The Doppler Quarterly Spring 2019 - Page 31

This also means that a failure in the communication channel cannot cause an information leak. Hence, a quantum com- puter is the most promising system to safeguard privacy in the future, for both communications and public cloud computing. Quantum computing can therefore find many uses in finan- cial services applications, pharmaceutical research, block- chain, pure science research or any use case that involves large, simultaneous computing. Quantum Cryptography Is Already Here In January 2018, a joint China-Austria team demonstrated that communication between continents with quantum encryption was possible. It is the first practical proof that the technology that allows net- works to use quantum encryp- tion is already available. Com- mercial implementations may not be too far behind. Quantum computers are expected to play an important future role in information processing, since they can out- perform classical computers at many tasks. Considering the challenges inherent in building quantum devices, it is con- ceivable that future quantum computing capabilities will exist only in a few specialized facilities around the world – much like today’s supercomputers. Users would interact with those specialized facilities to outsource their quantum computations. This scenario follows the current trend of cloud computing: using central remote servers to store and process data – doing everything in the cloud. Companies such as Microsoft, IBM and Google provide quantum cloud offerings for researchers. Their obvious challenge is to make globalized computing safe, ensuring that users’ data stays private. The latest research reveals that quantum computers can provide an answer to that challenge. Quan- tum technology solves one of the key issues in distributed comput- ing: it can preserve data privacy when users interact with remote computing centers. This newly established fundamental advan- tage of quantum computers lets you delegate a quantum computa- tion from a user who does not hold any quantum computational power to a quantum server, while guaranteeing that the user’s data remains perfectly private. The quantum server performs the calculations, but has no means to find out what it is doing, a functionality not achievable in classical computing. Quantum computers are expected to play an important future role in information processing, since they can outperform classical computers at many tasks. Researchers in the Vienna Cen- ter for Quantum Science and Technology have succeeded in combining the power of quan- tum computing with the secu- rity of quantum cryptography, to show that perfectly secure cloud computing can be achieved using the principles of quantum mechanics. They per- formed an experimental demonstration of quantum computation in which the input, the data processing and the output remained unknown to the quantum computer. Called “blind quantum computing,” their work was published in Science magazine. SPRING 2019 | THE DOPPLER | 29