Noninvasiveness and time symmetry of weak measurements

Bednorz, Adam; Franke, Kurt; Belzig, Wolfgang

Noninvasiveness and time symmetry of weak measurements

Dateien

Bednorz_224789.pdfGröße: 1.11 MBDownloads: 238

Datum

2013

Open Access-Veröffentlichung

Open Access Gold

Sammlungen

Physik

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

New Journal of Physics. 2013, 15(2), 023043. ISSN 1367-2630. eISSN 1367-2630. Available under: doi: 10.1088/1367-2630/15/2/023043

Zusammenfassung

Measurements in classical and quantum physics are described in fundamentally different ways. Nevertheless, one can formally define similar measurement procedures with respect to the disturbance they cause. Obviously, strong measurements, both classical and quantum, are invasive—they disturb the measured system. We show that it is possible to define general weak measurements, which are noninvasive: the disturbance becomes negligible as the measurement strength goes to zero. Classical intuition suggests that noninvasive measurements should be time symmetric (if the system dynamics is reversible) and we confirm that correlations are time-reversal symmetric in the classical case. However, quantum weak measurements - defined analogously to their classical Counterparts - can be noninvasive but not time symmetric. We present a simple example of measurements on a two-level system which violates time symmetry and propose an experiment with quantum dots to measure the timesymmetry violation in a third-order current correlation function.

Fachgebiet (DDC)

530 Physik

Zitieren

ISO 690

BEDNORZ, Adam, Kurt FRANKE, Wolfgang BELZIG, 2013. Noninvasiveness and time symmetry of weak measurements. In: New Journal of Physics. 2013, 15(2), 023043. ISSN 1367-2630. eISSN 1367-2630. Available under: doi: 10.1088/1367-2630/15/2/023043

BibTex

@article{Bednorz2013Nonin-22478,
  year={2013},
  doi={10.1088/1367-2630/15/2/023043},
  title={Noninvasiveness and time symmetry of weak measurements},
  number={2},
  volume={15},
  issn={1367-2630},
  journal={New Journal of Physics},
  author={Bednorz, Adam and Franke, Kurt and Belzig, Wolfgang},
  note={Article Number: 023043}
}

RDF

<rdf:RDF
    xmlns:dcterms="http://purl.org/dc/terms/"
    xmlns:dc="http://purl.org/dc/elements/1.1/"
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:bibo="http://purl.org/ontology/bibo/"
    xmlns:dspace="http://digital-repositories.org/ontologies/dspace/0.1.0#"
    xmlns:foaf="http://xmlns.com/foaf/0.1/"
    xmlns:void="http://rdfs.org/ns/void#"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > 
  <rdf:Description rdf:about="https://kops.uni-konstanz.de/server/rdf/resource/123456789/22478">
    <dcterms:issued>2013</dcterms:issued>
    <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2013-04-03T11:16:56Z</dcterms:available>
    <dc:creator>Belzig, Wolfgang</dc:creator>
    <dcterms:rights rdf:resource="http://creativecommons.org/licenses/by-nc-sa/3.0/"/>
    <foaf:homepage rdf:resource="http://localhost:8080/"/>
    <dc:creator>Bednorz, Adam</dc:creator>
    <dcterms:title>Noninvasiveness and time symmetry of weak measurements</dcterms:title>
    <dc:language>eng</dc:language>
    <dcterms:bibliographicCitation>New Journal of Physics ; 15 (2013). - 023043</dcterms:bibliographicCitation>
    <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/41"/>
    <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/22478"/>
    <dc:contributor>Belzig, Wolfgang</dc:contributor>
    <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/>
    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2013-04-03T11:16:56Z</dc:date>
    <dcterms:abstract xml:lang="eng">Measurements in classical and quantum physics are described in fundamentally different ways. Nevertheless, one can formally define similar measurement procedures with respect to the disturbance they cause. Obviously, strong measurements, both classical and quantum, are invasive—they disturb the measured system. We show that it is possible to define general weak measurements, which are noninvasive: the disturbance becomes negligible as the measurement strength goes to zero. Classical intuition suggests that noninvasive measurements should be time symmetric (if the system dynamics is reversible) and we confirm that correlations are time-reversal symmetric in the classical case. However, quantum weak measurements - defined analogously to their classical Counterparts - can be noninvasive but not time symmetric. We present a simple example of measurements on a two-level system which violates time symmetry and propose an experiment with quantum dots to measure the timesymmetry violation in a third-order current correlation function.</dcterms:abstract>
    <dc:rights>Attribution-NonCommercial-ShareAlike 3.0 Unported</dc:rights>
    <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/41"/>
    <dc:creator>Franke, Kurt</dc:creator>
    <dc:contributor>Franke, Kurt</dc:contributor>
    <dc:contributor>Bednorz, Adam</dc:contributor>
    <dcterms:hasPart rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/22478/2/Bednorz_224789.pdf"/>
    <dspace:hasBitstream rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/22478/2/Bednorz_224789.pdf"/>
  </rdf:Description>
</rdf:RDF>

Universitätsbibliographie

Ja