Zobrazeno 1 - 10
of 76
pro vyhledávání: '"J H McGuire"'
Publikováno v:
Journal of Physics B: Atomic, Molecular and Optical Physics. 39:1361-1378
Analytic solutions are developed for two-state systems (e.g. qubits) strongly perturbed by a series of rapidly changing pulses, called 'kicks'. The evolution matrix may be expressed as a time-ordered product of evolution matrices for single kicks. Si
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1b7119fb4c4e8c5c9f3e550b0b612824
https://doi.org/10.1088/0953-4075/39/6/009
https://doi.org/10.1088/0953-4075/39/6/009
Publikováno v:
Journal of Physics B: Atomic, Molecular and Optical Physics. 36:3145-3154
Analytic expressions have been found for transition probabilities in a degenerate n-level atom interacting with a strong external field that gives a common time dependence to all of the transition matrix elements. Except for solving a simple nth-orde
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0701109e7b144b235c5e740e2d127fc6
https://doi.org/10.1088/0953-4075/36/14/315
https://doi.org/10.1088/0953-4075/36/14/315
Autor:
Alexander Godunov, J. Hanni, V A Shipakov, Reinhard F. Bruch, J H McGuire, Hocine Merabet, Kh. Kh. Shakov
Publikováno v:
Journal of Physics B: Atomic, Molecular and Optical Physics. 36:209-216
Time ordering of interactions in dynamic quantum multi-electron systems provides a constraint that interconnects the time evolution of different electrons. In energy space, time ordering appears as the principal value contribution from the Green func
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6882dd0b10ea76c214819e06dddcbbd3
https://doi.org/10.1088/0953-4075/36/2/303
https://doi.org/10.1088/0953-4075/36/2/303
Autor:
P B Ivanov, J H McGuire, Kh. Kh. Shakov, V A Shipakov, Reinhard F. Bruch, Hocine Merabet, J. Hanni, Alexander Godunov
Publikováno v:
Journal of Physics B: Atomic, Molecular and Optical Physics. 34:5055-5069
Cross sections for ionization with excitation and for double excitation in helium are evaluated in a full second Born calculation. These full second Born calculations are compared to calculations in the independent electron approximation, where spati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4c3f55c293384cc073abc3f6d4186aee
https://doi.org/10.1088/0953-4075/34/24/308
https://doi.org/10.1088/0953-4075/34/24/308
Publikováno v:
Journal of Physics B: Atomic, Molecular and Optical Physics. 34:2575-2580
We report experimental and theoretical results for the magnetic sublevel population of the helium atom in collisions with fast (vi = 3-9 au) electrons and protons. Cross sections for excitation of magnetic sublevels with M = 0 and ±1 have been obtai
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::46dda8a19d9d91e35f1088c0883ee65c
https://doi.org/10.1088/0953-4075/34/13/303
https://doi.org/10.1088/0953-4075/34/13/303
Autor:
J H McGuire, Alexander Godunov
Publikováno v:
Journal of Physics B: Atomic, Molecular and Optical Physics. 34:L223-L229
We propose an independent time approximation (ITA), defined by simplifying the chronological operator, namely, TTunc, where Tunc is the uncorrelated limit of the chronological operator T. The concept of the time correlation is analogous to spatial el
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b451153ad65cb25d5ddcfc9dd8104484
https://doi.org/10.1088/0953-4075/34/7/104
https://doi.org/10.1088/0953-4075/34/7/104
Publikováno v:
Physical Review A. 58:2148-2159
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::498aabdbcebf6a77cf4f9699360c2427
https://doi.org/10.1103/physreva.58.2148
https://doi.org/10.1103/physreva.58.2148
We obtain an expression for the matrix element for a twisted (Laguerre-Gaussian profile) photon scattering from a hydrogen atom. We consider photons incoming with an orbital angular momentum (OAM) of $\ell \hbar$, carried by a factor of $e^{i \ell \p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7d7eae26d632b01603329ef54436fac5
Autor:
J. H. McGuire
Publikováno v:
Lecture Notes in Physics ISBN: 9783540187325
Here we have considered various two electron processes in atomic collisions. We have suggested and used a definition of the few body concept of correlation where screening is not considered to be correlation, but a change of screening is considered t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d348d35ee08160ae816023ef5d775cf9
https://doi.org/10.1007/3-540-18732-4_135
https://doi.org/10.1007/3-540-18732-4_135
We examine time ordering effects in strongly, suddenly perturbed two-state quantum systems (kicked qubits) by comparing results with time ordering to results without time ordering. Simple analytic expressions are given for state occupation amplitudes
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d419de1be4680c05beafb69bb8453a91
http://arxiv.org/abs/quant-ph/0406177
http://arxiv.org/abs/quant-ph/0406177