Witnessing entanglement without entanglement witness operators
Witnessing entanglement without entanglement witness operators
复制标题
见证纠缠而无需纠缠见证操作员
DOI：
10.1073/pnas.1603346113
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发表时间：
2015-12
影响因子：
11.1
通讯作者：
Smerzi Augusto
中科院分区：
文献类型：
--
作者：
Pezze Luca;Li Yan;Li Weidong;Smerzi Augusto
多体系统纠缠的实验检测和理论表征是一个尚未解决的问题。在这里，我们将纠缠与统计速度联系起来，测量在任意多体哈密顿量的作用下，附近的状态变得可区分的速度。该方法非常简单：我们见证了多体纠缠，只是详细说明了已发表的离子和光子实验数据。统计速度和纠缠之间的联系提供了一个统一的框架，可以为量子信息科学和量子临界现象提供新的线索。量子力学预言了复合系统之间存在的相关性，尽管这些相关性令我们的物理直觉感到困惑，但它使经典世界无法获得的技术成为可能。尽管如此，仍然没有有效的通用方法来理论量化和实验检测多量子比特的纠缠。在这里，我们建议通过测量量子系统对任意非局域参数演化的统计响应来检测纠缠。我们见证纠缠不依赖于量子态的层析重建，或见证算子的实现。该协议需要两个集体设置为任何数量的缔约方，是强大的对噪声和退相干后发生的参数变换的实施。为了说明它的用户友好性，我们证明了多体纠缠在不同的实验中与离子和光子通过分析已发表的数据的保真度vibrium和方差的集体观测。
Significance The experimental detection and theoretical characterization of entanglement in many-body systems is a mostly unsolved problem. Here we relate entanglement to the statistical speed measuring how quickly nearby states become distinguishable under the action of an arbitrary many-body Hamiltonian. The method is remarkably simple: We witness multipartite entanglement, just elaborating on published experimental data with ions and photons. The unveiled connection between the statistical speed and entanglement provides a unifying framework that can shed new light on quantum information science and quantum critical phenomena. Quantum mechanics predicts the existence of correlations between composite systems that, although puzzling to our physical intuition, enable technologies not accessible in a classical world. Notwithstanding, there is still no efficient general method to theoretically quantify and experimentally detect entanglement of many qubits. Here we propose to detect entanglement by measuring the statistical response of a quantum system to an arbitrary nonlocal parametric evolution. We witness entanglement without relying on the tomographic reconstruction of the quantum state, or the realization of witness operators. The protocol requires two collective settings for any number of parties and is robust against noise and decoherence occurring after the implementation of the parametric transformation. To illustrate its user friendliness we demonstrate multipartite entanglement in different experiments with ions and photons by analyzing published data on fidelity visibilities and variances of collective observables.
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影响因子：
19.6
作者：
Hauke, Philipp;Heyl, Markus;Zoller, Peter
通讯作者：
Zoller, Peter
DOI：
10.1038/nphys2705
发表时间：
2013-03
期刊：
Bulletin of the American Physical Society
影响因子：
--
作者：
J. Barreiro;J. Bancal;P. Schindler;D. Nigg;M. Hennrich;T. Monz;N. Gisin;R. Blatt
通讯作者：
J. Barreiro;J. Bancal;P. Schindler;D. Nigg;M. Hennrich;T. Monz;N. Gisin;R. Blatt
影响因子：
8.6
作者：
Sperling, J.;Vogel, W.
通讯作者：
Vogel, W.
影响因子：
56.9
作者：
Bohnet, Justin G.;Sawyer, Brian C.;Bollinger, John J.
通讯作者：
Bollinger, John J.
影响因子：
8.6
作者：
Bouwmeester, D;Pan, JW;Zeilinger, A
通讯作者：
Zeilinger, A