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Physical Review A

Complete population transfer between nonresonant tunneling states induced by a train of laser pulses

Noriaki Tsukada, Y. Nomura, Toshiro Isu

Published Apr 1, 1999• 8 citations
Publisher

Abstract

Complete population transfer between nonresonant tunneling states in a double-well system is predicted to occur when a train of bright or dark laser pulses drives transitions to an excited state in the system. The transition induces the phase shift of the wave packet involved in the transition and alters successive evolutions of the wave packets of the nonresonant states as a result of quantum interference, resulting in complete tunneling.

DOI
10.1103/physreva.59.2852

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Complete population transfer between nonresonant tunneling states in a double-well system is predicted to occur when a train of bright or dark laser pulses drives transitions to an excited state in the system. The transition induces the phase shift of the wave packet involved in the transition and alters successive evolutions of the wave packets of the nonresonant states as a result of quantum interference, resulting in complete tunneling.
Summary form only given. Dynamical control of the atomic tunneling between two Bose-Einstein condensates (BEC's) confined in a double-well potential is predicted to occur when laser pulses induce transition between one of the condensate state and the excited state which brings about phase shifts for the condensate wave function, leading to transition between macroscopic quantum self-trapping, which is a self-maintained population imbalance between two BEC's due to interatomic interaction, and large amplitude oscillations. We investigate this phenomenon for the case of a three-level system with two condensate states and an excited state.
The suppression of Quantum Dynamical tunneling is predicted to occur when a laser field drives a transition in an isolated,single molecule embedded in a host medium.A externalforce having quasiresont frequency drives trasitions between the ground and excited states,which forms a Λ-type systerm.Through dressed state analysis,dark and bright representation analysis and some approximation,the solution is gained.Dark and bright representation analysis is a physical interpretation;in some condition,particles can be completely localized in one well or be localized in lower doublet.
We revisit the problem of laser-induced suppression of quantum dynamical tunneling in a model system studied by Kilin et al. [Phys. Rev. Lett. 76 (1996) 3297]. This quantum system consists of a ground state symmetric double-well potential which is coupled by a strong laser field to an excited state asymmetric double-well potential. By analyzing the assumptions used in their analysis we show that the suppression of quantum dynamical tunneling can be explained with the use of dark and bright states of the system. We also generalize the system and the conditions for suppression of quantum tunneling and show that, in certain cases, suppression can occur regardless the characteristics of the excited potential surface.
Abstract A scheme is proposed for coherent population transfer and creation of coherent superposition states assisted by one time-dependent tunneling pulse and one time-independent tunneling pulse in triple quantum dots. Time-dependent tunneling, which is similar to the Stokes laser pulse used in traditional stimulated Raman adiabatic passage, can lead to complete population transfer from the ground state to the indirect exciton states. Time-independent tunneling can also create double dark states, resulting in the distribution of the population and arbitrary coherent superposition states. Such a scheme can also be extended to multiple quantum dots assisted by one time-dependent tunneling pulse and more time-independent tunneling pulses.
A zero-area pulse produces no excitation in a two-state quantum system on exact resonance. We show analytically and numerically that off resonance the transition probability may acquire significant values, and as the Rabi frequency increases, it approaches steadily unity, a feature reminiscent of adiabatic passage. The nature of the transition is not, however, of adiabatic nature. We show that complete population transfer occurs as a result of a quasiresonant transition between the adiabatic states due to a $\ensuremath{\delta}$-function-type interaction with an area of $\ensuremath{\pi}$.
We theoretically study the interaction of two time delayed, phase-locked, and nonresonant pulses with a two-level system in the strong field regime. The population transfer is shown to be extremely sensitive to the phase shift $\ensuremath{\phi}$ between the pulses, with efficient population transfer taking place only for $\ensuremath{\phi}$ close to $\ensuremath{\pi}$. This effect is explained in terms of nonadiabatic jump and rapid adiabatic passage phenomena.