arXiv:1108.2671 · Physical Review A

Adiabatic passage in the presence of noise

T. Noel, Matthew Dietrich, Nathan Kurz, Gang Shu, J. Wright, B. B. Blinov

Published Feb 1, 2012• 24 citations

Abstract

We report on an experimental investigation of rapid adiabatic passage (RAP) in a trapped barium ion system. RAP is implemented on the transition from the $6{S}_{1/2}$ ground state to the metastable $5{D}_{5/2}$ level by applying a laser at 1.76 $\ensuremath{\mu}$m. We focus on the interplay of laser frequency noise and laser power in shaping the effectiveness of RAP, which is commonly assumed to be a robust tool for high-efficiency population transfer. However, we note that reaching high state transfer fidelity requires a combination of small laser linewidth and large Rabi frequency.

DOI: 10.1103/physreva.85.023401

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arXiv:1108.2671 · Physical Review A

Adiabatic passage in the presence of noise

T. Noel, Matthew Dietrich, Nathan Kurz, Gang Shu, J. Wright, B. B. Blinov

Published Feb 1, 2012• 24 citations

arXiv HTML PDF

Abstract

We report on an experimental investigation of rapid adiabatic passage (RAP) in a trapped barium ion system. RAP is implemented on the transition from the

6{S}_{1/2}

ground state to the metastable

5{D}_{5/2}

level by applying a laser at 1.76

\ensuremath{\mu}

m. We focus on the interplay of laser frequency noise and laser power in shaping the effectiveness of RAP, which is commonly assumed to be a robust tool for high-efficiency population transfer. However, we note that reaching high state transfer fidelity requires a combination of small laser linewidth and large Rabi frequency.

DOI: 10.1103/physreva.85.023401

Related papers

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C. Wunderlich, Th. Hannemann, T. Körber +5 more

arXiv:quant-ph/0508159Journal of Modern OpticsAug 21, 200671 citations

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Rekishu Yamazaki, Ken-ichi Kanda, Fumihiko Inoue +2 more

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Yunheung Song, Han-gyeol Lee, Hanlae Jo +1 more

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arXiv:2205.13688Physical Review AJul 18, 20237 citations

We report on an experimental investigation of rapid adiabatic passage (RAP) in a trapped barium ion system. RAP is implemented on the transition from the

6{S}_{1/2}

ground state to the metastable

5{D}_{5/2}

level by applying a laser at 1.76

\ensuremath{\mu}

We describe experimental results of the generation of superposition states in a two-level system,

4s\phantom{\rule{0.2em}{0ex}}{S}_{1∕2}

and

3d\phantom{\rule{0.2em}{0ex}}{D}_{5∕2}

states, of a single calcium ion. The generation method is based on population transfer via rapid adiabatic passage (RAP), proposed by Vitanov and Shore [Phys. Rev. A 73, 053402 (2006)]. The coherence of the generated superposition state is evaluated with a Ramsey-like interferometry method and a fringe visibility of up to 0.93 is obtained. The state generation shows strong robustness with respect to the RAP pulse parameters, including frequency chirp width and Rabi frequency.

{\text{Pr}}^{3+}\text{:}{\text{Y}}_{2}{\text{SiO}}_{5}

crystal. We perform systematic investigations of the efficiency of CAP and compare the results with conventional $\ensuremath{\pi}$ pulses and RAP. The data clearly demonstrate the superior features of CAP with regard to robustness and efficiency, even under conditions of weakly fulfilled adiabaticity. The experimental demonstration of composite sequences to support adiabatic passage is of significant relevance whenever a high efficiency or robustness of coherent excitation processes need to be maintained, e.g., as required in quantum information technology.

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 (RAP). Here we show that a spectral hole in a chirped pulse can turn on or off the level mixing at adiabatic crossing points of this process, reducing the system to an effective two-level system. The given hybrid adiabatic-nonadiabatic transition enables 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 performed with shaped femtosecond laser pulses and the three lowest energy levels (

5{S}_{1/2}

5{P}_{1/2}

, and

5{P}_{3/2}

) of atomic rubidium

(\mathrm{Rb})

show good agreement with the theoretically analyzed dynamics. The result indicates that our method, when being combined with the ordinary chirped RAP, implements an adiabatic transition between the Raman-coupled excited states. Furthermore, our 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.