Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Recovering noise-free quantum observables   We introduce a technique for recovering noise-free observables in noisy
quantum systems by combining the results of many slightly different
experiments. Our approach is applicable to a variety of quantum systems but we
illustrate it with applications to quantum computing and quantum sensing. The
approach corresponds to repeating the same quantum evolution many times with
known variations on the underlying systems' error properties, e.g. the
spontaneous emission and dephasing times, $T_1$ and $T_2$. As opposed to
standard quantum error correction methods, which have an overhead in the number
of qubits (many physical qubits must be added for each logical qubit) our
method has only an overhead in number of evaluations, allowing the overhead to,
in principle, be hidden via parallelization. We show that the effective
spontaneous emission, $T_1$, and dephasing, $T_2$, times can be increased using
this method in both simulation and experiments on an actual quantum computer.
We also show how to correct more complicated entangled states and how Ramsey
fringes relevant to quantum sensing can be significantly extended in time.

17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg