Year: 2023
Type: article
Abstract: Entanglement-based quantum networks require quantum photonic interfaces between stationary quantum memories and photons, enabling entanglement distribution. Here we present such a photonic interface, designed for connecting a40Ca+single-ion quantum memory to the telecom C-band. The interface combines a memory-resonant, cavity-enhanced spontaneous parametric down-conversion photon pair source with bi-directional polarization-conserving quantum frequency conversion. We demonstrate preservation of high-fidelity entanglement during conversion, fiber transmission over up to 40 km and back-conversion to the memory wavelength. Even for the longest distance and bi-directional conversion the entanglement fidelity remains larger than 95% (98%) without (with) background correction.
Source: npj Quantum Information
Institution: Saarland University
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,965
Awards: G3799097956, G4946157366, Verbundprojekt: QR.X - Quantenrepeater.Link - QR.X -, Teilvorhaben: Komponenten für QR-Strecken zwischen hybriden Quantensystemen und Implementierung auf einer Faserteststrecke, Verbundprojekt: Q.Link.Extension - Q.Link.X -, Teilvorhaben: Schnittstellen zwischen materiellen und photonischen Quantenbits
OpenAlex ID: W4363677155