Deterministic entanglement and tomography of ion-spin qubits

被引：64

作者：

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

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

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

Imreh, G. ^{[1
]}

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

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

Thomas, N. R. ^{[1
]}

Webster, S. C. ^{[1
]}

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

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

机构：

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

来源：

NEW JOURNAL OF PHYSICS | 2006年 / 8卷

关键词：

D O I：

10.1088/1367-2630/8/9/188

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have implemented a universal quantum logic gate between qubits stored in the spin state of a pair of trapped Ca-40 ions. An initial product state was driven to a maximally entangled state deterministically, with 83% fidelity. We present a general approach to quantum state tomography which achieves good robustness to experimental noise and drift, and use it to measure the spin state of the ions. We find the entanglement of formation is 0.54.

引用

页数：8

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