Andrzej Jamiolkowski

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In this paper, we discuss the minimal number η of observables Q1,. .. , Qη, where expectation values at some time instants t1,. .. , tr determine the trajectory of a d-level quantum system (" qudit ") governed by the Gaus-sian semigroup Φ(t)ρ = 1 √ 2πt ∞ −∞ ds e −s 2 /(2t) e −iHs ρe iHs. We assume that the macroscopic information about the system in(More)
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