# Is biblatex compatible with RevTeX?

biblatex seems to be not compatible with RevTeX. As RevTeX automatically loads natbib, I load biblatex with the option natbib=true, but still LaTeX compiler complains that lot of commands are already defined. I make them undefined as follows:

\let\bibhang=\undefined
\let\citename=\undefined
\let\textcite=\undefined
\let\bibfont=\undefined
\let\Citeauthor=\undefined
\let\citet=\undefined
\let\citep=\undefined
\let\citealt=\undefined
\let\citealp=\undefined
\let\Citet=\undefined
\let\Citep=\undefined
\let\Citealt=\undefined
\let\Citealp=\undefined
\let\citefullauthor=\undefined
\let\citetext=\undefined
\let\defcitealias=\undefined

but still obtain various errors such as

! Package biblatex Error: Incompatible package 'natbib'.

See the biblatex package documentation for explanation.
Type  H <return>  for immediate help.
...

l.78 \begin{document}

?


I've checked that natbib compatibility mode is switched on:

Package biblatex Info: Trying to load natbib compatibility...
Package biblatex Info: ... file 'blx-natbib.def' found.
("C:\Program Files (x86)\MiKTeX 2.9\tex\latex\biblatex\blx-natbib.def"
File: blx-natbib.def 2011/02/13 v1.2a biblatex natbib compatibility


So, it looks as if that trouble comes from RevTeX. I tried both RevTeX4 and more recent RevTeX4-1. No difference.

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The biblatex manual states that natbib is incompatible with biblatex. The natbib option is unrelated to the package (it emulates it, but doesn't make it compatible). –  Philipp Feb 25 '11 at 17:21
Since you have a response below that seems to answer your question, please consider marking it as ‘Accepted’ by clicking on the tickmark below its vote count. This shows which answer helped you most if there's more than one answer, and it assigns reputation points to the author of the answer (and to you!). –  lockstep Feb 27 '11 at 16:16
Does anyone have any ideas on how difficult implementing a fork of RevTeX 4.1 that would be compatible with biblatex would be? I'd be prepared to put a bounty on it. As Igor mentions in the comment in the answer by Lockstep, this class dominates physics. –  qubyte Nov 24 '11 at 4:13

Since biblatex "reimplements the bibliographic facilities of LaTeX from the ground up, [it] naturally conflicts with all packages modifying the same facilities" (manual, section 1.5.4). Specifically, biblatex is incompatible with natbib. biblatex' natbib option only provides aliases for natbib's citation commands.
From a look into the manual of RevTeX 4.1, natbib is a required package, and multiple custom options and commands are defined on top of natbib. So no, I'm afraid biblatex is incompatible with RevTeX.