Quantum coherence in photo-ionisation with tailored XUV pulses

@article{Carlstrom2018QuantumCI,
  title={Quantum coherence in photo-ionisation with tailored XUV pulses},
  author={Stefanos Carlstrom and Johan Mauritsson and Kenneth J. Schafer and Anne L’Huillier and Mathieu Gisselbrecht},
  journal={Journal of Physics B},
  year={2018},
  volume={51},
  pages={015201}
}
Ionisation with ultrashort pulses in the extreme ultraviolet (XUV) regime can be used to prepare an ion in a superposition of spin-orbit substates. In this work, we study the coherence properties of such a superposition, created by ionising xenon atoms using two phase-locked XUV pulses at different frequencies. In general, if the duration of the driving pulse exceeds the quantum beat period, dephasing will occur. If however, the frequency difference of the two pulses matches the spin-orbit… 

Figures and Tables from this paper

Quantum coherent control of the photoelectron angular distribution in bichromatic-field ionization of atomic neon
We investigate the coherent control of the photoelectron angular distribution in bichromatic atomic ionization. Neon is selected as target since it is one of the most popular systems in current
Quantum control and characterization of ultrafast ionization with orthogonal two-color laser pulses
TLDR
It is shown that with the use of the OTC scheme, one can tailor the properties of the control pulse to lead to enhancement of the ionization rate through the Autler-Townes effect without affecting the dynamic interference, which is shown to result from constructive interferences between partial photoelectron waves having opposite-parity.
Vibronic coherence and quantum beats of O2+ based on laser pump-probe dissociation dynamics
We report theoretical investigations of vibronic quantum beats (QBs) which can be observed in the molecular dissociation under the intense infrared (IR) laser pump-IR laser probe scheme. We show how
Nonlinear ionization dynamics of hot dense plasma observed in a laser-plasma amplifier
TLDR
The presented approach shows the possibility of directly modelling light-plasma interactions in extreme conditions, such as those present during the early times of the universe, with direct experimental verification.
Entanglement and coherence in photoionization of H2 by an ultrashort XUV laser pulse
We make a theoretical investigation of photoionization of an ${\mathrm{H}}_{2}$ molecule, induced by the irradiation of an ultrashort extreme ultraviolet (XUV) laser pulse. We consider a system
Quantifying Decoherence in Attosecond Metrology
A new analysis shows how to measure the density matrix of an ionized electron to reconstruct its wave packet and identify sources of quantum decoherence.
The Holomorphic Process: Understanding the Holographic Nature of Reality as a Metamorphic Process
The holographic principle, derived from black hole mathematics in cosmology, is gaining interest as a theory of reality, but it is missing the part that explains how the information gets from the
Multiple-Photon Resonance Enabled Quantum Interference in Emission Spectroscopy of N_2^+
: Quantum interference occurs frequently in the interaction of laser radiation with materials, leading to a series of fascinating effects such as lasing without inversion, electromagnetically induced
Autoionizing Polaritons in Attosecond Atomic Ionization.
TLDR
This work measures a controllable stabilization of the polaritons against ionization, using an extension of the Jaynes-Cummings model to autoionizing states, and shows that this stabilization is due to the destructive interference between the Auger decay and the radiative ionization of the Polaritonic components.

References

SHOWING 1-10 OF 19 REFERENCES
Decoherence in attosecond photoionization.
TLDR
It is found that interchannel coupling not only affects the hole populations, but it also enhances the entanglement between the photoelectron and the remaining ion, thereby reducing the coherence within the ion.
Preparing attosecond coherences by strong-field ionization
Strong-field ionization (SFI) has been shown to prepare wave packets with few-femtosecond periods. Here, we explore whether this technique can be extended to the attosecond time scale. We introduce
Attosecond electron spectroscopy using a novel interferometric pump-probe technique.
TLDR
An interferometric pump-probe technique that uses a free WP as a reference to measure a bound WP and analysis of the interferogram allows us to determine the bound WP components with a spectral resolution much better than the inverse of the AP duration.
Observation of Ramsey's Interference Fringes in the Profile of Doppler-Free Two-Photon Resonances
Using two coherent time-delayed short pulses, we have demonstrated that one can obtain, in the profile of Doppler-free two-photon resonances, interference fringes with a splitting $\frac{1}{2T}$
Extreme-ultraviolet pump–probe studies of one-femtosecond-scale electron dynamics
Pump–probe measurements are now an essential tool for investigating ultrafast dynamics in atoms and molecules. A lack of sources producing high-intensity attosecond pulses of extreme-ultraviolet
FAST TRACK COMMUNICATION: Two-photon double ionization of Ne by free-electron laser radiation: a kinematically complete experiment
We present kinematically complete data on two-photon double ionization of Ne induced by short (~25 fs) intense (~5 × 1013 W cm−2) free-electron laser pulses at 44 eV. The observed electron energy
Time-dependent theory of angular correlations in sequential double ionization.
TLDR
The present analysis reveals that short-pulse coherent excitation of the neon ionic doublet 2P(1/2,3/2) leads to quantum beats in the two-electron angular correlation patterns.
Reconstruction of attosecond electron wave packets using quantum state holography
We present a method for performing quantum state holography, with which we completely characterize the amplitude and phase of an attosecond electron wave packet. Our approach is an extension of a
Real-time observation of valence electron motion
TLDR
An attosecond pump–probe measurement of the density matrix of valence electrons in atomic krypton ions is reported, able to completely characterize the quantum mechanical electron motion and determine its degree of coherence in the specimen of the ensemble.
Numerical time propagation of quantum systems in radiation fields
Atoms, molecules or excitonic quasiparticles, for which excitations are induced by external radiation fields and energy is dissipated through radiative decay, are examples of driven open quantum
...
1
2
...