[institut] [phys4phys] GPF seminar, 20th February

[Maja Buric]

Dear colleagues,

the next GPF seminar will be given by Igor Prlina on
Friday 20th of February at 11.15, in the small seminar
room on the second floor of IPB.


Title:
If Quantum Measurements Are Secretly Continuous 
Nonunitary Processes, Weak Measurements Can Detect It


Abstract:
The standard approach to quantum measurements is to assume that they lead 
to effectively instantaneous collapse of the quantum
state. However, if we assume that we are unable to enforce at what exact 
moment of time the measurement occurs due to a finite
resolution of any time measurement device, at the level of the ensemble 
the measurement would lead to an effectively nonunitary
evolution involving a mixed state. Each individual ensemble member would 
face an instantaneous collapse at different moments of
time. This process is completely indistinguishable from fundamental 
nonunitary evolution at the level of each individual
ensemble member, within the framework of strong projective measurements. 
In this talk, we will show that weak postselected
measurements can distinguish these two types of evolution. An experimental 
protocol for determining the nature of quantum
collapse based on a simultaneous application of a weak and a strong 
measurement will be described, and the example of a hydrogen
atom will be analyzed in detail.


Link:
https://gravityserver.ipb.ac.rs/b/mar-ae0-f4q-qww


Best regards,
Maja Buric

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