Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Demonstration of quantum entanglement between a single electron spin
  confined to an InAs quantum dot and a photon   The electron spin state of a singly charged semiconductor quantum dot has
been shown to form a suitable single qubit for quantum computing architectures
with fast gate times. A key challenge in realizing a useful quantum dot quantum
computing architecture lies in demonstrating the ability to scale the system to
many qubits. In this letter, we report an all optical experimental
demonstration of quantum entanglement between a single electron spin confined
to single charged semiconductor quantum dot and the polarization state of a
photon spontaneously emitted from the quantum dot's excited state. We obtain a
lower bound on the fidelity of entanglement of 0.59, which is 84% of the
maximum achievable given the timing resolution of available single photon
detectors. In future applications, such as measurement based spin-spin
entanglement which does not require sub-nanosecond timing resolution, we
estimate that this system would enable near ideal performance. The inferred
(usable) entanglement generation rate is 3 x 10^3 s^-1. This spin-photon
entanglement is the first step to a scalable quantum dot quantum computing
architecture relying on photon (flying) qubits to mediate entanglement between
distant nodes of a quantum dot network.

24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ