## Abstract

The simplest weak measurement is of a component of spin 1/2. For this observable, the probability distributions of the real and imaginary parts of the weak value, and their joint probability distribution, are calculated exactly for pre- and postselected states uniformly distributed over the surface of the Poincare-Bloch sphere. The superweak probability, that the real part of the weak value lies outside the spectral range, is 1/3. This case, with just two eigenvalues, complements our previous calculation (Berry and Shukla 2010 J. Phys. A: Math. Theor. 43 354024) of the universal form of the weak value probability distribution for an operator with many eigenvalues.

Original language | English |
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Article number | 205301 |

Pages (from-to) | - |

Number of pages | 8 |

Journal | Journal of Physics A: Mathematical and Theoretical |

Volume | 44 |

Issue number | 20 |

DOIs | |

Publication status | Published - 20 May 2011 |