Anomalous weak values via a single photon detection

Enrico Rebufello; Fabrizio Piacentini; Alessio Avella; Muriel A. de Souza; Marco Gramegna; Jan Dziewior; Eliahu Cohen; Lev Vaidman; Ivo Pietro Degiovanni; Marco Genovese

doi:10.1038/s41377-021-00539-0

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Anomalous weak values via a single photon detection

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- Anomalous weak values via a single photon detection
- Anomalous weak values via a single photon detection
- LSA 2021年10卷第6期页码：963-968
- Affiliations：
  
  1.INRIM, Strada delle Cacce 91, I-10135 Torino, Italy
  2.National Institute of Metrology, Quality and Technology—INMETRO, Av. Nossa Senhora das Graças, 50, Duque de Caxias, RJ 25250-020, Brazil
  3.Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany
  4.Department für Physik, Ludwig-Maximilians-Universität, 80797 München, Germany
  5.Faculty of Engineering and the Institute of Nanotechnology and Advanced Materials, Bar Ilan University, Ramat Gan 5290002, Israel
  6.Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, TelAviv 6997801, Israel
- Author bio：
  
  Fabrizio Piacentini (f.piacentini@inrim.it)
- Funds：
- DOI：10.1038/s41377-021-00539-0
  中图分类号：
- 纸质出版日期：2021-06-30，
  
  网络出版日期：2021-05-25，
  
  收稿日期：2020-10-09，
  
  修回日期：2021-04-07，
  
  录用日期：2021-04-19
- Accepted：
Scan QR Code
Anomalous weak values via a single photon detection[J]. LSA, 2021,10(6):963-968.

Rebufello, E. et al. Anomalous weak values via a single photon detection. Light: Science & Applications, 10, 963-968 (2021).
Anomalous weak values via a single photon detection[J]. LSA, 2021,10(6):963-968. DOI： 10.1038/s41377-021-00539-0.

Rebufello, E. et al. Anomalous weak values via a single photon detection. Light: Science & Applications, 10, 963-968 (2021). DOI： 10.1038/s41377-021-00539-0.

摘要

Abstract

Is it possible that a measurement of a spin component of a spin-1/2 particle yields the value 100? In 1988 Aharonov

Albert and Vaidman argued that upon pre- and postselection of particular spin states

weakening the coupling of a standard measurement procedure ensures this paradoxical result

. This theoretical prediction

called

weak value

was realised in numerous experiments

2-9

but its meaning remains very controversial

10-19

since its "anomalous" nature

i.e.

the possibility to exceed the eige

nvalue spectrum

as well as its "quantumness" are debated

20-22

. We address these questions by presenting the first experiment measuring anomalous weak values with just a single click

without the need for statistical averaging. The measurement uncertainty is significantly smaller than the gap between the measured weak value and the nearest eigenvalue. Beyond clarifying the meaning of weak values

demonstrating their non-statistical

single-particle nature

this result represents a breakthrough in understanding the foundations of quantum measurement

showing unprecedented measurement capability for further applications of weak values to quantum photonics.

关键词

Keywords

references

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