Archivio Istituzionale della RicercaIn 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 ensambles 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.
Protective measurements: extracting the expectation value by measuring a single particle / Lussana, R., Cohen, E., Villa, F., Tosi, A., Vaidman, L., Virzì, S., Rebufello, E., Degiovanni, I.P., Piacentini, F., Avella, A., Brida, G., Genovese, M., Gramegna, M.. - ELETTRONICO. - 10674:(2018), p. 24. (SPIE PHOTONICS EUROPE Strasburgo (FR) 22-26 April 2018) [10.1117/12.2307692].
Protective measurements: extracting the expectation value by measuring a single particle
REBUFELLO, ENRICO;
2018
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 ensambles 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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https://hdl.handle.net/11583/2719732
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