Quantum physicists show that imperfect timekeeping places a fundamental limit to quantum computers and their applications.
The team claims that even tiny timing errors add up to place a significant impact on any large-scale algorithm, posing another problem that must eventually be solved if quantum computers are to fulfill the lofty aspirations that society has for them.New research from a consortium of quantum physicists, led by Trinity College Dublin's Dr Mark Mitchison, shows that imperfect timekeeping places a fundamental limit to quantum computers and their applications.
Currently, however, quantum computers are still too small to be useful. A major challenge to scaling them up is the extreme fragility of the quantum states that are used to encode information. In the macroscopic world, this is not a problem. For example, you can add numbers perfectly using an abacus, in which wooden beads are pushed back and forth to represent arithmetic operations.
The team is quick to emphasise that the message is not entirely pessimistic, because the problem could be mitigated in the future by designing clever error correction protocols.
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