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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-1061
DTSTART:20080307T220000Z
DURATION:PT1H0M0S
DTSTAMP:20260409T030852Z
LAST-MODIFIED:20080306T193726Z
LOCATION:2241 Chamberlin Hall (coffee at 3:30 pm)
SUMMARY:Quantum Measurements: From a Philosophical Dilemma to a Techno
 logical Resource\, Physics Department Colloquium\, Klaus Molmer\, Depa
 rtment of Physics and Astronomy University of Aarhus\, Denmark
DESCRIPTION:The famous discussions between Niels Bohr and Albert Einst
 ein on the interpretation of quantum mechanics did not resolve their m
 ain issue which concerned the indeterminacy of measurements on individ
 ual quantum systems\, and even today there is no\, commonly agreed upo
 n\, understanding of the quantum measurement problem. The experimental
  situation and hence the subjects of theoretical investigations have\,
  however\, been considerably refined since the early days of quantum m
 echanics. Without claiming a solution to the more philosophical questi
 ons we now have an effective formalism that describes quantum systems 
 that are made subject to measurements. After a brief review of the dev
 elopment of this formalism\, we will turn to its use and consequences.
  We will discuss how\, e.g.\, an atomic quantum system is not only dri
 ven by the fields that we shine on the atoms but also by the measureme
 nts that we perform on the fields that they emit. This has far reachin
 g applications for our means to control quantum systems\, and a few ke
 y examples will be presented of schemes for the preparation of specifi
 c quantum states\, generation of entanglement\, and transfer and proce
 ssing of quantum information that rely on measurements and perform wit
 h much higher success probability than if they were based on the time 
 evolution under a given Hamiltonian. We conclude with a discussion of 
 the prospects of applying conditional feedback to continuously observe
 d quantum systems. 
URL:https://www.physics.wisc.edu/events/?id=1061
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