Impossibility of measuring the wave function of a single quantum system

G. M. D’Ariano, H. P. Yuen

Research output: Contribution to journalArticlepeer-review

51 Scopus citations


The general impossibility of determining the state of a single quantum system is proved for arbitrary measuring schemes, including a succession of measurements.Some recently proposed methods are critically examined.A scheme for tomographic measurements on a single copy of a radiation field is devised, showing that the system state is perturbed however weak the system-apparatus interaction is, due to the need of preparing the apparatus in a highly “squeezed” state.

Original languageEnglish (US)
Pages (from-to)2832-2835
Number of pages4
JournalPhysical review letters
Issue number16
StatePublished - Apr 15 1996

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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