Observing the quantum Cheshire cat with a nondestructive weak measuring device

Yosep Kim, Dong Gil Im, Yong Su Kim, Sang Yun Lee, Sang Wook Han, Sung Moon, Yoon Ho Kim, Young Wook Cho

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Observing counterintuitive quantum phenomena have provided physical perspectives on quantum mechanics as well as important evidence of its validity. One of such phenomena, namely the quantum Cheshire cat effect, illustrates the situation that the physical property is disembodied from its physical carrier. Here, we experimentally demonstrate the quantum Cheshire cat effect with a nondestructive weak measuring device. A pre- and post-selected photonic quantum system is subject to a weak nondestructive measuring device to probe where the photon and its polarization property can be found. Intriguingly, a quantum pointer after the weak quantum measurement indicates that the polarization can be found at the path the photon did not take.

Original languageEnglish
Title of host publicationCLEO
Subtitle of host publicationApplications and Technology, CLEO_AT 2019
PublisherOptica Publishing Group (formerly OSA)
ISBN (Print)9781943580576
Publication statusPublished - 2019
EventCLEO: Applications and Technology, CLEO_AT 2019 - San Jose, United States
Duration: 2019 May 52019 May 10

Publication series

NameOptics InfoBase Conference Papers
VolumePart F127-CLEO_AT 2019
ISSN (Electronic)2162-2701


ConferenceCLEO: Applications and Technology, CLEO_AT 2019
Country/TerritoryUnited States
CitySan Jose

Bibliographical note

Publisher Copyright:
© 2019 The Author(s)

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials


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