## Abstract

A description of quantum systems at the time interval between two successive measurements is presented. Two wave functions, the first preselected by the initial measurement and the second post-selected by the final measurement describe quantum systems at a single time. It is shown how this approach leads to a new concept: a weak value of an observable. Weak values represent novel characteristics of quantum systems between two measurements. They are outcomes of a standard measuring procedure that fulfills certain requirements of "weakness". We call it weak measurement. Physical meaning and underlying mathematical structure of weak measurements are explored.

Original language | English |
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Pages (from-to) | 85-92 |

Number of pages | 8 |

Journal | Physica Scripta |

Volume | 76 |

State | Published - 1998 |