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SUMMARY:Quanta Measurements are Indirect only
DTSTART;VALUE=DATE-TIME:20260922T130500Z
DTEND;VALUE=DATE-TIME:20260922T131000Z
DTSTAMP;VALUE=DATE-TIME:20260914T055109Z
UID:indico-contribution-558@indico.bitp.kiev.ua
DESCRIPTION:Speakers: Constantin Usenko (BITP)\nThe report presents  resul
 ts  of the Heisenberg Cut study in the theory of quantum measurement. The 
 solution to the problem was obtained thanks to perception of the impossibi
 lity of direct quanta measurement. An indirect test requires a deepening o
 f the random variable definition  via the Kolmogorov triad by the Frechet 
 representation of a random element.\n\nMeasurement in general is a purpose
 ful activity aimed at obtaining or at least deepening information about th
 e measured object\, therefore\, the theory of measurement contains\, along
  with a description of physical processes\, a description of the process o
 f converting the characteristics of the object into information.\n \nThe t
 erm "Measurement" as applied to quanta has three different interpretations
 . The simplest one means the act of interaction of a quantum with a measur
 ing device\, which ends in obtaining a certain value of the observable and
  a certain state of the quantum.\n Another interpretation is a series of t
 ests of a quantum in the same state using a single instrument. The uncerta
 inty in the measurement results of a non-degenerate observable is inversel
 y proportional to the square root of the number of tests.\nAnother interpr
 etation of the term "Measurement" is a set of such series with different i
 ncompatible devices\, such a measurement allows determining the state of a
  quantum if the number of incompatible devices is greater than the number 
 of independent degrees of freedom of the quantum.\n  \n\nThe specificity o
 f indirect measurement is the division of the measuring device into a mete
 r and a register. The meter directly interacts with the object of measurem
 ent\, the register messures  change  of the meter state to one that corres
 ponds to a certain measurement result. The Heisenberg cut is located betwe
 en the meter and the register.\n\nA sign of the classical nature of measur
 ement here is the incompleteness of the determination of the quantum state
  of the meter due to the use of degenerate observables\, when the relative
  decrease in the von Neumann entropy of the meter state in the process of 
 state recognition is small\, but the information obtained is sufficient to
  distinguish the results of the quantum measurement.\n\nhttps://indico.bit
 p.kiev.ua/event/18/contributions/558/
LOCATION:Bogolyubov Institute for Theoretical Physics Conference Hall
URL:https://indico.bitp.kiev.ua/event/18/contributions/558/
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