Transmission of light-matter entanglement over a metropolitan network
- URL: http://arxiv.org/abs/2304.05416v1
- Date: Tue, 11 Apr 2023 18:00:02 GMT
- Title: Transmission of light-matter entanglement over a metropolitan network
- Authors: Jelena V. Rakonjac and Samuele Grandi and S\"oren Wengerowsky and
Dario Lago-Rivera and F\'elicien Appas and Hugues de Riedmatten
- Abstract summary: We report on the transmission of telecom photons entangled with a multimode solid-state quantum memory over a deployed optical fiber in a metropolitan area.
We measured highly-non-classical correlations between the stored and the telecom photons for storage times up to 25 $mu$s and for a fibre separation up to 50 km.
We also report light-matter entanglement with a two-qubit fidelity up to 88$%$, which remains constant within error bars for all fibre lengths.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We report on the transmission of telecom photons entangled with a multimode
solid-state quantum memory over a deployed optical fiber in a metropolitan
area. Photon pairs were generated through spontaneous parametric
down-conversion, with one photon stored in a rare earth-based quantum memory,
and the other, at telecommunication wavelengths, traveling through increasing
distances of optical fibre, first in the laboratory and then outside in a
deployed fibre loop. We measured highly-non-classical correlations between the
stored and the telecom photons for storage times up to 25 $\mu$s and for a
fibre separation up to 50 km. We also report light-matter entanglement with a
two-qubit fidelity up to 88$\%$, which remains constant within error bars for
all fibre lengths, showing that the telecom qubit does not suffer decoherence
during the transmission. Finally, we moved the detection stage of the telecom
photons to a different location placed 17 km away, and confirmed the
non-classical correlations between the two photons. Our system was adapted to
provide the transmission of precise detection times and synchronization signals
over long quantum communication channels, providing the first steps for a
future quantum network involving quantum memories and non-classical states.
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