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FYI, the shot noise limit is one which exists when experimentalists are restricted to "classical" techniques, i.e. they don't use unusual quantum input states or measurements. That's probably a reasonable assumption for anything that could make it into a consumer product, but "quantum-enhanced measurements" can do better. Giovannetti et al.'s article is pretty good for those with the background:

http://www.sciencemag.org/content/306/5700/1330 http://arxiv.org/abs/quant-ph/0412078




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