Deterministic minimum disturbance quantum measurement

So Young Baek, Yong Wook Cheong, Yoon Ho Kim

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


We demonstrate a linear optical device which performs optimal quantum measurement or minimum disturbance measurement on a single-photon polarization qubit with the help of an ancillary path qubit introduced to the same photon. We show theoretically and experimentally that this device satisfies the minimum disturbance measurement condition by investigating the relation between the information gain (estimation fidelity) and the state disturbance due to measurement (operation fidelity). Our implementation of minimal disturbance measurement is postselection-free in the sense that all detection events are counted toward evaluation of the estimation fidelity and the operation fidelity, i.e., there is no need for coincidence postselection of the detection events.

Original languageEnglish
Title of host publicationQuantum Communications and Quantum Imaging VI
Publication statusPublished - 2008
EventQuantum Communications and Quantum Imaging VI - San Diego, CA, United States
Duration: 2008 Aug 122008 Aug 14

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceQuantum Communications and Quantum Imaging VI
Country/TerritoryUnited States
CitySan Diego, CA


  • Minimum disturbance measurement
  • Quantum communication
  • Quantum measurement
  • Uncertainty relation


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