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Acta Physica Sinica

Quantum memory and manipulation based on erbium doped crystals

北京理工大学物理学院,

Published Jan 1, 2021• 0 citations
Publisher

Abstract

量子信息技术是二十世纪极具代表性的两种科技进步——量子力学和信息科学技术相结合的新兴领域，其发展需要解决量子信号的产生、处理、传输、同步和存储等一系列问题，对材料的特性提出了严苛的要求，目前还没有一种材料可以在所有功能上都能满足量子信息应用的需要。掺铒晶体材料在1.5 微米 具有光学辐射峰，并且具有良好的相干特性，在量子信息技术的若干关键节点都有着巨大的应用前景。本文结合掺铒晶体的性质，回顾其在量子存储、量子频率转换、量子光源、以及基于离子间相互作用的量子调控等方面的应用进展，并对可能的发展方向进行讨论。

DOI
10.7498/aps.70.20211803

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量子信息技术是二十世纪极具代表性的两种科技进步——量子力学和信息科学技术相结合的新兴领域，其发展需要解决量子信号的产生、处理、传输、同步和存储等一系列问题，对材料的特性提出了严苛的要求，目前还没有一种材料可以在所有功能上都能满足量子信息应用的需要。掺铒晶体材料在1.5 微米 具有光学辐射峰，并且具有良好的相干特性，在量子信息技术的若干关键节点都有着巨大的应用前景。本文结合掺铒晶体的性质，回顾其在量子存储、量子频率转换、量子光源、以及基于离子间相互作用的量子调控等方面的应用进展，并对可能的发展方向进行讨论。
Quantum information is a rapidly emerging field aiming at combining two of the greatest advances in science and technology of the twentieth century, that is, quantum mechanics and information science. To reliably generate, store, process, and transmit quantum information, diverse systems have been studied. While for specific tasks some of these systems are more suitable than others, no single system can meet all envisioned demands. Erbium doped crystal has optical transition at 1.5 μm and possesses long optical coherence time and spin coherence time, and thus is one of the best candidates in building several essential blocks for quantum information applications. In this review, we summarize the applications of erbium doped crystals in quantum memories, quantum transducers, quantum sources, and quantum manipulations based on erbium-erbium interactions. Finally, the outlooks for near term prospects of the mentioned topics are also given.
Erbium (Er) is a rare-earth element that is expected to be a platform for manipulation of quantum information by utilizing telecommunication-wavelength photons.However, high-quality epitaxial growth of Er-doped host crystals is difficult, and the memory time of quantum information, which determines the performance of quantum manipulation, is much shorter than theoretically predicted.We investigated a good-compatibility rare-earth oxide as a host crystal for Er.The host oxide crystal, cerium oxide (CeO 2 ), had its nuclear spin removed (i.e., magnetically purified).The nuclear spin is the main factor that shortens the lifetime of quantum-information retention time.In this article, we describe high-quality epitaxial growth of CeO 2 and its optical properties as a thin film grown on a silicon substrate.