Demonstrating W-type entanglement of Dicke states in resonant cavity quantum electrodynamics

被引：39

作者：

Mlynek, J. A. ^{[1
]}

Abdumalikov, A. A., Jr. ^{[1
]}

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

Steffen, L. ^{[1
]}

Baur, M. ^{[1
]}

Lang, C. ^{[1
]}

van Loo, A. F. ^{[1
]}

Wallraff, A. ^{[1
]}

机构：

[1] ETH, Dept Phys, CH-8093 Zurich, Switzerland

来源：

PHYSICAL REVIEW A | 2012年 / 86卷 / 05期

基金：

瑞士国家科学基金会;

关键词：

Quantum optics - Quantum computers - Electric excitation - Electromagnetic fields - Quantum electronics - Quantum entanglement;

D O I：

10.1103/PhysRevA.86.053838

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Nonlinearity and entanglement are two important properties by which physical systems can be identified as nonclassical. We study the dynamics of the resonant interaction of up to N = 3 two-level systems and a single mode of the electromagnetic field sharing a single excitation dynamically. We observe coherent vacuum Rabi oscillations and their nonlinear root N speedup by tracking the populations of all qubits and the resonator in time. We use quantum state tomography to show explicitly that the dynamics generates maximally entangled states of the W class in a time limited only by the collective interaction rate. We use an entanglement witness and the 3-tangle to characterize the state whose fidelity F = 78% is limited in our experiments by crosstalk arising during the simultaneous qubit manipulations which is absent in a sequential approach with F = 91%.

引用

页数：5

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