by Arturo Casadevall and Liise-anne Pirofski mentioned in the above article and published on the Journal of Clinical Investigation on March 13, 2020.

Fun fact: I was about to say in the question that I tried to research but didn't find anything. But I decided to make a last attempt, and actually found the answers...

