IMPOSSIBILITY OF MEASURING THE WAVE-FUNCTION OF A SINGLE QUANTUM SYSTEM

Authors
DARIANO GM YUEN HP
Citation
Gm. Dariano et Hp. Yuen, IMPOSSIBILITY OF MEASURING THE WAVE-FUNCTION OF A SINGLE QUANTUM SYSTEM, Physical review letters, 76(16), 1996, pp. 2832-2835
Citations number
17
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
76
Issue
16
Year of publication
1996
Pages
2832 - 2835
Database
ISI
SICI code
0031-9007(1996)76:16<2832:IOMTWO>2.0.ZU;2-1
Abstract
The general impossibility of determining the state of a single quantum system is proved for arbitrary measuring schemes, including a success ion of measurements. Some recently proposed methods are critically exa mined. A scheme for tomographic measurements on a single copy of a rad iation field is devised, showing that the system state is perturbed ho wever weak the system-apparatus interaction is, due to the need of pre paring the apparatus in a highly ''squeezed'' state.