Application of the density matrix multipole expansion to stark quantum beats from beam-foil-excited hydrogen atoms

1984 ◽  
Vol 3 (4) ◽  
pp. 653-662 ◽  
Author(s):  
F. Battaglia ◽  
T. F. George
Keyword(s):  
Density Matrix ◽  
Multipole Expansion ◽  
Quantum Beats ◽  
Hydrogen Atoms ◽  
Beam Foil

Zero-Field Quantum Beats in Lyman-βRadiation from Beam-Foil-Excited Hydrogen Atoms

1971 ◽  
Vol 26 (20) ◽  
pp. 1211-1213 ◽  
Author(s):  
D. J. Lynch ◽  
C. W. Drake ◽  
M. J. Alguard ◽  
C. E. Fairchild
Keyword(s):  
Quantum Beats ◽  
Zero Field ◽  
Hydrogen Atoms ◽  
Beam Foil

Study of Multiple Quantum Beats in Atomic Wavepackets

2013 ◽  
Vol 325-326 ◽  
pp. 119-122
Author(s):  
Chang Jun Zhu ◽  
Bing Xue ◽  
Xue Jun Zhai ◽  
Jun Fang He
Keyword(s):  
Density Matrix ◽  
Four Wave Mixing ◽  
Quantum Beat ◽  
System Response ◽  
Quantum Beats ◽  
Multiple Quantum ◽  
Wave Mixing ◽  
Third Order ◽  
Mixing Processes ◽  
The Third

A theoretical model consisting of 5 energy levels in coupled four-wave mixing processes was proposed to analyze the coherent characteristics of atomic wavepackets using perturbative theory. The equations of motions of the density matrix were derived and the third-order density matrix elements were presented. Under the condition that the duration of laser pulses is sufficiently short, the system response was treated as impulse response. Moreover, in the lowest order perturbation theory, the third-order nonlinear polarization was obtained using rotating-wave approximation. The results show that multiple quantum beats are embedded in the coupled four-wave mixing signals, and coherent dynamics of wavepackets can be retrieved from the quantum beat dynamics.

Zero-field quantum beats in Lyman-α radiation subsequent to beam-foil interaction of protons

1972 ◽  
Vol 257 (3) ◽  
pp. 272-278 ◽  
Author(s):  
P. Dobberstein ◽  
H. J. Andrä ◽  
W. Wittmann ◽  
H. H. Bukow
Keyword(s):  
Quantum Beats ◽  
Zero Field ◽  
Beam Foil

scholarly journals Optimizing electronic structure simulations on a trapped-ion quantum computer using problem decomposition

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Yukio Kawashima ◽  
Erika Lloyd ◽  
Marc P. Coons ◽  
Yunseong Nam ◽  
Shunji Matsuura ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Density Matrix ◽  
Ion Trap ◽  
Quantum Computer ◽  
Material Design ◽  
Basis Set ◽  
Energy Curve ◽  
Problem Decomposition ◽  
Hydrogen Atoms ◽  
Minimal Basis

AbstractQuantum computers have the potential to advance material design and drug discovery by performing costly electronic structure calculations. A critical aspect of this application requires optimizing the limited resources of the quantum hardware. Here, we experimentally demonstrate an end-to-end pipeline that focuses on minimizing quantum resources while maintaining accuracy. Using density matrix embedding theory as a problem decomposition technique, and an ion-trap quantum computer, we simulate a ring of 10 hydrogen atoms without freezing any electrons. The originally 20-qubit system is decomposed into 10 two-qubit problems, making it amenable to currently available hardware. Combining this decomposition with a qubit coupled cluster circuit ansatz, circuit optimization, and density matrix purification, we accurately reproduce the potential energy curve in agreement with the full configuration interaction energy in the minimal basis set. Our experimental results are an early demonstration of the potential for problem decomposition to accurately simulate large molecules on quantum hardware.

Formation of highly excited hydrogen atoms in a beam-foil interaction

1982 ◽  
Vol 87 (5) ◽  
pp. 232 ◽  
Author(s):  
C.J. Latimer ◽  
R.G. McMahon ◽  
D.P. Murtagh
Keyword(s):  
Hydrogen Atoms ◽  
Beam Foil
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