2
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Jun 29, 2018
06/18
by
Ihar Babushkin
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We consider a qubit governed by a sequence of weak measurements, with the measurement strength modified in a time- and state-dependent manner. The resulting trajectory of the qubit in the phase space can be weakly controlled without any direct action on the qubit (control-free control), even only one fixed observable is measured. Here we show a possibility of a weak form of a stochastic ratchet, allowing to create an additional "force" without changing the corresponding effective...
Topic: Quantum Physics
Source: http://arxiv.org/abs/1601.08022
2
2.0
Jun 30, 2018
06/18
by
Eduardo Cabrera-Granado; Yxing Chen; Ihar Babushkin; Luc Bergé; Stefan Skupin
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The spectrum of terahertz (THz) emission in gases via ionizing two-color femtosecond pulses is analyzed by means of a semi-analytic model and finite-difference-time-domain simulations in 1D and 2D geometries. We show that produced THz signals interact with free electron trajectories and thus influence significantly further THz generation upon propagation, i.e., make the process inherently nonlocal. This self-action plays a key role in the observed strong spectral broadening of the generated THz...
Topics: Physics, Plasma Physics, Optics
Source: http://arxiv.org/abs/1407.6893
96
96
Sep 23, 2013
09/13
by
Christian Köhler; Eduardo Cabrera-Granado; Ihar Babushkin; Luc Bergé; Joachim Herrmann; Stefan Skupin
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Forward and backward THz emission by ionizing two-color laser pulses in gas is investigated by means of a simple semi-analytical model based on Jefimenko's equation and rigorous Maxwell simulations in one and two dimensions. We find the emission in backward direction having a much smaller spectral bandwidth than in forward direction and explain this by interference effects. Forward THz radiation is generated predominantly at the ionization front and thus almost not affected by the opacity of...
Source: http://arxiv.org/abs/1105.3436v1
