Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Protected Josephson Rhombi Chains   We have studied the low-energy excitations in a minimalistic protected
Josephson circuit which contains two basic elements (rhombi) characterized by
the $\pi$ periodicity of the Josephson energy. Novel design of these elements,
which reduces their sensitivity to the offset charge fluctuations, has been
employed. We have observed that the life time $T_{1}$ of the first excited
state of this quantum circuit in the protected regime is increased up to $70\mu
s$, a factor of $\sim100$ longer than that in the unprotected state. The
quality factor $\omega_{01}T_{1}$ of this qubit exceeds $10^{6}$ . Our results
are in agreement with theoretical expectations; they demonstrate the
feasibility of symmetry protection in the rhombi-based qubits fabricated with
existing technology.

12
The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an