Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unambiguous quantum state elimination for qubit sequences   Quantum state elimination measurements tell us what states a quantum system
does not have. This is different from state discrimination, where one tries to
determine what the state of a quantum system is, rather than what it is not.
Apart from being of fundamental interest, quantum state elimination may find
uses in quantum communication and quantum cryptography. We consider unambiguous
quantum state elimination for two or more qubits, where each qubit can be in
one of two possible states. Optimal measurements for eliminating one and two
states out of four two-qubit states are given. We also prove that if we want to
maximise the average number of eliminated overall N-qubit states, then
individual measurements on each qubit are optimal.

19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph