Design of optimal infrared femtosecond laser pulses for the overtone excitation in acetylene

Tesch, Carmen M.; Kompa, K. L.; Vivie‐Riedle, Regina de

doi:10.1016/s0301-0104(01)00222-1

Cited by 22 publications

(21 citation statements)

References 37 publications

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“…8,13,14 Because we are interested in quantum computing, we have to deal with the gate transformations of the vibrational qubit and such a problem is slightly more complex. Here i ϭ͉0͘ and f ϭ͉1͘.…”

Section: ͑3͒mentioning

confidence: 99%

Accuracy of gates in a quantum computer based on vibrational eigenstates

Babikov

2004

The Journal of Chemical Physics

107

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A model is developed to study the properties of a quantum computer that uses vibrational eigenstates of molecules to implement the quantum information bits and shaped laser pulses to apply the quantum logic gates. Particular emphasis of this study is on understanding how the different factors, such as properties of the molecule and of the pulse, can be used to affect the accuracy of quantum gates in such a system. Optimal control theory and numerical time-propagation of vibrational wave packets are employed to obtain the shaped pulses for the gates NOT and Hadamard transform. The effects of the anharmonicity parameter of the molecule, the target time of the pulse and of the penalty function are investigated. Influence of all these parameters on the accuracy of qubit transformations is observed and explained. It is shown that when all these parameters are carefully chosen the accuracy of quantum gates reaches 99.9%.

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Section: ͑3͒mentioning

confidence: 99%

Accuracy of gates in a quantum computer based on vibrational eigenstates

Babikov

2004

The Journal of Chemical Physics

107

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“…harmonic bonds) [10], but a trajectory that traverses a reaction barrier is sure to deviate from harmonic vibrational regimes. In experimental work, the excitation or cleavage of specific bonds [11,12], as well as the isomerization, dissociation, or ionization of molecules [13,14], have been demonstrated by feedback-based optimally controlled strong infrared pulses. Ultrafast IR pulses combined with UV photoexcitations have yielded selective bond breaking [15,16] as well as control over surface reactions [17,18], including agreement between modeling and experiments.…”

Section: Introductionmentioning

confidence: 99%

Coherent chemistry with THz pulses: Ultrafast field-driven isomerization of LiNC

Pellouchoud

Reed

2015

Phys. Rev. A

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The ability to coherently rearrange structures at the atomic scale is among the grand challenges of physical science. Some of the primary obstacles are non-adiabatic increases in energy, such as intramolecular vibrational relaxation (IVR) and electronic excitations. Motivated by recent advances in strong terahertz (THz) pulse generation, we investigate the potential of THz to circumvent these obstacles. Employing TDDFT-Ehrenfest simulations, we discover that strong THz pulses can drive isomerization of the LiNC molecule over barriers greater than 0.2 eV with very low ionization rates and, in the best case, less than 3 meV of residual excess energy. This work points to new potential to predictively manipulate chemical bonds in molecules and materials.

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“…13 An obvious drawback of C 2 H 2 as a candidate for vibrational QC is that it has a very large frequency separation between the two IR-active vibrational modes ͑727 and 3289 cm −1 ͒ used to encode the two qubits. The pioneering series of papers by Vivie-Riedle and co-workers 1,10-12 has focused on the gas phase H -C w C -H as a prototype molecule for a vibrational quantum computer.…”

Section: Introductionmentioning

confidence: 99%

Anharmonic properties of the vibrational quantum computer

Zhao

Babikov

2007

The Journal of Chemical Physics

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We developed an efficient approach to study the coherent control of vibrational state-to-state transitions. The approximations employed in our model are valid in the regime of the low vibrational excitation specific to the vibrational quantum computer. Using this approach we explored how the vibrational properties of a two-qubit system affect the accuracy of subpicosecond quantum gates. The optimal control theory and numerical propagation of laser-driven vibrational wave packets were employed. The focus was on understanding the effect of the three anharmonicity parameters of the system. In the three-dimensional anharmonicity parameter space we identified several spots of high fidelity separated by low fidelity planar regions. The seemingly complicated picture is explained in terms of interferences between different state-to-state transitions. Very general analytic relationships between the anharmonicity parameters and the frequencies are derived to describe the observed features. Geometrically, these expressions represent planes in the three-dimensional anharmonicity parameter space. Results of this work should help to choose a suitable candidate molecule for the practical implementation of the vibrational two-qubit system.

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Design of optimal infrared femtosecond laser pulses for the overtone excitation in acetylene

Cited by 22 publications

References 37 publications

Accuracy of gates in a quantum computer based on vibrational eigenstates

Accuracy of gates in a quantum computer based on vibrational eigenstates

Coherent chemistry with THz pulses: Ultrafast field-driven isomerization of LiNC

Anharmonic properties of the vibrational quantum computer

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