As of today, no one can tell when a universal quantum computer with thousandsof logical quantum bits (qubits) will be built. At present, most quantumcomputer prototypes involve less than ten individually controllable qubits, andonly exist in laboratories for the sake of either the great costs of devices orprofessional maintenance requirements. Moreover, scientists believe thatquantum computers will never replace our daily, every-minute use of classicalcomputers, but would rather serve as a substantial addition to the classicalones when tackling some particular problems. Due to the above two reasons,cloud-based quantum computing is anticipated to be the most useful andreachable form for public users to experience with the power of quantum. Asinitial attempts, IBM Q has launched influential cloud services on asuperconducting quantum processor in 2016, but no other platforms has followedup yet. Here, we report our new cloud quantum computing service -- NMRCloudQ(http://nmrcloudq.com/zh-hans/), where nuclear magnetic resonance, one of thepioneer platforms with mature techniques in experimental quantum computing,plays as the role of implementing computing tasks. Our service provides acomprehensive software environment preconfigured with a list of quantuminformation processing packages, and aims to be freely accessible to eitheramateurs that look forward to keeping pace with this quantum era orprofessionals that are interested in carrying out real quantum computingexperiments in person. In our current version, four qubits are already usablewith in average 1.26% single-qubit gate error rate and 1.77% two-qubitcontrolled-NOT gate error rate via randomized benchmaking tests. Improvedcontrol precisions as well as a new seven-qubit processor are also inpreparation and will be available later.
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