| 講演抄録／キーワード |
| 講演名 |
2023-05-30 15:20
Weak values and the past of a quantum particle
○Jonte R Hance（Hiroshima Univ.; Univ. of Bristol）・John G Rarity・James Ladyman（Univ. of Bristol） |
| 抄録 |
（和） |
We present three issues with using a nonzero weak value of the spatial projection operator to infer the past path of an individual quantum particle. First, weak measurements disturb a system, so any approach relying on these perturbations describes the state of a disturbed system, not the hypothetical undisturbed system. Secondly, even assuming no disturbance, there is no reason to associate this non-zero weak value with the classical idea of `particle presence'. Finally, these weak value approaches provide no information beyond standard quantum mechanics. We know of no experiment with testable consequences demonstrating connection between particle presence and weak values. |
| （英） |
We present three issues with using a nonzero weak value of the spatial projection operator to infer the past path of an individual quantum particle. First, weak measurements disturb a system, so any approach relying on these perturbations describes the state of a disturbed system, not the hypothetical undisturbed system. Secondly, even assuming no disturbance, there is no reason to associate this non-zero weak value with the classical idea of `particle presence'. Finally, these weak value approaches provide no information beyond standard quantum mechanics. We know of no experiment with testable consequences demonstrating connection between particle presence and weak values. |
| キーワード |
（和） |
weak values / quantum foundations / past of a quantum particle / weak measurement / / / / |
| （英） |
weak values / quantum foundations / past of a quantum particle / weak measurement / / / / |
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