Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum weak values are not unique; what do they actually measure?   Precise definitions of "weak [quantum] measurements" and "weak value" [of a
quantum observable] are offered, which seem to capture the meaning of the often
vague ways that these terms are used in the literature. Simple finite
dimensional examples are given showing that weak values of an observable are
not unique, and in fact arbitrary weak values can be obtained by appropriate
weak measurements. This implies that a "weak value" of an observable A, *by
itself*, can furnish no unambiguous information about A; any information in a
weak value is inextricably connected with the particular measurement procedure
used to obtain that weak value. Moreover, arbitrary weak values can be obtained
using a "meter space" of dimension as small as 2.
  A "Remarks" section questions the utility of "weak measurement".

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The categories of this paper are: eess
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-ex
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The categories of this paper are: stat
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The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
2
The categories of this paper are: math