| 1. |
- Adesso, Gerardo, et al.
(författare)
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Optical implementation and entanglement distribution in Gaussian valence bond states
- 2007
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Ingår i: Optics and Spectroscopy. - 0030-400X .- 1562-6911. ; 103:2, s. 178-186
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Tidskriftsartikel (refereegranskat)abstract
- We study Gaussian valence bond states of continuous variable systems, obtained as the outputs of projection operations from an ancillary space of M infinitely entangled bonds connecting neighboring sites, applied at each of $N$ sites of an harmonic chain. The entanglement distribution in Gaussian valence bond states can be controlled by varying the input amount of entanglement engineered in a (2M+1)-mode Gaussian state known as the building block, which is isomorphic to the projector applied at a given site. We show how this mechanism can be interpreted in terms of multiple entanglement swapping from the chain of ancillary bonds, through the building blocks. We provide optical schemes to produce bisymmetric three-mode Gaussian building blocks (which correspond to a single bond, M=1), and study the entanglement structure in the output Gaussian valence bond states. The usefulness of such states for quantum communication protocols with continuous variables, like telecloning and teleportation networks, is finally discussed.
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| 2. |
- Baryshnikov, G. V., et al.
(författare)
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Structure and Spectral Properties of Truxene Dye S5
- 2012
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Ingår i: Optics and Spectroscopy. - 0030-400X .- 1562-6911. ; 112:2, s. 168-174
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Tidskriftsartikel (refereegranskat)abstract
- On the ground of functional theory with the B3LYP and BMK functionals, we have studied the structure and optical properties of a truxene dye sensitizer S5 for photoelectric transducers. Based on the calculations of the vertical excitations energy of the dye molecule and accounting the influence of the solvent, we have revealed a positive solvatochromic effect that is weak compared to results obtained in the vacuum approximation. We have studied new features describing stabilization of the planar structure of the cyanothiophene-acrylic fragment of the S5 dye.
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| 3. |
- Baryshnikov, Glib V., et al.
(författare)
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The Electronic Structure and Spectra of Triphenylamines Functionalized by Phenylethynyl Groups
- 2018
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Ingår i: Optics and Spectroscopy. - : Pleiades Publishing. - 0030-400X .- 1562-6911. ; 124:1, s. 57-64
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Tidskriftsartikel (refereegranskat)abstract
- We study the features of the electronic structure and the IR, UV, and visible spectra of a series of triphenylamines substituted with phenylethynyl groups. The analysis is performed at the level of the density functional theory (DFT) and its nonstationary version in comparison with the experimental data of IR and electron spectroscopy. It is shown that, in the excited state, there is a change in the alternation of single, double, and triple bonds in accordance with the character of bonding and antibonding in the lowest vacant molecular orbital. The gradual introduction of additional phenylethynyl groups does not cause frequency shifts in the IR spectra of the molecules under study, but significantly affects the intensity of the corresponding IR bands. A similar effect is also observed in the electronic-absorption spectra of these compounds. This can be used for optical tuning of triphenylamines as promising materials for organic light-emitting diodes and solar cells.
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| 4. |
- Björk, Gunnar, et al.
(författare)
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Hilbert space factorization and partial measurements
- 2003
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Ingår i: Optics and Spectroscopy. - : Pleiades Publishing Ltd. - 0030-400X .- 1562-6911. ; 94:5, s. 695-699
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Tidskriftsartikel (refereegranskat)abstract
- A quantum system whose state vector belongs to a finite-dimensional Hilbert space is considered. If this space has a dimension that is a composite number, one can factor the space into a tensor product of subspaces. An observable that acts only in one of these subspaces is called a partial measurement. Some of the properties and the interpretation of such partial measurements are discussed.
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| 5. |
- Gerasimov, G. N., et al.
(författare)
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Parameters of VUV radiation from a DC capillary discharge in a mixture of krypton with xenon
- 2006
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Ingår i: Optics and Spectroscopy. - 0030-400X .- 1562-6911. ; 100:6, s. 825-829
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes the technique and the results of measurement of the power and geometry of the VUV radiation beam from a dc capillary discharge in a mixture of krypton and xenon. The angular divergence of narrowband VUV radiation of the heteronuclear KrXe* molecule is shown to be narrower as compared to that of the discharge radiation in the range 200-1000 nm. The power of VUV radiation from a discharge tube 80 cm long is found to exceed 10 mW.
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| 6. |
- Heydari, Hoshang, et al.
(författare)
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Entanglement measure for pure M circle times N bipartite quantum states
- 2005
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Ingår i: Optics and Spectroscopy. - : Pleiades Publishing Ltd. - 0030-400X .- 1562-6911. ; 99:3, s. 379-385
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Tidskriftsartikel (refereegranskat)abstract
- We propose an entanglement measure for pure M circle times N bipartite quantum states. We obtain the measure by generalizing the equivalent measure for a 2 circle times 2 system, via a 2 circle times 3 system, to the general bipartite case. The measure emphasizes the role Bell states have, both for forming the measure and for experimentally measuring the entanglement. The form of the measure is similar to the generalized concurrence. In the case of 2 circle times 3 systems, we prove that our measure, which is directly measurable, equals the concurrence. It is also shown that, in order to measure the entanglement, it is sufficient to measure the projections of the state onto a maximum of M(M-1)N(N-1)/2 Bell states.
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| 7. |
- Khodorkovskii, M. A., et al.
(författare)
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Electronic spectra of XeNe molecules in the range 77100-90100 cm(-1) near Xe* (6p, 5d, 6p', 7s, 7p, 6d) obtained by the (3+1) REMPI and (2+1) REMPI methods
- 2010
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Ingår i: Optics and Spectroscopy. - 0030-400X .- 1562-6911. ; 108:6, s. 899-914
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Tidskriftsartikel (refereegranskat)abstract
- The electronic spectra of XeNe molecules in the range of 77100-90100 cm(-1) are measured by the method of laser resonance multiphoton ionization in a supersonic jet. The photoionization spectra are obtained upon two- and three-photon excitations of molecules and their ionization by the next photon. In the range of 80300-90100 cm(-1) near Xe*(5d, 6p', 6d, 7s, and 7p), the spectra are obtained for the first time. A whole number of vibrational systems are measured in this range. The majority of vibrational systems near Xe* (5d, 6d, 7p, and 7s) are located in the red range with respect to their dissociation limits. In the blue range with respect to the dissociation limits, continua corresponding to transitions of molecules from the ground state to repulsive potential curves of excited states are detected. For a number of excited states of XeNe molecules, the vibrational analysis is performed and molecular constants are estimated.
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| 8. |
- Khodorkovskii, M. A., et al.
(författare)
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Multiphoton mass spectra of XeKr molecules in the range of excited Xe*6p[5/2](2,3) atoms
- 2007
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Ingår i: Optics and Spectroscopy. - 0030-400X .- 1562-6911. ; 102:6, s. 834-841
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Tidskriftsartikel (refereegranskat)abstract
- Data on excited states of XeKr molecules in the energy range 78280-77600 cm(-1) are obtained. Using the method of multiphoton laser photoionization of molecules in a supersonic jet, five vibrational progressions of XeKr molecules are obtained, which are attributed to five electronic-vibrational transitions from the ground state of the XeKr molecule of the symmetry 0(+) to excited states of the symmetry Omega = 0(+), 1, 2 with the dissociation limit (KrS0)-S-1 + Xe*6p[5/2](2) and of the symmetry Omega = 1, 2 with the dissociation limit Kr + Xe*6p[5/2](3). The molecular constants of the corresponding excited states of the XeKr molecule are estimated.
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| 9. |
- Khodorkovskii, M. A., et al.
(författare)
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Study of the lowest electronic states of Xe-2, XeKr, and XeAr molecules by the method of multiphoton resonance ionization
- 2008
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Ingår i: Optics and Spectroscopy. - 0030-400X .- 1562-6911. ; 104:5, s. 674-685
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Tidskriftsartikel (refereegranskat)abstract
- The spectra of Xe-2, XeKr, and XeAr molecules in the range 66 500-68 800 cm(-1) are obtained by the methods of (2 + n) and (3 + n) (n = 1, 2, 3) resonance multiphoton ionization during the registration of molecular and atomic ions. The combining of two-and three-photon resonance excitations of Xe-2 molecules makes it possible to obtain the spectra caused by transitions from the ground state X0(g)(+) to the excited states of Xe*6s[3/2](1,2)degrees(XeS0)-S-1 molecules both of the even (0(g)(+), 1(g) ) and of the odd (B0(u)(+), B'1(u) , 2(u) ) symmetries. The data on the Omega = 2(u) state of the Xe-2 molecule with the dissociation limit Xe*6s[3/2](2)degrees + (XeS0)-S-1 and on the Omega = 1 state of the XeAr molecule with the dissociation limit Xe*6s[3/2](1)degrees (ArS0)-S-1 are obtained for the first time. The potential curve of the excited 2(u) state of the Xe*6s[3/2](2)degrees (XeS0)-S-1 molecule is repulsive and intersects the potential curve of the B0(u) + state of the Xe*6s[3/2](1)degrees (XeS0)-S-1 molecule. In the case of the three-photon excitation, it is observed that all the bands in the spectra of XeKr and XeAr molecules are broadened and are shifted, which indicates that, in an intense light field, the influence of the dynamic Stark effect is significant.
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| 10. |
- Kozmin, Kirill, et al.
(författare)
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Memory-efficient algorithm for lens distortion compensation
- 2003
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Ingår i: Optics and Spectroscopy. - : Pleiades Publishing Ltd. - 0030-400X .- 1562-6911. ; 95:1, s. 139-141
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Tidskriftsartikel (refereegranskat)abstract
- Distortion introduced by a lens in a measurement system based on an image sensor usually must be compensated. The memory used for distortion compensation by a lookup table is proportional to the image sensor size. To reduce the memory usage, a compression algorithm is proposed and implemented.
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