2 ms·Published in PRL. preprint: http://arxiv.org/pdf/1402.4119v2.pdf http://arxiv.org/pdf/1402.4119v2.pdfby danielmorozoff 10y agoPublished in PRL. preprint: http://arxiv.org/pdf/1402.4119v2.pdf http://arxiv.org/pdf/1402.4119v2.pdf