Process tomography of ion trap quantum gates

被引：157

作者：

Riebe, M.

Kim, K.

Schindler, P.

Monz, T.

Schmidt, P. O.

Koerber, T. K.

Haensel, W.

Haeffner, H.

Roos, C. F.

Blatt, R.

机构：

[1] Univ Innsbruck, Inst Expt Phys, A-6020 Innsbruck, Austria

[2] Austrian Acad Sci, Inst Quantenopt & Quanteninformat, A-6020 Innsbruck, Austria

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.97.220407

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A crucial building block for quantum information processing with trapped ions is a controlled-NOT quantum gate. In this Letter, two different sequences of laser pulses implementing such a gate operation are analyzed using quantum process tomography. Fidelities of up to 92.6(6)% are achieved for single-gate operations and up to 83.4(8)% for two concatenated gate operations. By process tomography we assess the performance of the gates for different experimental realizations and demonstrate the advantage of amplitude-shaped laser pulses over simple square pulses. We also investigate whether the performance of concatenated gates can be inferred from the analysis of the single gates.

引用

页数：4

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