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Spin-photon entanglement of a single Er$^{3+}$ ion in the telecom band
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abstract
Long-distance quantum communication using quantum repeaters is an enabling technology for secure communication, distributed quantum computing and quantum-enhanced sensing and metrology. As a building block of quantum repeaters, spin-photon entanglement has been demonstrated with both atomic and solid-state qubits. However, previously demonstrated qubits with long spin coherence do not directly emit photons into the low-loss telecom band that is needed for long-distance communication. Here, we demonstrate spin-photon entanglement using a single Er$^{3+}$ ion in a solid-state crystal, integrated into a silicon nanophotonic circuit. Direct emission into the telecom band enables an entanglement rate of 1.48 Hz over 15.6 km of optical fiber, with a fidelity of 73(3)$\%$. This opens the door to large-scale quantum networks based on scalable nanophotonic devices and many spectrally multiplexed Er$^{3+}$ ions.
Forward citations
Cited by 4 Pith papers
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Efficient Storage of Multidimensional Telecom Photons in a Solid-State Quantum Memory
An interleaved optical pumping scheme boosts storage efficiency of a telecom-band erbium quantum memory by more than an order of magnitude, enabling polarization, frequency, and time-bin qubit storage at moderate fiel...
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Quantum Teleportation from Telecom Photons to Erbium-ion Ensembles
A time-bin qubit carried by a telecom photon was teleported into a 167Er3+:Y2SiO5 atomic-frequency-comb memory with state fidelity 0.818±0.019 and process fidelity 0.736±0.022.
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Spectroscopic Investigations of Multiple Environments in Er:CaWO4 through Charge Imbalance
Er:CaWO4 contains at least four distinct erbium environments; the authors fully assign their crystal-field levels, dipole selection rules, lifetimes, and branching ratios.
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Remote Quantum Networks based on Quantum Memories
A review of quantum-memory-based remote quantum network experiments, comparing platforms and distances, and arguing that memory-based quantum repeaters over hundreds of kilometers are within reach.
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