Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum-efficient charge detection using a single-electron transistor   We evaluate the detector nonideality (and energy sensitivity) of a
normal-state single-electron transistor (SET) in the cotunneling regime in a
two-charge-state approximation. For small conductances and at zero temperature,
the SET's performance as a charge-qubit readout device is characterized by a
universal one-parameter function. The result shows that near-ideal,
quantum-limited measurement is possible for a wide range of small bias
voltages. However, near the threshold voltage for crossover to sequential
tunneling, the device becomes strongly nonideal. The (symmetrized)
current-charge cross-correlation vanishes for low frequencies, causing two
different definitions of detector nonideality to agree. Interpretations of
these findings are discussed.

11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs