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Katsuki H, Chiba H, Meier C, Girard B, Ohmori K. Wave packet interferometry with attosecond precision and picometric structure. Phys Chem Chem Phys 2010; 12:5189-98. [PMID: 20405071 DOI: 10.1039/b927518e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Wave packet (WP) interferometry is applied to the vibrational WPs of the iodine molecule. Interference fringes of quantum waves weave highly regular space-time images called "quantum carpets." The structure of the carpet has picometre and femtosecond resolutions, and changes drastically depending on the amplitudes and phases of the vibrational eigenstates composing the WP. In this review, we focus on the situation where quantum carpets are created by two counter-propagating nuclear vibrational WPs. Such WPs can be prepared with either a single or double femtosecond (fs) laser pulse. In the single pulse scheme, the relevant situation appears around the half revival time. Similar situations can be generated with a pair of fs laser pulses whose relative phase is stabilized on the attosecond time scale. In the latter case we can design the quantum carpet by controlling the timing between the phase-locked pulses. We demonstrate this carpet design and visualize the designed carpets by the fs pump-probe measurements, tuning the probe wavelength to resolve the WP density-distribution along the internuclear axis with ~3 pm spatial resolution and ~100 fs temporal resolution.
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Affiliation(s)
- Hiroyuki Katsuki
- Institute for Molecular Science, National Institutes of Natural Sciences, Myodaiji, Okazaki 444-8585, Japan.
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Kirrander A, Fielding HH, Jungen C. Optical phase and the ionization-dissociation dynamics of excited H2. J Chem Phys 2010; 132:024313. [DOI: 10.1063/1.3285710] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Kirrander A, Jungen C, Fielding HH. Control of ionization and dissociation by optical pulse trains. Phys Chem Chem Phys 2010; 12:8948-52. [DOI: 10.1039/c002517h] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
This review summarizes progress in coherent control as well as relevant recent achievements, highlighting, among several different schemes of coherent control, wave-packet interferometry (WPI). WPI is a fundamental and versatile scenario used to control a variety of quantum systems with a sequence of short laser pulses whose relative phase is finely adjusted to control the interference of electronic or nuclear wave packets (WPs). It is also useful in retrieving quantum information such as the amplitudes and phases of eigenfunctions superposed to generate a WP. Experimental and theoretical efforts to retrieve both the amplitude and phase information are recounted. This review also discusses information processing based on the eigenfunctions of atoms and molecules as one of the modern and future applications of coherent control. The ultrafast coherent control of ultracold atoms and molecules and the coherent control of complex systems are briefly discussed as future perspectives.
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Affiliation(s)
- Kenji Ohmori
- Institute for Molecular Science, National Institutes of Natural Sciences; The Graduate University for Advanced Studies (SOKENDAI); and CREST, Japan Science and Technology Agency, Myodaiji, Okazaki 444-8585, Japan
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Katsuki H, Chiba H, Meier C, Girard B, Ohmori K. Actively tailored spatiotemporal images of quantum interference on the picometer and femtosecond scales. PHYSICAL REVIEW LETTERS 2009; 102:103602. [PMID: 19392112 DOI: 10.1103/physrevlett.102.103602] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2008] [Indexed: 05/27/2023]
Abstract
Interference fringes of quantum waves weave highly regular space-time images, which could be seen in various wave systems such as wave packets in atoms and molecules, Bose-Einstein condensates, and fermions in a box potential. We have experimentally designed and visualized spatiotemporal images of dynamical quantum interferences of two counterpropagating nuclear wave packets in the iodine molecule; the wave packets are generated with a pair of femtosecond laser pulses whose relative phase is locked within the attosecond time scale. The design of the image has picometer and femtosecond resolutions, and changes drastically as we change the relative phase of the laser pulses, providing a direct spatiotemporal control of quantum interferences.
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Affiliation(s)
- Hiroyuki Katsuki
- Institute for Molecular Science, National Institutes of Natural Sciences, Myodaiji, Okazaki 444-8585, Japan
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Abstract
Coherent manipulations of atoms using laser lightThe internal structure of a particle - an atom or other quantum system in which the excitation energies are discrete - undergoes change when exposed to pulses of near-resonant laser light. This tutorial review presents basic concepts of quantum states, of laser radiation and of the Hilbert-space statevector that provides the theoretical portrait of probability amplitudes - the tools for quantifying quantum properties not only of individual atoms and molecules but also of artificial atoms and other quantum systems. It discusses the equations of motion that describe the laser-induced changes (coherent excitation), and gives examples of laser-pulse effects, with particular emphasis on two-state and three-state adiabatic time evolution within the rotating-wave approximation. It provides pictorial descriptions of excitation based on the Bloch equations that allow visualization of two-state excitation as motion of a three-dimensional vector (the Bloch vector). Other visualization techniques allow portrayal of more elaborate systems, particularly the Hilbert-space motion of adiabatic states subject to various pulse sequences. Various more general multilevel systems receive treatment that includes degeneracies, chains and loop linkages. The concluding sections discuss techniques for creating arbitrary pre-assigned quantum states, for manipulating them into alternative coherent superpositions and for analyzing an unknown superposition. Appendices review some basic mathematical concepts and provide further details of the theoretical formalism, including photons, pulse propagation, statistical averages, analytic solutions to the equations of motion, exact solutions of periodic Hamiltonians, and population-trapping "dark" states.
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Ohmori K. Development of ultrahigh-precision coherent control and its applications. PROCEEDINGS OF THE JAPAN ACADEMY. SERIES B, PHYSICAL AND BIOLOGICAL SCIENCES 2008; 84:167-75. [PMID: 18941296 PMCID: PMC3665367 DOI: 10.2183/pjab.84.167] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2008] [Accepted: 03/31/2008] [Indexed: 05/26/2023]
Abstract
Coherent control is based on optical manipulation of the amplitudes and phases of wave functions. It is expected to be a key technique to develop novel quantum technologies such as bond-selective chemistry and quantum computing, and to better understand the quantum worldview founded on wave-particle duality. We have developed high-precision coherent control by imprinting optical amplitudes and phases of ultrashort laser pulses on the quantum amplitudes and phases of molecular wave functions. The history and perspective of coherent control and our recent achievements are described.
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Affiliation(s)
- Kenji Ohmori
- Institute for Molecular Science, National Institutes of Natural Sciences, Aichi, Japan.
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Ohmori K, Katsuki H, Chiba H, Honda M, Hagihara Y, Fujiwara K, Sato Y, Ueda K. Real-time observation of phase-controlled molecular wave-packet interference. PHYSICAL REVIEW LETTERS 2006; 96:093002. [PMID: 16606260 DOI: 10.1103/physrevlett.96.093002] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2005] [Indexed: 05/08/2023]
Abstract
The quantum interference of two molecular wave packets has been precisely controlled in the B electronic state of the I2 molecule by using a pair of fs laser pulses whose relative phase is locked within the attosecond time scale and its real-time evolution has been observed by another fs laser pulse. It is clearly observed that the temporal evolution changes drastically as a function of the relative phase between the locked pulses, allowing us to read both amplitude and phase information stored in the wave functions of the molecular ensemble.
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Affiliation(s)
- Kenji Ohmori
- Institute for Molecular Science, National Institutes of Natural Sciences, Myodaiji, Okazaki 444-8585, Japan.
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Yokoyama K, Teranishi Y, Toya Y, Shirai T, Fukuda Y, Aoyama M, Akahane Y, Inoue N, Ueda H, Yamakawa K, Yokoyama A, Yamada H, Yabushita A, Sugita A. Optimal control of ultrafast selection. J Chem Phys 2004; 120:9446-9. [PMID: 15267954 DOI: 10.1063/1.1752882] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Optimal laser control for ultrafast selection of closely lying excited states whose energy separation is smaller than the laser bandwidth is reported on the two-photon transition of atomic cesium; Cs(6S-->7D(J), J=5/2 and 3/2). Selective excitation was carried out by pulse shaping of ultrashort laser pulses which were adaptively modulated in a closed-loop learning system handling eight parameters representing the electric field. Two-color fluorescence from the respective excited states was monitored to measure the selectivity. The fitness used in the learning algorithm was evaluated from the ratio of the fluorescence yields. After fifty generations, a pair of nearly transform-limited pulses were obtained as an optimal pulse shape, proving the effectiveness of the "Ramsey fringes" mechanism. The contrast of the selection ratio was improved by approximately 30% from the simple "Ramsey fringes" experiment.
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Affiliation(s)
- K Yokoyama
- Advanced Photon Research Center, Japan Atomic Energy Research Institute, Kizu-cho, Kyoto 619-0215, Japan
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Dantus M, Lozovoy VV. Experimental Coherent Laser Control of Physicochemical Processes. Chem Rev 2004; 104:1813-59. [PMID: 15080713 DOI: 10.1021/cr020668r] [Citation(s) in RCA: 144] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Marcos Dantus
- Department of Chemistry and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
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Ohmori K, Sato Y, Nikitin EE, Rice SA. High-precision molecular wave-packet interferometry with HgAr dimers. PHYSICAL REVIEW LETTERS 2003; 91:243003. [PMID: 14683114 DOI: 10.1103/physrevlett.91.243003] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2003] [Indexed: 05/24/2023]
Abstract
Molecular wave-packet (WP) interferometry has been demonstrated in the A electronic state of the HgAr van der Waals complex with two time-delayed UV fs pulses at 254 nm. The interferograms of three vibrational levels in the WP's display almost 100% fringe contrast as a function of the interpulse delay tau, which is tuned with sub-10 as stability and resolution. It is clearly observed that the three interferograms show their dephasing and rephasing within a single vibrational period, allowing us to prepare arbitrary relative populations of the three levels by adjusting a single parameter tau.
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Affiliation(s)
- Kenji Ohmori
- Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan.
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Weinacht T, Bartels R, Backus S, Bucksbaum P, Pearson B, Geremia J, Rabitz H, Kapteyn H, Murnane M. Coherent learning control of vibrational motion in room temperature molecular gases. Chem Phys Lett 2001. [DOI: 10.1016/s0009-2614(01)00788-6] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Akulin VM, Dubovitskii VA, Dykhne AM, Rudavets AG. Laser Control of Atomic Motion inside Diatomic Molecules. J Phys Chem A 1998. [DOI: 10.1021/jp980689i] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- V. M. Akulin
- Laboratory Aimé Cotton, Bat. 505, Campus d'Orsay, 91405 Orsay, France, Institute of Chemical Physics, 142432 Chernogolovka, Russia, TRINITI, 142092 Troitsk, Russia, and Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
| | - V. A. Dubovitskii
- Laboratory Aimé Cotton, Bat. 505, Campus d'Orsay, 91405 Orsay, France, Institute of Chemical Physics, 142432 Chernogolovka, Russia, TRINITI, 142092 Troitsk, Russia, and Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
| | - A. M. Dykhne
- Laboratory Aimé Cotton, Bat. 505, Campus d'Orsay, 91405 Orsay, France, Institute of Chemical Physics, 142432 Chernogolovka, Russia, TRINITI, 142092 Troitsk, Russia, and Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
| | - A. G. Rudavets
- Laboratory Aimé Cotton, Bat. 505, Campus d'Orsay, 91405 Orsay, France, Institute of Chemical Physics, 142432 Chernogolovka, Russia, TRINITI, 142092 Troitsk, Russia, and Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
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