Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct Estimation of Single- and Two-Qubit Hamiltonians and Relaxation
  Rates   We provide a novel approach for characterization of quantum Hamiltonian
systems via utilizing a single measurement device. Specifically, we demonstrate
how external quantum correlations can be used for Hamiltonian identification
tasks. We explicitly introduce experimental procedures for direct estimation of
single- and two-qubit Hamiltonian parameters, and also for simultaneous
estimation of transverse and longitudinal relaxation rates, using a single
Bell-state analyzer. An advantage of our method over the earlier approaches is
that it has a built-in feature which makes it suitable for partial
characterization of Hamiltonian parameters.

5
The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
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The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: cs
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The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
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The categories of this paper are: physics
34
The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an