I can't think of anything else that the teleportation tag would be used for, at least not within the scope of actual physics (and hence of this site). Unless there is some such thing, yes, I'd say go for it.
Of course there do seem to be some existing questions with the teleportation tag which quantum-teleportation would not apply to. Most of them are ...
1) If one has enough reputation points, it is possible to directly propose tag synonyms. (Note in particular, that reputation points in the corresponding master tag are needed.) In OP's concrete example, one should go e.g. here or here.
2) Alternatively, if one doesn't have enough reputation points, there is a meta post called Tag synonyms for voting. There ...
For the time being for pragmatic reasons. Phys.SE used to have a quantum-computing and a quantum-computation tag, which were often misused by some users whenever they had to compute something in quantum mechanics. This practice stopped once they were redirected to the quantum-computer tag.
The weak-force tag and the weak-interactions tag were merged into the weak-interaction tag in 2014, partly spurred by this 2013 meta post.
General tip: Other synonym tags can be suggested on this meta page.
are there too many and/or specific tags?
Generally, no, I don't think so.
To take this specific example, it doesn't matter whether anyone works on wavefunctions. That's not the criterion for what makes a proper tag. It's entirely plausible that someone might want to look through the questions we have about wavefunctions.
Contrary to merging of tags, the creation of synonyms does not alter posts retroactively. If a question is edited after the synonym was created, the tags of the question will conform with the new synonym rules.
In the future just raise such non-controversial merge requests1 in chat (as opposed to meta), and a moderator will take action.
Note that synonyms are reversible while merges are irreversible (=hard to unshuffle). This is why we often hesitate to perform merges.
1 I changed OP's original wording burninate request into merge request, ...
classical-electrodynamics → electromagnetism
We currently have three tags (and many others):
In my opinion, classical-electrodynamics should be a synonym to electromagnetism, covering everything that is governed by the classical Maxwell equations, such as the Lorentz force, magnets and ...
I tend to agree with @Qmechanic here: if there is any need for discussion, lumping all these tags into one post becomes unwieldy. I'm sure not gonna burn a big pile of tags like this.
I also agree with David Z here - if a tag describes part of the topic of a question, then it's a good tag. There aren't too many; you're not gonna run out. This notion that ...
I) Specifically about covariance:
1) The covariance tag is supposed to cover whatever-notion-the-physical-system-in-the-question-is-covariant-under, typically relativistic covariance, but also more abstractly, e.g., contravariant and covariant tensors not necessarily in the context of relativity.
All other uses of the covariance tag than the above are ...
You've got the requirements wrong, they're slightly stricter. Firstly, 2.5k rep is needed for voting, too. In addition, it's a score (upvotes-downvotes) of five from answers.
As a result we usually (depends on the tag) don't have the requisite number of people to get synonyms by community voting.
The syn page isn't too visible and there's not much of a ...
graphene is a pretty big field in solid state physics. It has applications in the implementation of quantum computation.
air probably isn't necessary and can be merged with one of the fluid tags
earthquake merge with geophysics?
nebulae this isn't really a specific object as nebulae are quite a vast topic in astrophysics. If this tag were to ...
This can be done with the mod synonymification tool - no need to go through the whole process of proposing a suggestion when it's such an obvious correspondence.
I'll leave this for a day or so just in case anyone does have comments, and then make the changes.
mmm, synonymification :-)
if the Phys.SE community thinks a frw-universe tag would be useful, and
if somebody would like to be custodian over the frw-universe tag, then it seems like a good idea to undo the synonym.
In an ideal world you are right: Let's tag all the questions as precise as possible. The problem is that we are only allowed to use 5 tags. And many users would ...
The particle-physics tag (currently with approx. 3500 questions) is one of a few primary tags. Ideally all questions should be tagged with a primary tag.
The elementary-particles tag (currently with approx. 200 questions) is a secondary tag. It is mainly used for particle physics questions where it is important to distinguish between elementary particles and ...