Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spontaneous Magnetic Flux and Quantum Noise in a Doubly Connected
  Mesoscopic SND Junction   We consider spontaneous magnetic flux in a doubly connected s-wave/normal
metal/ d-wave superconductor (SND) Josephson junction. The flux magnitude is
not quantized and is determined by the parameters of the system. In an isolated
system, quantum fluctuations of the superconducting phase take place, leading
to quantum flux noise. The possibilities of experimental observation of the
effect are discussed.

37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int