Procedure for direct measurement of general quantum states using weak measurement

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DOIResolve DOI: http://doi.org/10.1103/PhysRevLett.108.070402
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TypeArticle
Journal titlePhysical Review Letters
ISSN0031-9007
Volume108
Issue7
Article number70402
SubjectDensity matrix; Direct measurement; In-situ; Mixed state; Operational definition; Quantum state; Weak measurements; Measurements; Quantum optics; Quantum theory
AbstractRecent work by Lundeen et al. directly measured the wave function by weakly measuring a variable followed by a normal (i.e., "strong") measurement of the complementary variable. We generalize this method to mixed states by considering the weak measurement of various products of these observables, thereby providing the density matrix an operational definition in terms of a procedure for its direct measurement. The method only requires measurements in two bases and can be performed in situ, determining the quantum state without destroying it. © 2012 American Physical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for National Measurement Standards (INMS-IENM)
Peer reviewedYes
NPARC number21269506
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Record identifier80f0c646-4dab-4aeb-bf05-8897d1d06d11
Record created2013-12-12
Record modified2016-05-09
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