21 May 2018 Protective measurements: extracting the expectation value by measuring a single particle
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Abstract
In quantum mechanics, the eigenvalues and their corresponding probabilities specify the expectation value of a physical observable, which is known to be a statistical property related to large ensembles of particles. In contrast to this paradigm, we demonstrate a unique method allowing to extract the expectation value of a single particle, namely, the polarisation of a single protected photon, with a single experiment. This is the first realisation of quantum protective measurements.
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Fabrizio Piacentini, Fabrizio Piacentini, Alessio Avella, Alessio Avella, Enrico Rebufello, Enrico Rebufello, Salvatore Virzì, Salvatore Virzì, Rudi Lussana, Rudi Lussana, Federica Villa, Federica Villa, Alberto Tosi, Alberto Tosi, Marco Gramegna, Marco Gramegna, Giorgio Brida, Giorgio Brida, Eliahu Cohen, Eliahu Cohen, Lev Vaidman, Lev Vaidman, Ivo Pietro Degiovanni, Ivo Pietro Degiovanni, Marco Genovese, Marco Genovese, } "Protective measurements: extracting the expectation value by measuring a single particle", Proc. SPIE 10674, Quantum Technologies 2018, 106740Q (21 May 2018); doi: 10.1117/12.2307692; https://doi.org/10.1117/12.2307692
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