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Quantum memory is a crucial element in large-scale quantum networks. Integrated quantum memories based on micro-/-nano structures, such as waveguides, could significantly enhance the scalability and reduce the consumption of optical and electrical power. 151Eu3+:Y2SiO5 stands out as an exceptional candidate material for quantum memory, because it possesses a spin coherence lifetime of 6 hours and an optical storage lifetime of 1 hour. Here we employ focused ion beam technology to fabricate a triangular nanobeam on the surface of a Y2SiO5 crystal. The width and length of the nanobeam are 2 μm and 20 μm, respectively. The optical lifetime and inhomogeneous broadening of 151Eu3+ in the triangular nanobeam are measured by fluorescence spectroscopy. The optical lifetime is 1.9 ±0.1 ms and the optical inhomogeneous broadening is 1.58 ±0.05 GHz at a doping level of 0.07% for 151Eu3+. The hyperfine transition spectra are measured using optically detected magnetic resonance and a spin inhomogeneous broadening of 19 ±3 kHz is obtained. Furthermore, we analyze the coherence property of optical and hyperfine transitions separately via transient spectral hole burning and spin echo measurement. We obtain a optical homogeneous linewidth down to 22 ±3 kHz which is still limited by the instantaneous spectral diffusion and a spin coherence lifetime of 5.1 ±0.6 ms at the geomagnetic field. The results demonstrate that 151Eu3+ embedded within the 2 μm triangular nanobeam essentially retain the same optical and hyperfine transition properties as those observed in bulk crystals. Consequently, this research establishes a foundation for integrated quantum memories based on 151Eu3+ ensembles and the detection of the single 151Eu3+ ion based on the focused ion beam technique.
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Keywords:
- rare-earth-doped crystal /
- quantum memory /
- focused ion beam /
- quantum information
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