Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Near-Perfect Simultaneous Measurement of a Qubit Register   Simultaneous measurement of multiple qubits stored in hyperfine levels of
trapped 111Cd+ ions is realized with an intensified charge-coupled device (CCD)
imager. A general theory of fluorescence detection for hyperfine qubits is
presented and applied to experimental data. The use of an imager for photon
detection allows for multiple qubit state measurement with detection fidelities
of greater than 98%. Improvements in readout speed and fidelity are discussed
in the context of scalable quantum computation architectures.

15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th