Memory coherence of a sympathetically cooled trapped-ion qubit

被引：41

作者：

Home, J. P. ^{[1
]}

McDonnell, M. J. ^{[1
]}

Szwer, D. J. ^{[1
]}

Keitch, B. C. ^{[1
]}

Lucas, D. M. ^{[1
]}

Stacey, D. N. ^{[1
]}

Steane, A. M. ^{[1
]}

机构：

[1] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

来源：

PHYSICAL REVIEW A | 2009年 / 79卷 / 05期

基金：

英国工程与自然科学研究理事会;

关键词：

fault tolerance; ground states; quantum gates; trapped ions; DETERMINISTIC QUANTUM TELEPORTATION; GROUND-STATE;

D O I：

10.1103/PhysRevA.79.050305

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We demonstrate sympathetic cooling of a Ca-43(+) trapped-ion "memory" qubit by a Ca-40(+) "coolant" ion sufficiently near the ground state of motion for fault-tolerant quantum logic, while maintaining coherence of the qubit. This is an essential ingredient in trapped-ion quantum computers. The isotope shifts are sufficient to suppress decoherence and phase shifts of the memory qubit due to the cooling light which illuminates both ions. We measure the qubit coherence during ten cycles of sideband cooling, finding a coherence loss of 3.3% per cooling cycle. The natural limit of the method is O(10(-4)) infidelity per cooling cycle.

引用

页数：4

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