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This video www.youtube.com/watch?v=j5HyMNNSGqQ and the paper it refers to https://www.nature.com/articles/s41586-019-1287-z
(available also at : http://qulab.eng.yale.edu/documents/papers/zlatko_paper.pdf )
... talks about how a quantum transition can be monitored and manipulated in real time. A couple of questions came to mind:
[1] The reported experiment involves an energy level transition. Is it possible to monitor and manipulate other kinds of states that don't involve energy jumps, like photon polarization or electron spin? For example, as an electron makes its way between the poles of a Stern-Gerlach magnet, can we (at least in principle) monitor and sense that it's about to head upwards, and then coax it to go downwards instead --- using principles like weak measurement and quantum state control?
[2] If two experimenters apply these techniques to a pair of entangled particles, how would it play out? Would both of them be able to sense that it's about to head towards state |A> |B>, say? If yes, then what if one experimenter decided to intervene and reverse the process and push it towards |Not A> |Not B> ? Or would weak measurement (however weak) totally destroy the entanglement?
[3] Is it possible for energy transitions occurring in different places to be entangled with each other? Or is it the case that entanglement normally involves observables other than energy?
(available also at : http://qulab.eng.yale.edu/documents/papers/zlatko_paper.pdf )
... talks about how a quantum transition can be monitored and manipulated in real time. A couple of questions came to mind:
[1] The reported experiment involves an energy level transition. Is it possible to monitor and manipulate other kinds of states that don't involve energy jumps, like photon polarization or electron spin? For example, as an electron makes its way between the poles of a Stern-Gerlach magnet, can we (at least in principle) monitor and sense that it's about to head upwards, and then coax it to go downwards instead --- using principles like weak measurement and quantum state control?
[2] If two experimenters apply these techniques to a pair of entangled particles, how would it play out? Would both of them be able to sense that it's about to head towards state |A> |B>, say? If yes, then what if one experimenter decided to intervene and reverse the process and push it towards |Not A> |Not B> ? Or would weak measurement (however weak) totally destroy the entanglement?
[3] Is it possible for energy transitions occurring in different places to be entangled with each other? Or is it the case that entanglement normally involves observables other than energy?
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