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Reconstructing a pure state of a spin s through three Stern-Gerlach measurements

Jean-Pierre Amiet and Stefan Weigert

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Consider a spin s prepared in a pure state. It is shown that, generically, the moduli of the spin components along three directions in space determine the state unambiguously. These probabilities are accessible experimentally by means of a standard Stern-Gerlach apparatus. It is therefore possible to reconstruct a generic pure state on the basis of 6s independent measured intensities.


PACS

03.65.-w Quantum mechanics

MSC

81Qxx General mathematical topics and methods in quantum theory

Subjects

Quantum information and quantum mechanics

Dates

Issue 15 (16 April 1999)

Received 5 October 1998



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