Observation of Entangled States of a Fully Controlled 20-Qubit System
Observation of Entangled States of a Fully Controlled 20-Qubit System
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DOI：
10.1103/physrevx.8.021012
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发表时间：
2018-04-10
影响因子：
12.5
通讯作者：
Lanyon, Ben
中科院分区：
文献类型：
--
作者：
Friis, Nicolai;Marty, Oliver;Lanyon, Ben
我们生成并描述了一个由20个单独控制的量子比特组成的寄存器的纠缠态，其中每个量子比特被编码成一个被捕获的原子离子的电子态。在伊辛型哈密顿量的非平衡动力学过程中，量子比特之间产生纠缠，通过激光场进行工程设计。由于量子比特-量子比特相互作用随距离衰减，纠缠在早期主要发生在相邻的量子比特群之间。我们通过设计和应用真正的多方纠缠证人来表征这些群体之间的纠缠。我们的研究结果表明，在动态演化过程中，所有相邻的量子比特对、三联体、大多数四联体和一些五联体同时发展出真正的多部纠缠。在我们的系统中，在更大的量子位群中见证真正的多方纠缠仍然是一个开放的挑战。
We generate and characterize entangled states of a register of 20 individually controlled qubits, where each qubit is encoded into the electronic state of a trapped atomic ion. Entanglement is generated amongst the qubits during the out-of-equilibrium dynamics of an Ising-type Hamiltonian, engineered via laser fields. Since the qubit-qubit interactions decay with distance, entanglement is generated at early times predominantly between neighboring groups of qubits. We characterize entanglement between these groups by designing and applying witnesses for genuine multipartite entanglement. Our results show that, during the dynamical evolution, all neighboring qubit pairs, triplets, most quadruplets, and some quintuplets simultaneously develop genuine multipartite entanglement. Witnessing genuine multipartite entanglement in larger groups of qubits in our system remains an open challenge.