PIRSA:08090071 Conference Quantum Foundations

DOI10.48660/08090071

Conference/School: The Clock and the Quantum: Time and Quantum Foundations - 2008

Steinberg, A. (2008). Thinking Inside the Box: Weakly Measuring Postselected Ensembles. Perimeter Institute. https://pirsa.org/08090071

Steinberg, Aephraim. Thinking Inside the Box: Weakly Measuring Postselected Ensembles. Perimeter Institute, Sep. 29, 2008, https://pirsa.org/08090071 

@misc{ pirsa_PIRSA:08090071,
  doi = {10.48660/08090071},
  url = {https://pirsa.org/08090071},
  author = {Steinberg, Aephraim},
  keywords = {Quantum Foundations},
  language = {en},
  title = {Thinking Inside the Box: Weakly Measuring Postselected Ensembles},
  publisher = {Perimeter Institute},
  year = {2008},
  month = {sep},
  note = {PIRSA:08090071 see, \url{https://pirsa.org}}
}

Abstract

The presumed irreversibility of quantum measurements (whatever they are) leads, in conventional approaches to quantum theory, to an asymmetry between state preparation and post-selection. Is it possible that a trajectory can be predicted from the former, yet not inferred from the latter? Especially in light of the exciting applications of non-unitary operations (i.e., postselection) in quantum information, it becomes timely to reconsider how much one can say about a post-selected subensemble. I will review the weak-measurement formalism of Aharonov, Vaidman et al., and discuss some applications and extensions. These will include a proposed experiment to study the duration of the tunneling process (a question controversial since the 1930s) and a recently completed experiment aiming to \'resolve\' Hardy\'s retrodiction paradox.

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