Collect background/source research papers

[crazy4pi314]

Using this issue to track what papers we use/look at/consider for the implementations here so we can cite them later:

• https://arxiv.org/abs/1902.01329
• https://arxiv.org/abs/1812.00954
• https://arxiv.org/abs/2002.09340

[glassnotes]

Original qRAM proposals:

• https://arxiv.org/abs/0708.1879
• https://arxiv.org/pdf/0807.4994

[glassnotes]

Two papers about efficient state preparation (first one I know well and we should definitely implement, the second I have to read still):

• https://arxiv.org/abs/1812.00954
• https://arxiv.org/abs/2005.07711

[glassnotes]

There is a quite efficient qROM in III.C of this paper as well:
https://arxiv.org/abs/1805.03662

[glassnotes]

Note: https://arxiv.org/abs/2002.09340 has been updated to the journal version.