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This being hacker news, I can't help but wonder about the implications for quantum computing. Maybe this is already an answered question, but can one read a Q-b
by mabbo 12y ago
This being hacker news, I can't help but wonder about the implications for quantum computing. Maybe this is already an answered question, but can one read a Q-bit without interaction that might break it's entanglement?
- Strilanc 12y agoThe term you're looking for is counterfactual computation [1]: > We show that "interaction-free" measurements can be regarded as counterfactual computations, and our results then imply that N [the number of times that the computer is not run] must be large if the probability of interaction is to be close to zero. Finally, we consider some ways in which our formulation of counterfactual computation can be generalised. 1: http://arxiv.org/abs/quant-ph/9907007 http://arxiv.org/abs/quant-ph/9907007
- debt 12y agoI believe this was posted to HN recently: http://phys.org/news/2013-10-quantum-trajectory-superconducting-bit.html http://phys.org/news/2013-10-quantum-trajectory-superconduct... Or something similar to it. There are few techniques to observe quantum state.
- ClayFerguson 12y agoAs far as I have ever heard, you must collapse the wave function to measure a Q-bit, and that is when entanglement always stops. However if we can create systems where a collapse can always 'retrigger' a new entanglement we could theoretically create computers that run at the Planc Time as the clock rate, but we don't know how to do that yet. That's decades off, or centuries.