Related papers: Kilometer-Scale Ion-Photon Entanglement with a Metastable $^{88}$Sr$^{+}$ Qubit

Kilometer-Scale Ion-Photon Entanglement with a Metastable $^{88}$Sr$^{+}$ Qubit

URL: http://arxiv.org/abs/2506.11257v1
Date: Thu, 12 Jun 2025 20:01:18 GMT
Title: Kilometer-Scale Ion-Photon Entanglement with a Metastable $^{88}$Sr$^{+}$ Qubit
Authors: Mika A. Zalewski, Denton Wu, Ana Luiza Ferrari, Yuanheng Xie, Norbert M. Linke,
Abstract summary: entanglement persists after transmitting the photon over a $2.8:$km long commercial fiber deployed in an urban environment.<n>Results establish the Strontium ion as a promising candidate for metropolitan-scale quantum networking based on an atomic transition at $1092:$nm.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We demonstrate entanglement between the polarization of an infrared photon and a metastable $^{88}$Sr$^+$ ion qubit. This entanglement persists after transmitting the photon over a $2.8\:$km long commercial fiber deployed in an urban environment. Tomography of the ion-photon entangled state yields a fidelity of $0.949(4)$ within the laboratory and $0.929(5)$ after fiber transmission, not corrected for readout errors. Our results establish the Strontium ion as a promising candidate for metropolitan-scale quantum networking based on an atomic transition at $1092\:$nm, a wavelength compatible with existing telecom fiber infrastructure.

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