arXiv subjects

Bengt E Y Svensson

Publications and source records attributed to Bengt E Y Svensson.

2 recordsLinked to original sources

arXiv2014

Comments to Asking Photons Where They Have Been (A Danan et al, Phys. Rev. Lett. 111, 240402 (2013))

I critize some of the conclusions in the paper by Danan et al, in particular their claim that '(S)ome (of the photons) have been inside the nested interferometer ... but they never entered and never left (it) ...'. A standard quantum-mechanical analysis also casts doubts on their statement that '(o)nly the description with forward and backward evolving quantum states provides a simple and intuitive picture of pre- and postselected quantum particles.'

quant-ph↗

arXiv2013

What is a quantum-mechanical 'weak value' the value of?

A so called 'weak value' of an observable in quantum mechanics (QM) may be obtained in a weak measurement + post-selection procedure on the QM system under study. Applied to number operators, it has been invoked in revisiting some QM paradoxes (e.g., the so called Three Box paradox and Hardy s paradox). This requires the weak value to be interpreted as a bona fide property of the system considered, a par with entities like operator mean values and eigenvalues. I question such an interpretation; it has no support in the basic axioms of quantum mechanics and it leads to unreasonable results in concrete situations.

quant-ph↗