Entangled States of More Than 40 Atoms in an Optical Fiber Cavity
Entangled States of More Than 40 Atoms in an Optical Fiber Cavity
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DOI：
10.1126/science.1248905
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发表时间：
2014-04-11
期刊：
影响因子：
56.9
通讯作者：
Esteve, Jerome
中科院分区：
文献类型：
--
作者：
Haas, Florian;Volz, Juergen;Esteve, Jerome
多粒子纠缠使量子模拟、量子计算和量子增强计量学成为可能。然而，随着量子比特数量的增加，几乎没有方法可以在保持单量子比特分辨率的同时产生和测量这种纠缠。利用原子芯片和光纤腔，我们开发了一种基于非破坏性集体测量和条件演化的方法来创建对称纠缠态并对其进行层析成像。我们演示了平均原子数高达41的纠缠态的产生和分析，并在实验上证明了多粒子纠缠。我们的方法是独立的原子数，并应允许推广到其他纠缠态和其他物理实现，包括电路量子电动力学。
Multiparticle entanglement enables quantum simulations, quantum computing, and quantum-enhanced metrology. Yet, there are few methods to produce and measure such entanglement while maintaining single-qubit resolution as the number of qubits is scaled up. Using atom chips and fiber-optical cavities, we have developed a method based on nondestructive collective measurement and conditional evolution to create symmetric entangled states and perform their tomography. We demonstrate creation and analysis of entangled states with mean atom numbers up to 41 and experimentally prove multiparticle entanglement. Our method is independent of atom number and should allow generalization to other entangled states and other physical implementations, including circuit quantum electrodynamics.