Selective excitation in a three-state system using a hybrid adiabatic-nonadiabatic interaction

Abstract

The chirped-pulse interaction in the adiabatic coupling regime induces cyclic permutations of the energy states of a three-level system in the V -type configuration, which process is known as the three-level chirped rapid adiabatic passage. Here we show that a spectral hole in a chirped pulse can turn on and off one of the two adiabatic crossing points of this process, reducing the system to an effective two-level system. The given hybrid adiabatic-nonadiabatic transition results in selective excitation of the three-level system, controlled by the laser intensity and spectral position of the hole as well as the sign of the chirp parameter. Experiments are performed with shaped femtosecond laser pulses and the three lowest energy-levels (5S 1/2 , 5P 1/2 , and 5P 3/2 ) of atomic rubidium ( 85 Rb), of which the result shows good agreement with the theoretically analyzed dynamics. The result indicates that our method, being combined with the ordinary chirped-RAP, implements an adiabatic transitions between the two excited states. Furthermore the laser intensity-dependent control may have applications including selective excitations of atoms or ions arranged in space when being used in conjunction with laser beam profile programming.

Single-laser-pulse implementation of arbitrary ZYZ rotations of an atomic qubit

“…The atoms were first excited by a π/2-area pulse to initialize the atoms in the superposition state |ψ init defined in Eq. (14). Then, the chirped pulse with a temporal hole rotated the state.…”

“…When atoms, in the initial superposition state |ψ init in Eq. (14), undergo the rotation in Eq. (10), the excited-state probability is given by…”

“…3). The detail of our laser experimental setup is described in our previous work [13,14]. Briefly, we used amplified optical pulses from a Ti:sapphire mode-locked laser.…”

Open multistate Majorana model

“…In fact, it was originally introduced by LZMS thinking of different physical scenarios, ranging from deformation of molecular orbitals to magnetic atoms in magnetic fields. Moreover, LZMS models has been proven to be relevant for example in quantum optics [11][12][13], in systems with two or more interacting qubits [14], in the physical scenario of artificial atoms [15,16] or in properly atomic systems [17]. Third, in the fully adiabatic limit, it allows for quantum state manipulation based on the adiabatic following of the Hamiltonian eigenstates.…”

Degenerate Landau–Zener model in the presence of quantum noise

“…Several other specific schemes involving many levels have been proposed and studied in details [21][22][23][24], as well as effective LZMS models able to describe the dynamics of spin-boson systems governed by the time-dependent Rabi Hamiltonian [25] or Tavis-Cummings model [26,27]. The interest in the LZMS model is witnessed by several experiments that have been developed with systems which are adiabatically or quasi-adiabatically driven in the proximity of avoided crossings [28][29][30].…”