The NSA is building a quantum computer to crack almost every kind of encryption | ExtremeTech

January 3, 2014:   As for when we might actually see the first useful quantum computer, I would put my money on “the next five years.” We are now getting to the point where coherence on a single-qubit level is not so much of an issue, allowing researchers to move onto the trickier topic of stringing multiple fully entangled qubits together, and the necessary error checking/fault tolerance measures that go along with multi-qubit setups. From what it’s published so far, the Laboratory for Physical Sciences, which is carrying out the NSA’s quantum computing work under contract, doesn’t seem to be leading the pack in terms of building a quantum computer. IBM, with its superconducting waveguide-cavity qubits, appears to be closer to realizing a quantum computer.

Source: The NSA is building a quantum computer to crack almost every kind of encryption | ExtremeTech

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