China University of Science and Technology prepares integrated solid-state quantum memory
Academician Guo Guangcan's team at the University of Science and Technology of China has made important progress in the field of quantum storage. The team Li Chuanfeng, Zhou Zongquan and others used femtosecond laser micromachining technology to prepare a high-fidelity integrable solid-state quantum memory, and based on self-developed equipment for the first time to achieve a comprehensive increase in the life of rare earth ion electron spin and nuclear spin coherence. Related results were published in "Optics" and "Applied Physics Review" on February 20 and 28, respectively.
The current research on solid-state quantum memory faces two challenges. On the one hand, most of the storage media used in existing solid-state quantum storage experiments are bulk crystals. This material cannot be directly docked with fiber networks or integrated optical chips, making it difficult to achieve large-scale scalability. application. On the other hand, the electron spins and nuclear spins of rare earth ions interact with phonons in the crystal, resulting in severely limited coherent lifetime of quantum memory.
To solve the scalability problem, the research team used femtosecond laser micromachining technology to etch optical waveguides in europium-doped yttrium silicate crystals for the first time, and developed an integrated solid-state quantum memory. The experiment demonstrates two optical quantum storage schemes, atomic frequency comb (AFC) and low noise echo recovery (ROSE). The fidelity of the two schemes exceeds 99% and 97%, respectively. High reliability.
For the problem of limited coherent lifetime, an effective solution is to construct a deep low temperature (<0.5K) pulsed electron and nuclear spin dual resonance spectrometer (ENDOR), thereby reducing phonons and polarizing electron spin. The research team successfully built the world's first cryogenic pulsed electron and nuclear spin dual resonance spectrometer, and strictly calibrated its minimum operating temperature to 0.1K.
The reviewers believe that at 0.1K operating temperature, the coherent lifetimes of electron and nuclear spins have increased by more than an order of magnitude. This is the first time that a significant increase in spin coherence lifetime has been observed in rare earth ions at deep temperatures. (Apprentice reporter Yang Fan)
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