Prof. Victor Zadkov
Last name: Zadkov
International Laser Center and Faculty of Physics
Current Research Interests
Victor Zadkov's current research interests are in the field of laser physics, interaction of laser radiation with matter, molecular dynamics of photoexcited molecules, coherent control, quantum optics and physics of quantum information. He is an author (co-author) of more than 180 scientific publications including a book (V.N.Zadkov, Yu.V.Ponomarev, Application of Computers in Physics Laboratory, Nauka Publishers, Moscow, 276 pp., 1988, in Russian) and several collections edited (see Publications).
Key Scientific Results
In physics of quantum information, basic quantum information measures involved in the information analysis of quantum systems are considered. It is shown that the main quantum information measurement methods depend on whether the corresponding quantum events are compatible or incompatible. For purely quantum channels, the coherent and compatible information measures, which are qualitatively different, can be distinguished. A general information scheme is proposed for a quantum-physical experiment. In this scheme, informational optimization of an experimental setup is formulated as a mathematical problem. The coherent information concept is used to analyze a variety of simple quantum systems (for the information decay in a two-level atom in the presence of an external resonant field, for the information exchange between two coupled two-level atoms, and for the information transfer from a two-level atom to another atom and to a photon field). The mathematical structure of superoperators describing quantum measurements, including entangling measurement--the generalization of a standard quantum measurement, which results in entanglement in the measurable system and apparatus--is examined. It is shown that the coherent information can be effectively used for analysis of such entangling measurements. Novel schemes for generation of entangled states, which involve only the lower states of the Lambda-system, not vulnerable to radiative decay, are proposed. Two of them employ coherent dynamics to achieve entanglement in the system, whereas the third one uses optical pumping, i.e., an essentially incoherent process. A new quantum cryptography protocol, based on all unselected states of a qubit as a sort of alphabet with continuous set of letters, is proposed. Its effectiveness is calculated and shown to be essentially higher than those of the other known protocols.
In spectroscopy of dark resonances, a novel type of multiplets in the resonance fluorescence from a biharmonically excited Lambda-system due to the FWM processes has been predicted theoretically. It has been shown also that the FWM processes intrinsically limit the coherence that can be maintained in the system and, therefore, the ultimate width of the dark or coherent population trapping (CPT) resonance. Theory of CPT-resonances for multilevel atomic structures is developed and spectra of samarium vapor in the presence and without magnetic field are analyzed.
In coherent spectroscopy and nonlinear optics, a theory of saturation effects in coherent Raman spectroscopy of molecular gases under motional narrowing condition was developed and first experimental registration of these effects was made in liquid nitrogen. A number of pioneering experiments on coherent anti-Stokes Raman spectroscopy (CARS) and photoacoustic Raman spectroscopy (PARS) were performed with molecular gases and plasma. Namely, it was discovered that laser-produced plasma exhibits strong nonlinear optical properties and can be used for frequency conversion, saturation of rotational transition in hydrogen molecules was studied by CARS and PARS techniques simultaneously, CARS was used as a highly sensitive technique to study highly excited polyatomic molecules (SF6 and others) and CARS was suggested to be a thermometry method for noncontact diagnostics, CARS was used to study shock waves, etc.
In nonlinear optics of chiral media, a problem of inducing a required sign of chirality in a racemic mixture of enantiomers of a chiral molecule is analyzed. As an example, a racemic mixture (vapor) of left- and right-handed enantiomers of hydrogen peroxide molecule is considered. A new scheme of laser coherent control of molecular chirality in a racemic mixture of chiral molecules employing quantum entanglement between rotational and chiral molecular degrees of freedom is proposed. It is shown that with the use of this scheme one can effectively manage preferential laser synthesis of a required enantiomer from a racemate of the chiral molecules.
In molecular dynamics, a new approach which couples classical molecular dynamics with quantum description of pulsed laser excitation of electronic degrees of freedom is applied to the intramolecular dynamics study of photoexcited molecules. This approach makes it possible to explore the dynamics of an excited molecule on a multidimensional potential energy surface with no constraints. As an example, photoinduced isomerization of cis-stilbene has been studied by quasiclassical molecular dynamics methods using surfaces that include all internal coordinates. The nonadiabatic dynamics leading to internal conversion and products formation was modeled using semiclassical surface-hopping method. Essentially nonstatistical features were found for the excited state dynamics. As an extension of our approach, we studied a physisorbed photoexcited stilbene molecule's dynamics, as well. Key result of our computer simulations is that local field of the substrate strongly affects molecule's dynamics. Nevertheless, photoisomerization dynamics features that are characteristic for an isolated molecule are preserved for physisorbed molecule, as well.
Victor Zadkov's teaching activities include teaching of General Physics for the 2nd and 3rd-year students of Computer Sciences and Cybernetics Department, Moscow State University, general course on Computer Physics for the 1st- and 2nd-year students of Physics, Physics Department, Moscow State University, and several specialized courses.
Victor Zadkov is a member of IEEE and SPIE. He is a member of the Scientific Councils of Moscow State University, Physics Faculty and International Laser Center of M.V.Lomonosov Moscow State University and a founding member of the International Academy of Laser Medicine and Surgery. In 2003 he was elected as a member of the Quantum Electronics Division/European Physical Society. Victor Zadkov serves as an editorial board member for Laser Medicine Journal, Computers in Physics series (Nauka Publishers, Moscow), and a scientific adviser of Physics Encyclopaedia (Russian Encyclopaedia Publishers, Moscow). He served also as a member of Organizing/Program Committees/Advisory Board member for many of International conferences, including International Conference on Coherent and Nonlinear Optics (ICONO, 1991-2001), International Conference on Laser Applications in Life Sciences (LALS, 1990-2002), International Quantum Electronics Conference (IQEC-2002), German-Russian Laser Symposium (GRLS, 1994-2002), French-Russian Laser Symposium (FRLS, 1998-2002), Akhmanov Laser Graduate School (Akhmanov LGS, 1991-2000), and others. In 1997 Victor Zadkov was a Humboldt fellow with Prof. Dieter Meschede, Institute of Applied Physics, University of Bonn, Bonn, Germany.
Honors and Awards
In 1984 Victor Zadkov was awarded by the Lenin Komsomol Prize in Physics (the highest award for young scientists in the Former Soviet Union).
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