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Science 27 July 2007:
Vol. 317. no. 5837, p. 453
DOI: 10.1126/science.1137032
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Technical Comments

Response to Comment on "Coherent Control of Retinal Isomerization in Bacteriorhodopsin"

Valentyn I. Prokhorenko,1 Andrea M. Nagy,1 Stephen A. Waschuk,2 Leonid S. Brown,2 Robert R. Birge,3 R. J. Dwayne Miller1*

Joffre attempts to show that the linear response of any quantum system to an external perturbation is phase insensitive, but he uses incorrect mathematical assumptions, misinterprets the time invariance principle, and ignores causality. We argue that the opposite case—an explicit phase dependence for a signal measured in the linear excitation regime—can equally be shown using Joffre's approach and assumptions.

1 Institute for Optical Sciences, Departments of Chemistry and Physics, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada.
2 Department of Physics, University of Guelph, Guelph, Ontario, N1G 2W1, Canada.
3 Department of Chemistry, University of Connecticut, Storrs, CT, USA.

* To whom correspondence should be addressed. E-mail: dmiller{at}lphys.chem.utoronto.ca

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