Protective measurement—a new quantum measurement paradigm: Detailed description of the first realization

Enrico Rebufello; Fabrizio Piacentini; Alessio Avella; Rudi Lussana; Federica Villa; Alberto Tosi; Marco Gramegna; Giorgio Brida; Eliahu Cohen; Lev Vaidman; Ivo Pietro Degiovanni; Marco Genovese

doi:10.3390/app11094260

Protective measurement—a new quantum measurement paradigm: Detailed description of the first realization

Enrico Rebufello, Fabrizio Piacentini^*, Alessio Avella, Rudi Lussana, Federica Villa, Alberto Tosi, Marco Gramegna, Giorgio Brida, Eliahu Cohen, Lev Vaidman, Ivo Pietro Degiovanni, Marco Genovese

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

We present a detailed description of the experiment realizing for the first time a protective measurement, a novel measurement protocol which combines weak interactions with a “protection mechanism” preserving the measured state coherence during the whole measurement process. Furthermore, protective measurement allows finding the expectation value of an observable, i.e., an inherently statistical quantity, by measuring a single particle, without the need for any statistics. This peculiar property, in sharp contrast to the framework of traditional (projective) quantum measurement, might constitute a groundbreaking advance for several quantum technology related fields.

Original language	English
Article number	4260
Journal	Applied Sciences (Switzerland)
Volume	11
Issue number	9
DOIs	https://doi.org/10.3390/app11094260
State	Published - 1 May 2021

Funding

Funders	Funder number
Fetzer Franklin Fund
Israel Innovation Authority	70002, 73795
National Science Foundation?US?Israel Binational Science Foundation
Quantum Science and Technology Program of the Israeli Council of Higher Education
National Science Foundation
Silicon Valley Community Foundation
Foundational Questions Institute
Horizon 2020 Framework Programme
European Metrology Programme for Innovation and Research
United States-Israel Binational Science Foundation	FQXi-RFP-CPW-2006, 735/18
Israel Science Foundation	2064/19
PAZY Foundation

Keywords

Protective measurements
Quantum measurements
Quantum optics

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10.3390/app11094260

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abstract = "We present a detailed description of the experiment realizing for the first time a protective measurement, a novel measurement protocol which combines weak interactions with a “protection mechanism” preserving the measured state coherence during the whole measurement process. Furthermore, protective measurement allows finding the expectation value of an observable, i.e., an inherently statistical quantity, by measuring a single particle, without the need for any statistics. This peculiar property, in sharp contrast to the framework of traditional (projective) quantum measurement, might constitute a groundbreaking advance for several quantum technology related fields.",

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AU - Villa, Federica

AU - Tosi, Alberto

AU - Gramegna, Marco

AU - Brida, Giorgio

AU - Cohen, Eliahu

AU - Vaidman, Lev

AU - Degiovanni, Ivo Pietro

AU - Genovese, Marco

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Protective measurement—a new quantum measurement paradigm: Detailed description of the first realization

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