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- W3171609414 abstract "Entanglement between photons at telecommunication wavelengths and long-lived quantum memories is one of the fundamental requirements of long-distance quantum communication. Quantum memories featuring on-demand read-out and multimode operation are additional precious assets that will benefit the communication rate. In this work we report the first demonstration of entanglement between a telecom photon and a collective spin excitation in a multimode solid-state quantum memory. Photon pairs are generated through widely non-degenerate parametric down-conversion, featuring energy-time entanglement between the telecom-wavelength idler and a visible signal photon. The latter is stored in a Pr$^{3+}$:Y$_2$SiO$_5$ crystal as a spin wave using the full Atomic Frequency Comb scheme. We then recall the stored signal photon and analyze the entanglement using the Franson scheme. We measure conditional fidelities of $92(2)%$ for excited-state storage, enough to violate a CHSH inequality, and $77(2)%$ for spin-wave storage. Taking advantage of the on-demand read-out from the spin state, we extend the entanglement storage in the quantum memory for up to 47.7~$mu$s, which could allow for the distribution of entanglement between quantum nodes separated by distances of up to 10 km." @default.
- W3171609414 created "2021-06-22" @default.
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- W3171609414 date "2021-06-09" @default.
- W3171609414 modified "2023-10-06" @default.
- W3171609414 title "Entanglement between a telecom photon and an on-demand multimode solid-state quantum memory" @default.
- W3171609414 hasPublicationYear "2021" @default.
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