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# Quantum storage of entangled photons at telecom wavelengths in a crystal

...+7
Dec 2022

The quantum internet -- in synergy with the internet that we use today --promises an enabling platform for next-generation information processing,including exponentially speed-up distributed computation, secure communication,and high-precision metrology. The key ingredients for realizing such a globalnetwork are the distribution and storage of quantum entanglement. As quantumnetworks are likely to be based on existing fibre networks, telecom-wavelengthentangled photons and corresponding quantum memories are of central interest.Recently, ${\rm ^{167}Er^{3+}}$ ions have been identified as a promisingcandidate for an efficient, broadband quantum memory at telecom wavelength.However, to date, no storage of entangled photons, the crucial step of quantummemory using these ions, has been reported. Here, we demonstrate the storageand recall of the entangled state of two telecom photons generated from anintegrated photonic chip based on silicon nitride. Combining the natural narrowlinewidth of the entangled photons and long storage time of ${\rm^{167}Er^{3+}}$ ions, we achieve storage time of 400 ns, more than one order ofmagnitude longer than in previous works. Successful storage of entanglement inthe crystal is certified by a violation of an entanglement witness by more than12 standard deviations (-0.161 $\pm$ 0.012) at 400 ns storage time. Theseresults pave the way for realizing quantum networks based on solid-statedevices.

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