title: Realization of the CNOT quantum gate operation in six-dimensional ammonia using the OCT-MCTDH approach.
abstract: Comparative studies of implementations of the controlled NOT quantum gate operation using vibrational states of ammonia as the qubit states are presented. The quantum gate operations are realized using tailored laser pulses, which are calculated using a combined approach of optimal control theory and the multiconfiguration time-dependent Hartree method. We compare results obtained with a reduced model of ammonia with three degrees of freedom (all N-H bond distances fixed) to those obtained with a full six-dimensional model. In our study, the optimal laser pulses of both models induce similar underlying physical mechanisms while the gate quality within the reduced model (>98%) is much higher than within the six-dimensional model (approximately 80%).
authors.affiliation: Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada. markus.schroeder@pci.uni-heidelberg.de
authors.forename: Markus
authors.initials: M
authors.lastname: Schröder
authors.forename: Alex
authors.initials: A
authors.lastname: Brown
mesh_terms: D000641:Ammonia / Q000737:chemistry*; D003198:Computer Simulation; D007834:Lasers; D008956:Models, Chemical; D011789:Quantum Theory; D013997:Time Factors; D014732:Vibration
chemical_list: D000641:Ammonia