Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Qubit relaxation from evanescent-wave Johnson noise   In many quantum computer architectures, the qubits are in close proximity to
metallic device elements. Metals have a high density of photon modes, and the
fields spill out of the bulk metal because of the evanescent-wave component.
Thus thermal and quantum electromagnetic Johnson- type noise from metallic
device elements can decohere nearby qubits. In this paper we use quantum
electrodynamics to compute the strength of this evanescent-wave Johnson noise
as a function of distance z from a metallic half-space. Previous treatments
have shown unphysical divergences at z = 0. We remedy this by using a proper
non-local dielectric function. Decoherence rates of local qubits are
proportional to the magnitude of electric or magnetic correlation functions
evaluated at the qubit position. We present formulas for the decoherence rates.
These formulas serve as an important constraint on future device architectures.

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The categories of this paper are: gr-qc
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
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The categories of this paper are: math
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: supr-con
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: econ
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The categories of this paper are: hep-ex
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The categories of this paper are: alg-geom