Robust two-level system control by a detuned and chirped laser pulse

Abstract

We propose and demonstrate a robust control scheme by ultrafast nonadiabatic chirped laser pulse, designed for targeting coherent superpositions of two-level systems. Robustness against power fluctuation is proved by our numerical study and a proof-of-principle experiment performed with femtosecond laser interaction on cold atoms. They exhibit for the final driven dynamics a cusp on the Bloch sphere, corresponding to a zero curvature of fidelity. This solution is particularly simple and thus applicable to a wide range of potential applications.Comment: 5 pages. 4 figure

Stimulated Raman adiabatic passage: Effects of system parameters on population transfer

“…The population transfer by an adiabatic passage is an important and prominent approach in quantum control [1][2][3][4]. Frequency-chirped laser [5][6][7], Landau-Zener technique [8][9][10], and a hosseini@sutech.ac.ir Stimulated Raman Adiabatic Passage (SRIRAP) [11][12][13][14][15][16][17] are some of the important methods of the adiabatic population transfer of the quantum systems.…”

Chirped Laser Pulse Effect on a Quantum Linear Oscillator

“…Along with the amplitude, carrier frequency, and pulse duration, an important parameter is the frequency chirp of the pulse. In papers [2][3][4][5][6], the features of excitation of a two-level system by chirped laser pulses were investigated. In work [2], the dependence of the population of the upper level of the quantum system on the chirp was calculated numerically and analytically for various values of the pulse duration and field amplitude.…”

“…In particular, it was shown that in a certain range of parameters, the populations of a two-level system can be effectively controlled by variation of the chirp. In article [3], an effective scheme for controlling the superposition state of a two-level system using an ultrashort chirped laser pulse was proposed. In work [4], a high-precision population transfer was studied in a two-level model using a chirped Gaussian pulse.…”

Investigation of robust population transfer using quadratically chirped laser interacting with a two-level system

“…In addition, significant population transfer can be achieved using the chirped (or frequency-swept) pulse laser [28][29][30][31][32][33][34][35][36]37]. Raman Chirped Adiabatic Passage (RCAP) is another method of population transfer based on adiabatic passage [38,39].…”