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Geometric phases in qubit-oscillator system beyond conventional rotating-wave approximation

王月明, 杜冠, 梁九卿

中国物理B：英文版Jan 1, 20120 citations

Sharp Tunneling Peaks in a Parametric Oscillator: Quantum Resonances Missing in the Rotating Wave Approximation

Vittorio Peano, Michael Marthaler, M. I. Dykman

We describe a new mechanism of tunneling between period-two vibrational states of a weakly nonlinear, parametrically modulated oscillator. The tunneling results from resonant transitions induced by the fast oscillating terms conventionally disregarded in the rotating wave approximation (RWA). The tunneling amplitude displays resonant peaks as a function of the modulation frequency; near the maxima it is exponentially larger than the RWA tunneling amplitude.

arXiv:1203.4803Physical Review LettersAug 27, 201220 citations

Quantum crossover of the switching rate of a modulated oscillator

Vittorio Peano, Lingzhen Guo, Michael Marthaler +2 more

Bulletin of the American Physical SocietyFeb 27, 20120 citations

Frequency-modulated few-cycle optical-pulse-train-induced controllable ultrafast coherent population oscillations in two-level atomic systems

Parvendra Kumar, Amarendra K. Sarma

We report a study on the ultrafast coherent population oscillations (UCPOs) in two-level atoms induced by a frequency-modulated few-cycle optical pulse train. The phenomenon of UCPOs is investigated by numerically solving the optical Bloch equations beyond the rotating wave approximation. We demonstrate that the quantum state of the atoms and the frequency of the UCPOs may be controlled by controlling the number of pulses in the pulse trains and the pulse repetition time, respectively. Moreover, the robustness of the population inversion against the variation of the laser pulse parameters is also investigated. The proposed scheme may be useful for the creation of atoms in selected quantum states for desired time duration and may have potential applications in ultrafast optical switching. The scheme may also be used to measure pulse repetition rate.We report a study on the ultrafast coherent population oscillations (UCPOs) in two-level atoms induced by a frequency-modulated few-cycle optical pulse train. The phenomenon of UCPOs is investigated by numerically solving the optical Bloch equations beyond the rotating wave approximation. We demonstrate that the quantum state of the atoms and the frequency of the UCPOs may be controlled by controlling the number of pulses in the pulse trains and the pulse repetition time, respectively. Moreover, the robustness of the population inversion against the variation of the laser pulse parameters is also investigated. The proposed scheme may be useful for the creation of atoms in selected quantum states for desired time duration and may have potential applications in ultrafast optical switching. The scheme may also be used to measure pulse repetition rate.

arXiv:1207.6701Physical Review AFeb 1, 201313 citations

Observable most probable trajectories of quantum switching in modulated oscillator

Vittorio Peano, M. I. Dykman

Bulletin of the American Physical SocietyMar 3, 20140 citations

Quantum Oscillators: General Considerations

Elsevier eBooksJan 1, 19950 citations

Switching in modulated quantum oscillators beyond the rotating wave approximation.

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