Abstract

We investigate the most energy-efficient way to transfer population in a three-level atom in the lambda configuration, under conditions of very strong coupling to a one-dimensional waveguide. We start with the ideal situation in which a single-photon pulse can yield a perfect transfer, through the process known as “single-photon Raman interaction,” and then consider how to improve the transfer probability by adding as few photons as possible when these ideal conditions are not met. We find that under a broad range of conditions, the failure probability can be made to decrease exponentially with the average number of photons in a coherent-state wavepacket. We also find that, in general, under these conditions, it is preferable to increase the number of photons in the single “pump” pulse than to add a second (“Stokes”) pulse on the second leg of the lambda configuration.

© 2020 Optical Society of America

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