# Browse Physics

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A miniature time machine, possibly based on a wormhole through spacetime, could be used to break a super-secure quantum code.

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Creating a practical solid-state quantum computer is seriously hard. Getting such a computer to operate at room temperature is even more challenging. Is such a quantum computer possible at all? If so, which schemes might have a chance of success?

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A rigorous estimate shows that an error correction code for a scalable quantum computer can accommodate error at the 0.1% level—about ten times more tolerant than most other methods.

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Preparing a harmonic oscillator in a state with a well-defined energy is a tricky business. With the new tools provided by cavity and circuit quantum electrodynamics it is now possible to make these pure quantum states and watch how they evolve in time.

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Large-scale quantum computers are hard to construct because quantum systems easily lose their coherence through interaction with the environment. Researchers have tried to avoid this problem by using geometric phase shifts in the design of quantum gates to perform information processing. Experiments and simulations have shown that these gates may be tolerant to certain types of faults, and may therefore be useful for robust quantum computation.

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The Universe may be described as a giant quantum computer, according to a researcher who calculates its total computing power.

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Microscopic pinholes may soon allow the one-by-one transfer of photons in a way that mimics the process of Coulomb blockade of electrons.

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Portfolio techniques borrowed from the world of finance could aid quantum computing.