Quantum-dot cellular automata using buried dopants
Quantum-dot cellular automata using buried dopants
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DOI：
10.1103/physrevb.71.115302
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发表时间：
2004-07
影响因子：
3.7
通讯作者：
J. Cole;A. Greentree;C. Wellard;L. Hollenberg;S. Prawer
中科院分区：
文献类型：
--
作者：
J. Cole;A. Greentree;C. Wellard;L. Hollenberg;S. Prawer
研究了使用掩埋掺杂剂构建量子点元胞自动机作为信息传输和基本计算的传统电子设备的替代方案。这限制了此类系统的小型化，因为每个势阱均由单个掺杂剂原子形成。例如，硅中的磷供体被发现具有良好的能级分离，并且具有微秒量级的不相干切换时间。然而，我们还说明了通过绝热演化实现超快量子相干切换的可能性。通过数值计算发现单个电池的切换速度为数十皮秒或更短。退相干的影响也以移相过程的形式进行模拟，并估计有限移相操作的极限。讨论了该方案相对于更传统的基于量子点的方案的优点和局限性。还讨论了埋入式供体元胞自动机系统的使用，作为测试基于埋入式供体的量子计算方案的几个方面的架构。
The use of buried dopants to construct quantum-dot cellular automata is investigated as an alternative to conventional electronic devices for information transport and elementary computation. This provides a limit in terms of miniaturization for this type of system as each potential well is formed by a single dopant atom. As an example, phosphorous donors in silicon are found to have good energy level separation with incoherent switching times of the order of microseconds. However, we also illustrate the possibility of ultrafast quantum coherent switching via adiabatic evolution. The switching speeds are numerically calculated and found to be tens of picoseconds or less for a single cell. The effect of decoherence is also simulated in the form of a dephasing process and limits are estimated for operation with finite dephasing. The advantages and limitations of this scheme over the more conventional quantum-dot based scheme are discussed. The use of a buried donor cellular automata system is also discussed as an architecture for testing several aspects of buried donor based quantum computing schemes.