Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dual-rail optical gradient echo memory   We introduce a scheme for the parallel storage of frequency separated signals
in an optical memory and demonstrate that this dual-rail storage is a suitable
memory for high fidelity frequency qubits. The two signals are stored
simultaneously in the Zeeman-split Raman absorption lines of a cold atom
ensemble using gradient echo memory techniques. Analysis of the split-Zeeman
storage shows that the memory can be configured to preserve the relative
amplitude and phase of the frequency separated signals. In an experimental
demonstration dual-frequency pulses are recalled with 35% efficiency, 82%
interference fringe visibility, and 6 degrees phase stability. The fidelity of
the frequency-qubit memory is limited by frequency-dependent polarisation
rotation and ambient magnetic field fluctuations, our analysis describes how
these can be addressed in an alternative configuration.

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The categories of this paper are: astro-ph
1
The categories of this paper are: cs
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
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The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph