Quantum state and process tomography via adaptive measurements
文献类型：期刊论文
| 作者 | Wang, HY ; Zheng, WQ ; Yu, NK ; Li, KR ; Lu, DW ; Xin, T ; Li, C ; Ji, ZF ; Kribs, D ; Zeng, B ; Peng, XH ; Du, JF |
| 刊名 | SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
 |
| 出版日期 | 2016 |
| 卷号 | 59期号:10 |
| 关键词 | quantum tomography state reconstruction nuclear magnetic resonance |
| ISSN号 | 1674-7348 |
| 中文摘要 | We investigate quantum state tomography (QST) for pure states and quantum process tomography (QPT) for unitary channels via adaptive measurements. For a quantum system with a d-dimensional Hilbert space, we first propose an adaptive protocol where only 2d - 1 measurement outcomes are used to accomplish the QST for all pure states. This idea is then extended to study QPT for unitary channels, where an adaptive unitary process tomography (AUPT) protocol of d(2)+d-1 measurement outcomes is constructed for any unitary channel. We experimentally implement the AUPT protocol in a 2-qubit nuclear magnetic resonance system. We examine the performance of the AUPT protocol when applied to Hadamard gate, T gate (pi/8 phase gate), and controlled-NOT gate, respectively, as these gates form the universal gate set for quantum information processing purpose. As a comparison, standard QPT is also implemented for each gate. Our experimental results show that the AUPT protocol that reconstructing unitary channels via adaptive measurements significantly reduce the number of experiments required by standard QPT without considerable loss of fidelity. |
| 英文摘要 | We investigate quantum state tomography (QST) for pure states and quantum process tomography (QPT) for unitary channels via adaptive measurements. For a quantum system with a d-dimensional Hilbert space, we first propose an adaptive protocol where only 2d - 1 measurement outcomes are used to accomplish the QST for all pure states. This idea is then extended to study QPT for unitary channels, where an adaptive unitary process tomography (AUPT) protocol of d(2)+d-1 measurement outcomes is constructed for any unitary channel. We experimentally implement the AUPT protocol in a 2-qubit nuclear magnetic resonance system. We examine the performance of the AUPT protocol when applied to Hadamard gate, T gate (pi/8 phase gate), and controlled-NOT gate, respectively, as these gates form the universal gate set for quantum information processing purpose. As a comparison, standard QPT is also implemented for each gate. Our experimental results show that the AUPT protocol that reconstructing unitary channels via adaptive measurements significantly reduce the number of experiments required by standard QPT without considerable loss of fidelity. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000382363000003 |
| 公开日期 | 2016-12-09 |
| 源URL | [http://ir.iscas.ac.cn/handle/311060/17299]  |
| 专题 | 软件研究所_软件所图书馆_期刊论文 |
| 推荐引用方式 GB/T 7714 | Wang, HY,Zheng, WQ,Yu, NK,et al. Quantum state and process tomography via adaptive measurements[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2016,59(10). |
| APA | Wang, HY.,Zheng, WQ.,Yu, NK.,Li, KR.,Lu, DW.,...&Du, JF.(2016).Quantum state and process tomography via adaptive measurements.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,59(10). |
| MLA | Wang, HY,et al."Quantum state and process tomography via adaptive measurements".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 59.10(2016). |
入库方式： OAI收割
来源：软件研究所
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