Efficient Storage of Multidimensional Telecom Photons in a Solid-State Quantum Memory

• URL: http://arxiv.org/abs/2412.05480v1
• Date: Sat, 07 Dec 2024 00:47:26 GMT
• Title: Efficient Storage of Multidimensional Telecom Photons in a Solid-State Quantum Memory
• Authors: Zongfeng Li, Yisheng Lei, Trevor Kling, Mahdi Hosseini,
• Abstract summary: Erbium ions in crystalline hosts provide a promising platform for telecom quantum memories. We demonstrate the storage of telecom photonic qubits encoded in polarization, frequency, and time-bin bases.
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• Abstract: Efficient storage of telecom-band quantum optical information represents a crucial milestone for establishing distributed quantum optical networks. Erbium ions in crystalline hosts provide a promising platform for telecom quantum memories; however, their practical applications have been hindered by demanding operational conditions, such as ultra-high magnetic fields and ultra-low temperatures. In this work, we demonstrate the storage of telecom photonic qubits encoded in polarization, frequency, and time-bin bases. Using the atomic frequency comb protocol in an Er$^{3+}$-doped crystal, we developed a memory initialization scheme that improves storage efficiency by over an order of magnitude under practical experimental conditions. Quantum process tomography further confirms the memory's performance, achieving a fidelity exceeding 92%.

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