Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum-limited charge detection with two quantum point contacts   We present a scheme for tuning two quantum point contacts as a
quantum-limited charge detector. Based on the scattering matrix approach, we
analyze a general condition of quantum-limited detection with a single-channel
quantum detector possessing time-reversal symmetry. From this analysis we find
that quantum-limited detection can be easily realized with two quantum point
contacts connected in series, which is not possible if only a single quantum
point contact is used. We also discuss the sensitivity enhancement due to
multiple reflections of the two point contacts.

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The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
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The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: eess
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph