Normal Quantum Computing. USA is the leader.
Quantum communication based on quantum entanglement. China has developed the longest range entanglement possible so far (90 miles vs. 30 miles). Its a leap but not that serious. 量子计算有3个重大突破： 1、Adiabiatic量子计算机，加拿大公司D-Wave是这方面的领先者 2、正常的量子计算，美国这方面领先 3、基于量子纠缠的量子通信，中国研发出了最长距离的量子纠缠，这是一个飞跃 Igor Markov Not any close, as far as I know.
Austria, Australia, US and Canada seem at the forefront -- based on theoretical contributions, engineering efforts, as well as working implementations, many of which have been working for 10 years now. If you ask if China is leading in claimed results in quantum communication technology, the answer may be different - I don't know. 据我所知，并非一个水平的。 从理论贡献、工程计划以及工程实施来看，奥地利、澳大利亚、美国和加拿大似乎处于前沿。很多已经研究了10年。 如果是问中国的量子通信技术是否领先，答案也许不一样。 Russell Munroe It's hard to know for sure. Those programs are mostly top secret military programs in the US, and no real information of their successes of failures have become public. All we know for sure is the US spends vast sums spying on China, and billions more on high-tech investments. The worst that could be is they are neck and neck in that race 很难确定。在美国，这些项目大多数是绝密的军事计划，并未有任何相关信息公之于众。 大家都知道，美国不仅投入巨资进行高科技研发，还大规模对中国展开刺探活动。 最坏的情况无非是，两国在量子竞赛中并驾齐驱