[institut] [phys4phys] Group for Gravitation, Particle and Fields seminar, Friday, 8 November 2024

[prlina]

Dear colleagues,

You are cordially invited to the seminar of the Group for Gravitation, 
Particles and Fields, which will be held on Friday, 8 November 2024, at 
11:00 at the Institute of Physics Belgrade, lecture hall 360.

The talk entitled:

If Mixed States Are Secretly Quickly Oscillating Pure States, Weak 
Measurements Can Detect It

will be given by Igor Prlina (Institute of Physics Belgrade).

Abstract: The apparent nonunitary evolution in the black hole 
information paradox and recent work on describing wavefunction collapse 
via nonunitary nonlinear stochastic operators has motivated us to 
analyze whether mixed states can be distinguished from quickly 
oscillating pure states. We have demonstrated that the answer is no for 
all practical purposes if only strong nonpostselected measurements are 
performed. However, if weak measurements in postselected systems are 
used, mixed states and quickly oscillating states produce different 
results. An experimental procedure is proposed which could in principle 
determine the nature of mixed states stemming from blackbody radiation, 
decoherence, thermalization in solid state materials, Unruh radiation 
and Hawking radiation, among others. The analysis in this work applies 
to all fast oscillations, including those at Planck scale. As such, 
tabletop weak measurements can be used to probe (very specific) 
potential high energy behavior, where strong nonpostselected 
measurements cannot be applied. This work also demonstrates that weak 
measurements are not equivalent to a set of strong measurements without 
postselection since measurements which are impossible for all practical 
purposes need to be excluded.

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Time: November 8, 2024 11:00 Belgrade

Institute of Physics Belgrade, lecture hall 360, 2nd floor

BigBlueButton platform link: 
https://gravityserver.ipb.ac.rs/b/mar-ae0-f4q-qww

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Best regards,
Igor Prlina
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