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Science 27 July 2007:
Vol. 317. no. 5837, p. 453
DOI: 10.1126/science.1137011
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Technical Comments

Comment on "Coherent Control of Retinal Isomerization in Bacteriorhodopsin"

Manuel Joffre1,2

Prokhorenko et al. (Research Articles, 1 September 2006, p. 1257) reported that, in the weak-field regime, the efficiency of retinal isomerization in bacteriorhodopsin can be controlled by modulating the spectral phase of the photoexcitation pulse. However, in the linear excitation regime, the signal measured in an experiment involving a time-invariant, stationary process can be shown to be independent of the pulse spectral phase.

1 Laboratoire d'Optique et Biosciences, Ecole Polytechnique, Centre National de la Recherche Scientifique, 91128 Palaiseau, France.
2 Institut National de la Santé et de la Recherche Médicale, U696, 91128 Palaiseau, France. E-mail: manuel.joffre{at}polytechnique.fr

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Science. ISSN 0036-8075 (print), 1095-9203 (online)