Physics – Quantum Physics
Scientific paper
2009-10-08
J. Phys. A: Math. Theor. 42 No 27 (10 July 2009) 275303 (9pp)
Physics
Quantum Physics
Scientific paper
10.1088/1751-8113/42/27/275303
This paper considers the control landscape of quantum transitions in multi-qubit systems driven by unitary transformations with single-qubit interaction terms. The two-qubit case is fully analyzed to reveal the features of the landscape including the nature of the absolute maximum and minimum, the saddle points and the absence of traps. The results permit calculating the Schmidt state starting from an arbitrary two-qubit state following the local gradient flow. The analysis of multi-qubit systems is more challenging, but the generalized Schmidt states may also be located by following the local gradient flow. Finally, we show the relation between the generalized Schmidt states and the entanglement measure based on the Bures distance.
Cabrera Renan
Rabitz Herschel
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