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High-fidelity preparation, gates, memory and readout of a trapped-ion quantum bit

zqyin 添加于 2014-3-7 10:36 | 2267 次阅读 | 0 个评论

作者
Harty TP, Allcock DTC, Ballance CJ, Guidoni L, Janacek HA, Linke NM, Stacey DN, Lucas DM
摘要
The great potential of quantum computing requires two essential ingredients for its realization: high-fidelity quantum logic operations and a physical implementation which can be scaled up to large numbers of quantum bits. We introduce a trapped-ion qubit stored in ultrastable \"atomic clock\" states of $^{43}$Ca$^+$, in which we implement all single-qubit operations with fidelities sufficient for fault-tolerant quantum computing. We measure a combined qubit state preparation and single-shot readout fidelity of 99.93%, a memory coherence time of T$_2^*$ = 50 seconds, and an average single-qubit gate fidelity of 99.9999%. These results are achieved in a room-temperature device without the use of magnetic field shielding or dynamic decoupling techniques to overcome technical noise. The surface-electrode ion trap chip incorporates integrated resonators and waveguides for coherent manipulation of the qubit using near-field microwaves. Two-qubit gates and individual qubit addressing have already been demonstrated using this approach, which is scalable for a many-qubit architecture.
详细资料
- 关键词: quant-ph
- 文献种类:手稿
- 期卷页: 2014年
- 日期: 2014-3-7
- 发布方式: arXiv e-prints
- 备注:arXiv:1403.1524v1; 4 figures, 5 pages, 6 nines
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表面离子阱实验，高保真度（0.999），高相干时间（50秒）