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4 March 2019 On-chip optical quantum memory at telecom wavelengths (Conference Presentation)
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Optical quantum memories will enable technologies including long distance quantum communication and modular quantum computing. Rare earth ion doped crystals provide an excellent solid state platform for optical quantum memories. Among rare earths, erbium is particularly appealing due to its long-lived telecom-wavelength resonance, allowing integration with silicon photonics and with existing optical communication technology and infrastructure. We present an on-chip all-optical quantum memory at telecom wavelengths using a nanobeam photonic crystal cavity fabricated directly in erbium-167 doped yttrium orthosilicate. Using an atomic frequency comb protocol, we store coherent pulses for memory times as long as 10 µs, albeit with low efficiency. For shorter memory times, we achieve a memory efficiency of 0.4%, which is limited by the coupling rate between the resonator and the ensemble of ions. By working at dilution refrigerator temperatures, we are able to access a regime where the ions have long optical coherence times and good spectral holeburning properties using only a moderate magnetic field applied with permanent magnets. We characterize the multimode properties and fidelity of the quantum memory in this device, and outline a path toward higher efficiency.
Conference Presentation
© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ioana Craiciu, Jake Rochman, Mi Lei, Evan Miyazono, Jonathan M. Kindem, John Bartholomew, Tian Zhong, and Andrei Faraon "On-chip optical quantum memory at telecom wavelengths (Conference Presentation)", Proc. SPIE 10933, Advances in Photonics of Quantum Computing, Memory, and Communication XII, 109330Q (4 March 2019); https://doi.org/10.1117/12.2510217
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