Room-Temperature Quantum Bit Storage Exceeding 39 Minutes Using Ionized Donors in Silicon-28
Room-Temperature Quantum Bit Storage Exceeding 39 Minutes Using Ionized Donors in Silicon-28
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DOI：
10.1126/science.1239584
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发表时间：
2013-11-15
期刊：
影响因子：
56.9
通讯作者：
Thewalt, Mike L. W.
中科院分区：
文献类型：
--
作者：
Saeedi, Kamyar;Simmons, Stephanie;Thewalt, Mike L. W.
能够在室温下长时间存储和检索相干信息的量子存储器将使许多新技术成为可能。半导体中使用浅中性供体的电子和核自旋量子位已被广泛研究，但仅限于低温（小于或类似于10开尔文）；然而，电离给体的核自旋具有高温操作的潜力。我们使用光学方法和动态解耦来实现同位素纯化硅-28中磷-31供体系综的这种潜力，并观察到室温相干时间超过39分钟。我们进一步证明了相干自旋叠加可以从4.2开尔文循环到室温，并且我们报告了在同一系统中低温相干时间为3小时。
Quantum memories capable of storing and retrieving coherent information for extended times at room temperature would enable a host of new technologies. Electron and nuclear spin qubits using shallow neutral donors in semiconductors have been studied extensively but are limited to low temperatures (less than or similar to 10 kelvin); however, the nuclear spins of ionized donors have the potential for high-temperature operation. We used optical methods and dynamical decoupling to realize this potential for an ensemble of phosphorous-31 donors in isotopically purified silicon-28 and observed a room-temperature coherence time of over 39 minutes. We further showed that a coherent spin superposition can be cycled from 4.2 kelvin to room temperature and back, and we report a cryogenic coherence time of 3 hours in the same system.