Abstract
Intense, few-femtosecond pulse technology has enabled studies of the fastest vibrational relaxation processes. The hydrogen group vibrations can be imaged and manipulated using intense infrared pulses. Through numerical simulation, we demonstrate an example of ultrafast coherent control that could be effected with current experimental facilities, and observed using high-resolution time-of-flight spectroscopy. The proposal is a pump-probe-type technique to manipulate the D2+ ion with ultrashort pulse sequences. The simulations presented show that vibrational selection can be achieved through pulse delay. We find that the vibrational system can be purified to a two-level system thus realizing a vibrational qubit. A novel scheme for the selective transfer of population between these two levels, based on a Raman process and conditioned upon the delay time of a second control-pulse is outlined, and may enable quantum encoding with this system.
Highlights
The physical processes in intense-field pump-probe experiments [1]–[9] on the deuterium molecule, can be summarized in the following reaction expressions:
Provided the delay is short with respect to the rotational period (Trot ∼ 350 fs), the orientation of the molecular ion will remain approximately parallel to the polarization direction of the second pulse, and the dissociation fragments will be, predominantly, ejected along the laser polarization direction [7, 8]
The goal of ultrafast coherent control is close at hand with the developments in ultrashortpulse lasers
Summary
The physical processes in intense-field pump-probe experiments [1]–[9] on the deuterium molecule, can be summarized in the following reaction expressions:. Provided the delay is short with respect to the rotational period (Trot ∼ 350 fs), the orientation of the molecular ion will remain approximately parallel to the polarization direction of the second (control) pulse, and the dissociation fragments will be, predominantly, ejected along the laser polarization direction [7, 8]. Under such conditions, the nuclear dynamics can be effectively modelled as a one-dimensional (1D) system.
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