Spin-photon entanglement of a single Er$^{3+}$ ion in the telecom band

• URL: http://arxiv.org/abs/2406.06515v2
• Date: Tue, 11 Jun 2024 21:49:20 GMT
• Title: Spin-photon entanglement of a single Er$^{3+}$ ion in the telecom band
• Authors: Mehmet T. Uysal, Łukasz Dusanowski, Haitong Xu, Sebastian P. Horvath, Salim Ourari, Robert J. Cava, Nathalie P. de Leon, Jeff D. Thompson,
• Abstract summary: Long-distance quantum communication using quantum repeaters is an enabling technology for secure communication. As a building block of quantum repeaters, spin-photon entanglement has been demonstrated with both atomic and solid-state qubits. Here, we demonstrate spin-photon entanglement using a single Er$3+$ ion in a solid-state crystal, integrated into a silicon nanophotonic circuit.
• Score: 0.27376226833693
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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