TY - JOUR
T1 - Selective creation of maximum coherence in multi-level Λ system
AU - Kumar, Praveen
AU - Malinovskaya, Svetlana A.
AU - Sola, Ignacio R.
AU - Malinovsky, Vladimir S.
PY - 2014/2/16
Y1 - 2014/2/16
N2 - We consider the creation of the maximum Raman coherence in the six-level Λ system using optimal control theory. Optimal fields are designed for different initial conditions, resonant, and off-resonant, using the Krotov method including a reference field into the cost functional. Suppression of the population transfer to the intermediate level is achieved via an additional functional constraint which depends on the system dynamics. We demonstrate that the spectrum of the optimised fields has major contribution from the corresponding resonant frequencies independently of the choice of carrier frequency of the initial guess field. We also indicate that the pulse train emerges as a solution of the control problem of coherence optimisation in multi-level quantum systems.
AB - We consider the creation of the maximum Raman coherence in the six-level Λ system using optimal control theory. Optimal fields are designed for different initial conditions, resonant, and off-resonant, using the Krotov method including a reference field into the cost functional. Suppression of the population transfer to the intermediate level is achieved via an additional functional constraint which depends on the system dynamics. We demonstrate that the spectrum of the optimised fields has major contribution from the corresponding resonant frequencies independently of the choice of carrier frequency of the initial guess field. We also indicate that the pulse train emerges as a solution of the control problem of coherence optimisation in multi-level quantum systems.
KW - Coherent population transfer
KW - Optimal control theory
KW - Pulse train
KW - Raman coherence
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U2 - 10.1080/00268976.2013.809166
DO - 10.1080/00268976.2013.809166
M3 - Article
AN - SCOPUS:84893825365
SN - 0026-8976
VL - 112
SP - 326
EP - 331
JO - Molecular Physics
JF - Molecular Physics
IS - 3-4
ER -