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Keyword: quantummetrology

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  • 'Quantum negativity' can power ultra-precise measurements

    07/29/2020 8:08:06 AM PDT · by BenLurkin · 7 replies
    Phys.org ^ | July 29, 2020 | by University of Cambridge
    Metrology is the science of estimations and measurements. We are used to dealing with probabilities that range from 0% (never happens) to 100% (always happens). To explain results from the quantum world however, the concept of probability needs to be expanded to include a so-called quasi-probability, which can be negative. This quasi-probability allows quantum concepts such as Einstein's 'spooky action at a distance' and wave-particle duality to be explained in an intuitive mathematical language. An experiment whose explanation requires negative probabilities is said to possess 'quantum negativity.' In state-of-the-art metrology however, the probes are quantum particles, which can be controlled...