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, Rudi; Cohen, Eliahu; Villa, Federica; Tosi, Alberto; Vaidman, Lev; Virzì, Salvatore; Rebufello, Enrico; Degiovanni, Ivo Pietro; Piacentini, Fabrizio; Avella, Alessio; Brida, Giorgio; Genovese, Marco; Gramegna, Marco. - ELETTRONICO. - 10674:(2018), p. 24. (Intervento presentato al convegno SPIE PHOTONICS EUROPE tenutosi a Strasburgo (FR) nel 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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