تقرير
Deterministic delivery of remote entanglement on a quantum network
| العنوان: | Deterministic delivery of remote entanglement on a quantum network |
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| المؤلفون: | Humphreys, Peter C., Kalb, Norbert, Morits, Jaco P. J., Schouten, Raymond N., Vermeulen, Raymond F. L., Twitchen, Daniel. J., Markham, Matthew, Hanson, Ronald |
| المصدر: | Nature 558, pages 268-273 (2018) |
| سنة النشر: | 2017 |
| المجموعة: | Quantum Physics |
| مصطلحات موضوعية: | Quantum Physics |
| الوصف: | 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. Comment: v2 - updated to include relevant citation |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1038/s41586-018-0200-5 |
| URL الوصول: | http://arxiv.org/abs/1712.07567 |
| رقم الأكسشن: | edsarx.1712.07567 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1038/s41586-018-0200-5 |
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