Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Entangling Color-Different Photons via Time-Resolved Measurement and
  Active Feed-Forward   Entangling independent photons is not only of fundamental interest but also
of crucial importance for quantum information science. Two-photon interference
is a major method to entangle independent identical photons. If two photons are
color-different, perfect two-photon coalescence cannot happen anymore, which
makes the entangling of color-different photons difficult to realize. In this
letter by exploring and developing time-resolved measurement and active
feed-forward, we have entangled two independent photons of different colors for
the first time. We find that entanglement with a varying form can be identified
for different two-photon temporal modes through time-resolved measurement. By
using active feed-forward we are able to convert the varying entanglement into
uniform. Adopting these measures, we have successfully entangled two photons
with a frequency separation of 16 times larger than their linewidths. In
addition to its fundamental interest, our work also provides an approach to
solve the frequency mismatch problem for future quantum networks.

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The categories of this paper are: cs
5
The categories of this paper are: gr-qc
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The categories of this paper are: math
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
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The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
18
The categories of this paper are: econ
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The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci