A Dynamical Uncertainty Principle in von Neumann Algebras by Operator Monotone Functions |
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Authors: | Paolo Gibilisco Tommaso Isola |
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Affiliation: | (1) Dipartimento SEFEMEQ, Facoltà di Economia, Università di Roma “Tor Vergata”, Via Columbia 2, 00133 Rome, Italy;(2) Dipartimento di Matematica, Università di Roma “Tor Vergata”, Via della Ricerca Scientifica, 00133 Rome, Italy |
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Abstract: | Suppose that A 1,…,A N are observables (selfadjoint matrices) and ρ is a state (density matrix). In this case the standard uncertainty principle, proved by Robertson, gives a bound for the quantum generalized variance, namely for det {Cov ρ (A j ,A k )}, using the commutators [A j ,A k ]; this bound is trivial when N is odd. Recently a different inequality of Robertson-type has been proved by the authors with the help of the theory of operator monotone functions. In this case the bound makes use of the commutators [ρ,A j ] and is non-trivial for any N. In the present paper we generalize this new result to the von Neumann algebra case. Nevertheless the proof appears to simplify all the existing ones. |
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Keywords: | Uncertainty principle Operator monotone function Quantum Fisher information |
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