Telecom Quantum Photonic Interface for a $^{40}$Ca$^+$ Single-Ion Quantum Memory

• URL: http://arxiv.org/abs/2211.08841v1
• Date: Wed, 16 Nov 2022 11:42:32 GMT
• Title: Telecom Quantum Photonic Interface for a $^{40}$Ca$^+$ Single-Ion Quantum Memory
• Authors: Elena Arensk\"otter, Tobias Bauer, Stephan Kucera, Matthias Bock, J\"urgen Eschner, Christoph Becher
• Abstract summary: Entanglement-based quantum networks require quantum photonic interfaces between stationary quantum memories and photons. We present a photonic interface, designed for connecting a $40$Ca$+$ single-ion quantum memory to the telecom C-band.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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 a $^{40}$Ca$^+$ single-ion quantum memory to the telecom C-band. The interface combines a memory-resonant, cavity-enhanced spontaneous parametric down-conversion (SPDC) photon pair source with bi-directional polarization-conserving quantum frequency conversion (QFC). 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.

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