Deterministic generation of a cluster state of entangled photons
Deterministic generation of a cluster state of entangled photons
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DOI：
10.1126/science.aah4758
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发表时间：
2016-10-28
期刊：
影响因子：
56.9
通讯作者：
Gershoni, D.
中科院分区：
文献类型：
--
作者：
Schwartz, I.;Cogan, D.;Gershoni, D.
光子团簇态是一种仅基于单光子测量的量子计算资源。我们使用半导体量子点通过周期性地定时激发进动物质量子比特来确定地产生团簇状态下的长串偏振纠缠光子。在每个周期中，一个纠缠的光子被添加到由物质量子比特和先前发射的光子形成的团簇状态中。在我们的原型装置中，量子比特是受限的暗激子，它产生数百个光子串，其中纠缠持续五个连续的光子。测量的表征该器件的工艺图与理想器件的工艺图的保真度为0.81。对该装置的进一步可行改进可能会减少光量子信息处理所需的资源。
Photonic cluster states are a resource for quantum computation based solely on single-photon measurements. We use semiconductor quantum dots to deterministically generate long strings of polarization-entangled photons in a cluster state by periodic timed excitation of a precessing matter qubit. In each period, an entangled photon is added to the cluster state formed by the matter qubit and the previously emitted photons. In our prototype device, the qubit is the confined dark exciton, and it produces strings of hundreds of photons in which the entanglement persists over five sequential photons. The measured process map characterizing the device has a fidelity of 0.81 with that of an ideal device. Further feasible improvements of this device may reduce the resources needed for optical quantum information processing.