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Creation of coherent atomic superpositions by fractional STIRAP | | N. V. Vitanov
; K.-A. Suominen
; B. W. Shore
; | | Date: |
27 Nov 1998 | | Subject: | quant-ph | | Abstract: | We discuss a simple scheme for preparing atoms and molecules in an arbitrary preselected coherent superposition of quantum states. The technique, which we call fractional stimulated Raman adiabatic passage ({it f-STIRAP}), is based upon (incomplete) adiabatic population transfer between an initial state $psi_1$ and state $psi_3$ through an intermediate state $psi_2$. As in STIRAP, the Stokes pulse arrives before the pump pulse, but unlike STIRAP, the two pulses terminate simultaneously while maintaining a constant ratio of amplitudes. The independence of f-STIRAP from details of pulse shape and pulse area makes it the analog of conventional STIRAP in the creation of coherent superpositions of states. We suggest a smooth realization of f-STIRAP which requires only two laser pulses (which can be derived from a single laser) and at the same time ensures the automatic fulfillment of the asymptotic conditions at early and late times. Furthermore, we provide simple analytic estimates of the robustness of f-STIRAP against variations in the pulse intensity, the pulse delay, and the intermediate-state detuning, and discuss its possible extension to multistate systems. | | Source: | arXiv, quant-ph/9811079 | | Services: | Forum | Review | PDF | Favorites | |
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