Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single-Photon Transistor Using a F\"orster Resonance   An all-optical transistor is a device in which a gate light pulse switches
the transmission of a target light pulse with a gain above unity. The gain
quantifies the change of the transmitted target photon number per incoming gate
photon. We study the quantum limit of one incoming gate photon and observe a
gain of 20. The gate pulse is stored as a Rydberg excitation in an ultracold
gas. The transmission of the subsequent target pulse is suppressed by Rydberg
blockade which is enhanced by a F\"orster resonance. The detected target
photons reveal in a single shot with a fidelity above 0.86 whether a Rydberg
excitation was created during the gate pulse. The gain offers the possibility
to distribute the transistor output to the inputs of many transistors, thus
making complex computational tasks possible.

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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: math
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The categories of this paper are: cond-mat
3
The categories of this paper are: physics
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The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: dg-ga