We present a hitherto unknown fundamental limitation to a basic measurement: that of the position of a quantum object when the total momentum of the object and apparatus is conserved. This result extends the famous Wigner-Araki-Yanase theorem, and shows that accurate position measurements are only practically feasible if there is a large momentum uncertainty in the apparatus.
|Number of pages||4|
|Journal||Physical Review Letters|
|Publication status||Published - 18 Mar 2011|
- Mathematical Physics