# Browse Physics

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An entangled state of six photons could potentially carry quantum information over large distances and between different reference frames.

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Researchers have measured the overlap time of an entangled pair of photons by treating them like ordinary laser pulses.

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A system familiar in condensed matter—particles on a hexagonal lattice—could be a useful initial state for a one-way quantum computer.

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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.