Abstract
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 language | English (US) |
|---|---|
| Pages (from-to) | 2832-2835 |
| Number of pages | 4 |
| Journal | Physical review letters |
| Volume | 76 |
| Issue number | 16 |
| DOIs | |
| State | Published - Apr 15 1996 |
ASJC Scopus subject areas
- Physics and Astronomy(all)