Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nano-electronic Realizations of Quantum Bits   Quantum computers could perform certain tasks which no classical computer can
perform in acceptable times. Josephson junction circuits can serve as building
blocks of quantum computers. We discuss and compare two designs, which employ
charge or magnetic flux degrees of freedom to process quantum information. In
both cases, elementary single-qubit and two-qubit logic gates can be performed
by voltage or flux pulses. The coherence time is long enough to allow a series
of such operations. We also discuss the read-out, i.e., a quantum measurement
process. In the charge case it is accomplished by coupling a single-electron
transistor to the qubit.

33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci