A single particle uncertainty relation

Details A single particle uncertainty relation A single particle uncertainty relation

2003-03-02

arxiv.org/abs/quant-ph/0303005v6

Acta Physica Polonica B 39 (2008) 587-597

Physics

Quantum Physics

5 pages, 1 figure, revtex4, title changed

Scientific paper

We consider successive measurements of position and momentum of a single particle. Let P be the conditional probability to measure the momentum k with precision dk, given a previously successful position measurement q with precision dq. Several upper bounds for the probability P are determined. For arbitrary, but given precision dq, dk, these bounds refer to the variation of q, k and the state vector of the particle. A weak bound is given by the inequality P <= dkdq/h, where h is Planck's quantum of action. It is non-trivial for all measurements with dkdq < h. A sharper bound is obtained by applying the Hilbert-Schmidt-norm. As our main result the least upper bound of P is determined. All bounds are independent of the order with which the measuring of position and momentum is made.

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