Quantum measurement is a nontrivial physical process connecting the quantum and classical worlds. However in contrast to classical measurement, any quantum detection process unavoidably introduces decoherence in the quantum system, thus leading to a detrimental effect which establish a bound on the knowledge, i.e. the information, extractable from the system. In order to avoid such problem, a partial measurement approach can be adopted, whose aim is to extract only a partial amount of information from the quantum system at cost of limited decoherence induced [1]. In general, this partial measurement consists from two steps: coupling of measured system to an available meter and projective measurement on the meter. The aim of the work is to investigate a non-demolishing measurement strategy which allows to maximize the amount of information extracted from an entangled quantum state, given a certain amount of induced decoherence on the whole system. The protocol can be applied to a single measurement step, as well as extended to a number N of sequential measurements. Furthermore we demonstrate that by implementing a sequence of non-demolishing measurement on the state, it is still possible to achieve a strategy which leads to an optimal trade off between knowledge and decoherence induced. © 2011 IEEE.

Sequential quantum measurements on entangled states2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC) / Nagali, Eleonora; Simone, Felicetti; Pierre Louis de, Assis; Radim, Filip; Sciarrino, Fabio. - (2011), pp. 1-1. (Intervento presentato al convegno 2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011 tenutosi a Munich; Germany) [10.1109/CLEOE.2011.5943395].

Sequential quantum measurements on entangled states2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)

NAGALI, ELEONORA;SCIARRINO, Fabio
2011

Abstract

Quantum measurement is a nontrivial physical process connecting the quantum and classical worlds. However in contrast to classical measurement, any quantum detection process unavoidably introduces decoherence in the quantum system, thus leading to a detrimental effect which establish a bound on the knowledge, i.e. the information, extractable from the system. In order to avoid such problem, a partial measurement approach can be adopted, whose aim is to extract only a partial amount of information from the quantum system at cost of limited decoherence induced [1]. In general, this partial measurement consists from two steps: coupling of measured system to an available meter and projective measurement on the meter. The aim of the work is to investigate a non-demolishing measurement strategy which allows to maximize the amount of information extracted from an entangled quantum state, given a certain amount of induced decoherence on the whole system. The protocol can be applied to a single measurement step, as well as extended to a number N of sequential measurements. Furthermore we demonstrate that by implementing a sequence of non-demolishing measurement on the state, it is still possible to achieve a strategy which leads to an optimal trade off between knowledge and decoherence induced. © 2011 IEEE.
2011
2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011
Amount of information; Decoherence; Detrimental effects
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
Sequential quantum measurements on entangled states2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC) / Nagali, Eleonora; Simone, Felicetti; Pierre Louis de, Assis; Radim, Filip; Sciarrino, Fabio. - (2011), pp. 1-1. (Intervento presentato al convegno 2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011 tenutosi a Munich; Germany) [10.1109/CLEOE.2011.5943395].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/503029
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