Position measurements obeying momentum conservation.
نویسندگان
چکیده
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.
منابع مشابه
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ورودعنوان ژورنال:
- Physical review letters
دوره 106 11 شماره
صفحات -
تاریخ انتشار 2011