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Statements

Subject Item
n2:RIV%2F00216224%3A14330%2F11%3A00054359%21RIV12-MSM-14330___
rdf:type
skos:Concept n15:Vysledek
dcterms:description
Given an unknown state of a qudit that has already been measured optimally, can one still extract any information about the original unknown state? Clearly, after a maximally informative measurement, the state of the system collapses into a postmeasurement state from which the same observer cannot obtain further information about the original state of the system. However, the system still encodes a significant amount of information about the original preparation for a second observer who is unaware of the actions of the first one. We study how a series of independent observers can obtain, or can scavenge, information about the unknown state of a system (quantified by the fidelity) when they sequentially measure it. We give closed-form expressions for the estimation fidelity when one or several qudits are available to carry information about the single-qudit state, and we study the classical limit when an arbitrarily large number of observers can obtain (nearly) complete information on the system. Given an unknown state of a qudit that has already been measured optimally, can one still extract any information about the original unknown state? Clearly, after a maximally informative measurement, the state of the system collapses into a postmeasurement state from which the same observer cannot obtain further information about the original state of the system. However, the system still encodes a significant amount of information about the original preparation for a second observer who is unaware of the actions of the first one. We study how a series of independent observers can obtain, or can scavenge, information about the unknown state of a system (quantified by the fidelity) when they sequentially measure it. We give closed-form expressions for the estimation fidelity when one or several qudits are available to carry information about the single-qudit state, and we study the classical limit when an arbitrarily large number of observers can obtain (nearly) complete information on the system.
dcterms:title
Scavenging quantum information: Multiple observations of quantum systems Scavenging quantum information: Multiple observations of quantum systems
skos:prefLabel
Scavenging quantum information: Multiple observations of quantum systems Scavenging quantum information: Multiple observations of quantum systems
skos:notation
RIV/00216224:14330/11:00054359!RIV12-MSM-14330___
n15:predkladatel
n20:orjk%3A14330
n5:aktivita
n8:Z
n5:aktivity
Z(MSM0021622419)
n5:cisloPeriodika
3
n5:dodaniDat
n11:2012
n5:domaciTvurceVysledku
n10:4347196
n5:druhVysledku
n13:J
n5:duvernostUdaju
n7:S
n5:entitaPredkladatele
n17:predkladatel
n5:idSjednocenehoVysledku
228225
n5:idVysledku
RIV/00216224:14330/11:00054359
n5:jazykVysledku
n19:eng
n5:klicovaSlova
Quantum information processing; quantum measurement
n5:klicoveSlovo
n12:quantum%20measurement n12:Quantum%20information%20processing
n5:kodStatuVydavatele
US - Spojené státy americké
n5:kontrolniKodProRIV
[FDD32F5D56BE]
n5:nazevZdroje
Physical Review A
n5:obor
n18:IN
n5:pocetDomacichTvurcuVysledku
1
n5:pocetTvurcuVysledku
5
n5:rokUplatneniVysledku
n11:2011
n5:svazekPeriodika
84
n5:tvurceVysledku
Calsamiglia, John Rapčan, Peter Bagan, Emilio Munoz-Tapia, Ramon Bužek, Vladimír
n5:wos
000295044300003
n5:zamer
n14:MSM0021622419
s:issn
1050-2947
s:numberOfPages
16
n4:doi
10.1103/PhysRevA.84.032326
n16:organizacniJednotka
14330