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Deterministic delivery of remote entanglement on a quantum network

zqyin 添加于 2017-12-21 09:38 | 1311 次阅读 | 0 个评论

作者
Humphreys PC, Kalb N, Morits JPJ, Schouten RN, Vermeulen RFL, Twitchen DJ, Markham M, Hanson R
摘要
Large-scale quantum networks promise to enable secure communication, distributed quantum computing, enhanced sensing and fundamental tests of quantum mechanics through the distribution of entanglement across nodes. Moving beyond current two-node networks requires the rate of entanglement generation between nodes to exceed their decoherence rates. Beyond this critical threshold, intrinsically probabilistic entangling protocols can be subsumed into a powerful building block that deterministically provides remote entangled links at pre-specified times. Here we surpass this threshold using diamond spin qubit nodes separated by 2 metres. We realise a fully heralded single-photon entanglement protocol that achieves entangling rates up to 39 Hz, three orders of magnitude higher than previously demonstrated two-photon protocols on this platform. At the same time, we suppress the decoherence rate of remote entangled states to 5 Hz by dynamical decoupling. By combining these results with efficient charge-state control and mitigation of spectral diffusion, we are able to deterministically deliver a fresh remote state with average entanglement fidelity exceeding 0.5 at every clock cycle of $sim$100 ms without any pre- or post-selection. These results demonstrate a key building block for extended quantum networks and open the door to entanglement distribution across multiple remote nodes.
详细资料
- 关键词: quant-ph
- 文献种类: Manual Script
- 期卷页: 2017年
- 日期: 2017-12-21
- 发布方式: arXiv e-prints
- 备注:http://arxiv.org/abs/1712.07567v1
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