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Proceedings Paper

Protective measurements: extracting the expectation value by measuring a single particle
Author(s): Fabrizio Piacentini; Alessio Avella; Enrico Rebufello; Salvatore Virzì; Rudi Lussana; Federica Villa; Alberto Tosi; Marco Gramegna; Giorgio Brida; Eliahu Cohen; Lev Vaidman; Ivo Pietro Degiovanni; Marco Genovese
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Paper 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.

Paper Details

Date Published: 21 May 2018
PDF: 8 pages
Proc. SPIE 10674, Quantum Technologies 2018, 106740Q (21 May 2018); doi: 10.1117/12.2307692
Show Author Affiliations
Fabrizio Piacentini, Istituto Nazionale di Ricerca Metrologica (Italy)
Alessio Avella, Istituto Nazionale di Ricerca Metrologica (Italy)
Enrico Rebufello, Istituto Nazionale di Ricerca Metrologica (Italy)
Politecnico di Torino (Italy)
Salvatore Virzì, Istituto Nazionale di Ricerca Metrologica (Italy)
Univ. degli Studi di Torino (Italy)
Rudi Lussana, Politecnico di Milano (Italy)
Federica Villa, Politecnico di Milano (Italy)
Alberto Tosi, Politecnico di Milano (Italy)
Marco Gramegna, Istituto Nazionale di Ricerca Metrologica (Italy)
Giorgio Brida, Istituto Nazionale di Ricerca Metrologica (Italy)
Eliahu Cohen, Univ. of Bristol (United Kingdom)
Lev Vaidman, Tel Aviv Univ. (Israel)
Ivo Pietro Degiovanni, Istituto Nazionale di Ricerca Metrologica (Italy)
Marco Genovese, Istituto Nazionale di Ricerca Metrologica (Italy)


Published in SPIE Proceedings Vol. 10674:
Quantum Technologies 2018
Jürgen Stuhler; Andrew J. Shields; Miles J. Padgett, Editor(s)

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