Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

AIP conference proceedings

Attosecond coherent control of the wave packet dynamics in the Hg–X van der Waals interaction

Kenji Ohmori

Published Jan 1, 2001• 0 citations
Publisher

Abstract

We have performed the double-pulse coherent control of nuclear wave packets, where the sequence of two identical femtosecond laser pulses generates two identical nuclear wave packets in the A30+ state of the single Hg–Ar van der Waals complex. The time delay between the two laser pulses is tuned with an accuracy in attosecond time scale to induce constructive and destructive interferences of the two nuclear wave packets. The interferogram measured by scanning the time delay shows a high-frequency oscillation with a period of 830 attoseconds. Wave packets have been manipulated in attosecond time scale for the first time.

DOI
10.1063/1.1370638

Related papers

Attosecond Coherent Control of Single and Double Photoionization in Argon

Craig Hogle, Xiao‐Min Tong, Leigh S. Martin +3 more

Ultrafast high harmonic beams provide new opportunities for coherently controlling excitation and ionization processes in atoms, molecules, and materials on attosecond time scales by employing multiphoton two-pathway electron-wave-packet quantum interferences. Here we use spectrally tailored and frequency tuned vacuum and extreme ultraviolet harmonic combs, together with two phase-locked infrared laser fields, to show how the total single and double photoionization yields of argon can be coherently modulated by controlling the relative phases of both optical and electronic-wave-packet quantum interferences. This Letter is the first to apply quantum control techniques to double photoionization, which is a fundamental process where a single, high-energy photon ionizes two electrons simultaneously from an atom.

Physical Review Letters•Oct 22, 2015•17 citations

Coherent control of atoms in the extreme ultraviolet and attosecond regime by synchrotron radiation

T. Kaneyasu, Y. Hikosaka, Masaki Fujimoto +2 more

Abstract Control of interference between wave packets is one of the basic concepts in coherent control that enables quantum manipulation of populations and reaction pathways in matter. We have recently shown a new method to achieve coherent control in the extreme ultraviolet and attosecond regime using synchrotron radiation. This method is based on the use of longitudinal coherence of light wave packets that are naturally included in the undulator radiation. For quantum manipulation of atomic systems, wave packet interference is precisely controlled by tuning the time delay between the light wave packets. Here we show that the quantum phase controlled by the time delay can be monitored as an initial phase of the quantum beat oscillation in fluorescence decay.

Journal of Physics Conference Series•Dec 1, 2022•0 citations

Resonant enhancement of a single attosecond pulse in a gas medium by a time-delayed control field

Wei-Chun Chu, C D Lin

An optical coherent control scheme has been proposed and theoretically investigated where an extreme ultraviolet single attosecond pulse (SAP) propagates through dense helium gas dressed by a time-delayed femtosecond laser pulse. The laser pulse couples the 2s2p( 1 P) and 2s 2 ( 1 S) autoionizing states when the SAP excites the 2s2p state. After going through the gas, the spectral and temporal profiles of the SAP are strongly distorted. A narrowed but enhanced spike in the spectrum shows up for specific intensities and time delays of the laser, which exemplifies the control of a broadband photon wave packet by an ultrashort dressing field for the first time. We analyse the photon and electron dynamics and determine the dressing condition that maximizes this enhancement. The result demonstrates new possibilities of attosecond optical control.

arXiv:1205.4767•Journal of Physics B Atomic Molecular and Optical Physics•Sep 21, 2012•8 citations

Femtosecond time-resolved spectroscopy and coherent control in Cs2

Valérie Blanchet, M. A. Bouchène, B. Girard

We show how two identical laser pulses (with a controlled delay time) can be used to create a coherent superposition of two vibrational wave packets in a bound electronic state, which exhibit the following features as a function of the delay time between the laser pulses: high frequency oscillation (at the Bohr frequency) modulated by a slow envelope corresponding to the vibrational recurrences. We present a theoretical treatment of this effect and experimental results obtained in Cs2, with 160 fs, 768 nm laser pulses, in which the high frequency modulation is resolved, with a beat period of 2.6 fs1. Finally, we show how the detection scheme can affect the observability of these interferences when only two laser pulses are used: at 758 nm the interference fringes cannot be observed.

AIP conference proceedings•Jan 1, 1996•0 citations

Resonant enhancement of a single attosecond pulse in a gas medium by a time-delayed control field

Chu, Wei-Chun, Lin, Chii Dong

An optical coherent control scheme has been proposed and theoretically investigated where an extreme ultraviolet single attosecond pulse (SAP) propagates through a dense helium gas dressed by a time-delayed femtosecond laser pulse. The laser pulse couples the 2s2p([superscript]1P) and 2s[superscript]2([superscript]1S) autoionizing states when the SAP excites the 2s2p state. After going through the gas, the spectral and temporal profiles of the SAP are strongly distorted. A narrowed but enhanced spike in the spectrum shows up for specific intensities and time delays of the laser, which exemplifies the control of a broadband photon wave packet by an ultrashort dressing field for the first time. We analyze the photon and electron dynamics and determine the dressing condition that maximizes this enhancement. The result demonstrates new possibilities of attosecond optical control.

•Jan 1, 2012•3 citations

Toward Coherent Control Around the Quantum-Classical Boundary

Hiroyuki Katsuki, Kenji Ohmori

Coherent control is a technique to manipulate the amplitudes and phases of wave functions by exploiting the coherent property of light. It is of great importance for the development of quantum technologies including quantum information processing and chemical reaction control as well as for addressing fundamental problems in quantum mechanics such as the quantum–classical boundary. In this chapter, we describe the development and applications of coherent control based on wave-packet interferometry with attosecond precision, which has been made possible by tuning the delay between two laser pulses on the attosecond time scale. This technique has been applied to several different hierarchies from simple to complex quantum systems: (i) isolated iodine molecules in the gas phase, (ii) molecular crystals of para-hydrogen, and (iii) single crystals of bismuth. In system (i), we have controlled and visualized the interference of vibrational wave packets in the isolated iodine molecules, and that wave-packet interference has been utilized to develop a molecular computer, which executes ultrafast Fourier transform. In system (ii), we have manipulated vibrational wave-functions delocalized in a para-hydrogen crystal. The long coherence lifetime of para-hydrogen crystals is a promising resource to preserve quantum information in bulk solids. In system (iii), we have controlled the excitation ratio of two orthogonal coherent phonon modes, whose coherent superposition has allowed for active control of ultrafast two-dimensional atomic motions in a single crystal of bismuth. Those atomic motions have been visualized by density functional theory calculations. Finally, the coherent control of an ensemble of ultracold Rydberg atoms is briefly discussed as future perspectives for exploring the quantum–classical boundary.

Advances in chemical physics•Apr 1, 2016•0 citations
We have performed the double-pulse coherent control of nuclear wave packets, where the sequence of two identical femtosecond laser pulses generates two identical nuclear wave packets in the A30+ state of the single Hg–Ar van der Waals complex. The time delay between the two laser pulses is tuned with an accuracy in attosecond time scale to induce constructive and destructive interferences of the two nuclear wave packets. The interferogram measured by scanning the time delay shows a high-frequency oscillation with a period of 830 attoseconds. Wave packets have been manipulated in attosecond time scale for the first time.
Ultrafast high harmonic beams provide new opportunities for coherently controlling excitation and ionization processes in atoms, molecules, and materials on attosecond time scales by employing multiphoton two-pathway electron-wave-packet quantum interferences. Here we use spectrally tailored and frequency tuned vacuum and extreme ultraviolet harmonic combs, together with two phase-locked infrared laser fields, to show how the total single and double photoionization yields of argon can be coherently modulated by controlling the relative phases of both optical and electronic-wave-packet quantum interferences. This Letter is the first to apply quantum control techniques to double photoionization, which is a fundamental process where a single, high-energy photon ionizes two electrons simultaneously from an atom.
Abstract Control of interference between wave packets is one of the basic concepts in coherent control that enables quantum manipulation of populations and reaction pathways in matter. We have recently shown a new method to achieve coherent control in the extreme ultraviolet and attosecond regime using synchrotron radiation. This method is based on the use of longitudinal coherence of light wave packets that are naturally included in the undulator radiation. For quantum manipulation of atomic systems, wave packet interference is precisely controlled by tuning the time delay between the light wave packets. Here we show that the quantum phase controlled by the time delay can be monitored as an initial phase of the quantum beat oscillation in fluorescence decay.
An optical coherent control scheme has been proposed and theoretically investigated where an extreme ultraviolet single attosecond pulse (SAP) propagates through dense helium gas dressed by a time-delayed femtosecond laser pulse. The laser pulse couples the 2s2p( 1 P) and 2s 2 ( 1 S) autoionizing states when the SAP excites the 2s2p state. After going through the gas, the spectral and temporal profiles of the SAP are strongly distorted. A narrowed but enhanced spike in the spectrum shows up for specific intensities and time delays of the laser, which exemplifies the control of a broadband photon wave packet by an ultrashort dressing field for the first time. We analyse the photon and electron dynamics and determine the dressing condition that maximizes this enhancement. The result demonstrates new possibilities of attosecond optical control.
We show how two identical laser pulses (with a controlled delay time) can be used to create a coherent superposition of two vibrational wave packets in a bound electronic state, which exhibit the following features as a function of the delay time between the laser pulses: high frequency oscillation (at the Bohr frequency) modulated by a slow envelope corresponding to the vibrational recurrences. We present a theoretical treatment of this effect and experimental results obtained in Cs2, with 160 fs, 768 nm laser pulses, in which the high frequency modulation is resolved, with a beat period of 2.6 fs1. Finally, we show how the detection scheme can affect the observability of these interferences when only two laser pulses are used: at 758 nm the interference fringes cannot be observed.
An optical coherent control scheme has been proposed and theoretically investigated where an extreme ultraviolet single attosecond pulse (SAP) propagates through a dense helium gas dressed by a time-delayed femtosecond laser pulse. The laser pulse couples the 2s2p([superscript]1P) and 2s[superscript]2([superscript]1S) autoionizing states when the SAP excites the 2s2p state. After going through the gas, the spectral and temporal profiles of the SAP are strongly distorted. A narrowed but enhanced spike in the spectrum shows up for specific intensities and time delays of the laser, which exemplifies the control of a broadband photon wave packet by an ultrashort dressing field for the first time. We analyze the photon and electron dynamics and determine the dressing condition that maximizes this enhancement. The result demonstrates new possibilities of attosecond optical control.
Coherent control is a technique to manipulate the amplitudes and phases of wave functions by exploiting the coherent property of light. It is of great importance for the development of quantum technologies including quantum information processing and chemical reaction control as well as for addressing fundamental problems in quantum mechanics such as the quantum–classical boundary. In this chapter, we describe the development and applications of coherent control based on wave-packet interferometry with attosecond precision, which has been made possible by tuning the delay between two laser pulses on the attosecond time scale. This technique has been applied to several different hierarchies from simple to complex quantum systems: (i) isolated iodine molecules in the gas phase, (ii) molecular crystals of para-hydrogen, and (iii) single crystals of bismuth. In system (i), we have controlled and visualized the interference of vibrational wave packets in the isolated iodine molecules, and that wave-packet interference has been utilized to develop a molecular computer, which executes ultrafast Fourier transform. In system (ii), we have manipulated vibrational wave-functions delocalized in a para-hydrogen crystal. The long coherence lifetime of para-hydrogen crystals is a promising resource to preserve quantum information in bulk solids. In system (iii), we have controlled the excitation ratio of two orthogonal coherent phonon modes, whose coherent superposition has allowed for active control of ultrafast two-dimensional atomic motions in a single crystal of bismuth. Those atomic motions have been visualized by density functional theory calculations. Finally, the coherent control of an ensemble of ultracold Rydberg atoms is briefly discussed as future perspectives for exploring the quantum–classical boundary.