Does the Zeno effect freeze all the commuting observables?

[Heidi]

Hi Pfs
Take a two level system up-down in its up level, There are other observables that commute
with that. is it true that applying the Zeno's effect by fast repeated measure of that
observable will also freeze the system on up?
thanks.

 

[DrClaude]

Hi Pfs
Take a two level system up-down in its up level, There are other observables that commute
with that. is it true that applying the Zeno's effect by fast repeated measure of that
observable will also freeze the system on up?
thanks.

It depends on the state of the system. If the state can be separated into a product state of each observable, then measuring one observable will not affect the other. However, of the state cannot be separated like that, then measuring one is equivalent to measuring the other, and the Zeno effect can freeze the other observable.