On-demand storage of photonic qubits at telecom wavelengths

Abstract

Quantum memories at telecom wavelengths are crucial for the construction of large-scale quantum networks based on existing fiber networks. On-demand storage of telecom photonic qubits is a fundamental request for such networking applications but yet to be demonstrated. Here we demonstrate the storage and on-demand retrieval of telecom photonic qubits using a laser-written waveguide fabricated in an ${}^{167}$Er${}^{3+}$:Y${}_2$SiO${}_5$ crystal. Both ends of the waveguide memory are directly connected with fiber arrays with a fiber-to-fiber efficiency of 51%. Storage fidelity of 98.3(1)% can be obtained for time-bin qubits encoded with single-photon-level coherent pulses, which is far beyond the maximal fidelity that can be achieved with a classical measure and prepare strategy. This device features high reliability, easy scalability and can be directly integrated into fiber networks, which could play an essential role in fiber-based quantum networks.

13 pages, 10 figures

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Cited by in corpus (14)

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• Quantum storage of entangled photons at telecom wavelengths in a crystal
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• Time-delayed single satellite quantum repeater node for global quantum communications
• Erbium emitters in commercially fabricated nanophotonic silicon waveguides
• Stark tuning of telecom single-photon emitters based on a single Er${}^{3+}$
• Quantum Teleportation from Telecom Photons to Erbium-ion Ensembles
• A fiber-integrated quantum memory for telecom light
• Storage of telecom wavelength heralded single photons in a fiber cavity quantum memory
• Limits of single-photon storage in a single $\Lambda$-type atom
• Efficient integrated quantum memory for light
• Erbium Quantum Memory Platform with Long Optical Coherence via Back-End of Line Deposition on Foundry-Fabricated Photonics
• Telecom-Integrated Photonic Memory Operating Near the Mechanical Ground State
• Proposal for spin squeezing in rare-earth ion-doped crystals with a four-color scheme