Full characterization of polarization states of light via direct measurement

Research output: Contribution to journalArticle

128 Citations (Scopus)

Abstract

Ascertaining the physical state of a system is vital in order to understand and predict its behaviour. However, due to their fragile nature, the direct observation of quantum states has, until recently, been elusive. Historically, determination of the quantum state has been performed indirectly through the use of tomography. We report on two experiments showing that an alternative approach can be used to determine the polarization quantum state in a simple, fast and general manner. The first experiment entails the direct measurement of the probability amplitudes describing pure polarization states of light, the first such measurement on a two-level system. The second experiment entails the direct measurement of the Dirac distribution (a phase-space quasi-probability distribution informationally equivalent to the density matrix), demonstrating that the direct measurement procedure is applicable to general (that is, potentially mixed) quantum states. Our work has applications to measurements in foundational quantum mechanics, quantum information and quantum metrology.
Original languageEnglish
Pages (from-to)316-321
JournalNature Photonics
Volume7
Issue number4
Early online date3 Mar 2013
DOIs
Publication statusPublished - Apr 2013

Fingerprint Dive into the research topics of 'Full characterization of polarization states of light via direct measurement'. Together they form a unique fingerprint.

  • Cite this