NOT gate in a cis-trans photoisomerization model

M. Ndong, L. Bomble, D. Sugny, Y. Justum, and M. Desouter-Lecomte
Phys. Rev. A 76, 043424 – Published 30 October 2007

Abstract

We numerically study the implementation of a NOT gate by laser pulses in a model molecular system presenting two electronic surfaces coupled by nonadiabatic interactions. The two states of the bit are the fundamental states of the cis-trans isomers of the molecule. The gate is classical in the sense that it involves a one-qubit flip so that the encoding of the outputs is based on population analysis which does not take the phases into account. This gate can also be viewed as a double photoswitch process with the property that the same electric field controls the two isomerizations. As an example, we consider one-dimensional cuts in a model of the retinal in rhodopsin already proposed in the literature. The laser pulses are computed by the multitarget optimal control theory with chirped pulses as trial fields. Very high fidelities are obtained. We also examine the stability of the control when the system is coupled to a bath of oscillators modeled by an ohmic spectral density. The bath correlation time scale being smaller than the pulse duration, the dynamics is carried out in the Markovian approximation

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  • Received 11 July 2007

DOI:https://doi.org/10.1103/PhysRevA.76.043424

©2007 American Physical Society

Authors & Affiliations

M. Ndong1,2, L. Bomble1,2, D. Sugny3, Y. Justum1,2, and M. Desouter-Lecomte1,2,4,*

  • 1Université de Paris-Sud, Laboratoire de Chimie Physique, UMR8000, Orsay, F-91405, France
  • 2CNRS, Laboratoire de Chimie Physique, UMR8000, Orsay, F-91405, France
  • 3Institut Carnot de Bourgogne, Unité Mixte de Recherches 5027 CNRS et Université de Bourgogne, BP 47870, 21078 Dijon, France
  • 4Département de Chimie, Université de Liège, Institut de Chimie B6, Sart-Tilman, B-4000, Liège 1, Belgium

  • *Corresponding author. mdesoute@lcp.u-psud.fr

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Issue

Vol. 76, Iss. 4 — October 2007

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