Reconstruction of spin states and its conceptual implications

Details Reconstruction of spin states and its conceptual implications Reconstruction of spin states and its conceptual implications

1998-09-22

arxiv.org/abs/quant-ph/9809065v1

Physics

Quantum Physics

Latex2e, 9 pages

Scientific paper

State reconstruction for quantum spins is reviewed. Emphasis is on non-tomographic approaches which are based on measurements performed with a Stern-Gerlach apparatus. Two consequences of successfully implemented state reconstruction are pointed out. First, it allows one to determine experimentally the expectation value of an arbitrary operator without a device measuring it. Second, state reconstruction suggests a reformulation of Schroedinger's equation in terms of expectation values only, without explicit reference to a wave function or a density operator.

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