A study in science shows the trick can extend to cloud services such as Google Docs without loss of security. Quantum cryptography uses this feature to send the keys to decrypting messages with high security. The world in which both are accessible to consumers has seemed distant. Long-distance quantum cryptography has already been demonstrated in a real-world application: the technology was put to use in elections in Switzerland in 2007 using a custom network of fibers.
The new work, by University of Vienna quantum computing pioneer Anton Zeilinger and a team of international scientists, combines the two. The remote computer blindly entangles the unfamiliar bits, carries out the steps, and sends the qubits back down the line, solving the problem without ever decoding what is going on.