Generalized Bound on Quantum Dynamics: Efficiency of Unitary Transformations between Non-Hermitian States
- 10 April 1995
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 74 (15) , 2921-2924
- https://doi.org/10.1103/physrevlett.74.2921
Abstract
We report a general bound for the efficiency of polarization or coherence transfer between quantized states under unitary transformations. This bound is more general than the so-called universal bound on spin dynamics [O. W. Sørensen, J. Magn. Reson. 86, 435 (1990)] that applies only to transformations between Hermitian states. The new bound on transfer efficiency under unitary transformations between general non-Hermitian operators depends exclusively on the singular values of the matrix representations of these operators.Keywords
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