Femtosecond Photoionization of Atoms under Noise

Abstract

We investigate the effect of incoherent perturbations on atomic photoionization due to a femtosecond mid-infrared laser pulse by solving the time-dependent stochastic Schrödinger equation. For a weak laser pulse which causes almost no ionization, an addition of a Gaussian white noise to the pulse leads to a significantly enhanced ionization probability. Tuning the noise level, a stochastic resonance-like curve is observed showing the existence of an optimum noise for a given laser pulse. Besides studying the sensitivity of the obtained enhancement curve on the pulse parameters, such as the pulse duration and peak amplitude, we suggest that experimentally realizable broadband chaotic light can also be used instead of the white noise to observe similar features. The underlying enhancement mechanism is analyzed in the frequency-domain by computing a frequency-resolved atomic gain profile, as well as in the time-domain by controlling the relative delay between the action of the laser pulse and noise.

10 pages, 10 figures

References in corpus (4)

• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Coherent Signal Amplification in Bistable Nanomechanical Oscillators by Stochastic Resonance
• Teaching the Environment to Control Quantum Systems
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Cited by in corpus (4)

• Optimal State Manipulation for a Two-Qubit System Driven by Coherent and Incoherent Controls
• Optimal control for state preparation in two-qubit open quantum systems driven by coherent and incoherent controls via GRAPE approach
• Femtosecond Photodissociation of Molecules Facilitated by Noise
• Dissociation and ionization of small molecules steered by external noise