Quantum algorithm for preparing the ground state of a physical system through multi-step quantum resonant transitions

2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Hefeng Wang ◽  
Sixia Yu
Keyword(s):  
Ground State ◽  
Physical System ◽  
Quantum Algorithm ◽  
Resonant Transitions

scholarly journals A quantum algorithm for obtaining the energy spectrum of a physical system without guessing its eigenstates

2014 ◽  
Vol 16 (30) ◽  
pp. 16241-16245 ◽  
Author(s):  
Hefeng Wang
Keyword(s):  
Energy Spectrum ◽  
Physical System ◽  
Quantum Algorithm

We present a quantum algorithm that provides a general approach for obtaining the energy spectrum of a physical system without making a guess on its eigenstates.

scholarly journals Variational Quantum Chemistry Programs in JaqalPaq

Entropy ◽  
2021 ◽  
Vol 23 (6) ◽  
pp. 657
Author(s):  
Oliver G. Maupin ◽  
Andrew D. Baczewski ◽  
Peter J. Love ◽  
Andrew J. Landahl
Keyword(s):  
Quantum Chemistry ◽  
Programming Language ◽  
Ground State ◽  
Scientific Computing ◽  
Assembly Language ◽  
Quantum Algorithm ◽  
Meta Programming ◽  
Dissociation Curves ◽  
Ground State Energies ◽  
Python Package

We present example quantum chemistry programs written with JaqalPaq, a python meta-programming language used to code in Jaqal (Just Another Quantum Assembly Language). These JaqalPaq algorithms are intended to be run on the Quantum Scientific Computing Open User Testbed (QSCOUT) platform at Sandia National Laboratories. Our exemplars use the variational quantum eigensolver (VQE) quantum algorithm to compute the ground state energies of the H2, HeH+, and LiH molecules. Since the exemplars focus on how to program in JaqalPaq, the calculations of the second-quantized Hamiltonians are performed with the PySCF python package, and the mappings of the fermions to qubits are obtained from the OpenFermion python package. Using the emulator functionality of JaqalPaq, we emulate how these exemplars would be executed on an error-free QSCOUT platform and compare the emulated computation of the bond-dissociation curves for these molecules with their exact forms within the relevant basis.

scholarly journals A Simple Thermodynamical Witness Showing Universality of Macroscopic Entanglement

2009 ◽  
Vol 16 (02n03) ◽  
pp. 287-291 ◽  
Author(s):  
Vlatko Vedral
Keyword(s):  
Ground State ◽  
Physical System ◽  
Entangled State ◽  
Total Entropy ◽  
Many Body ◽  
Critical Temperatures ◽  
Entanglement Witness ◽  
Macroscopic Entanglement ◽  
Many Body Systems

We show that if the ground state entanglement exceeds the total entropy of a given system, then this system is in an entangled state. This is a universal entanglement witness that applies to any physical system and yields a temperature below which we are certain to find some entanglement. Our witness is then applied to generic bosonic and fermionic many-body systems to derive the corresponding "critical" temperatures that have a very broad validity.

Renilla Bioluminescence: A Morphologic Approach to the Location of Photocytes

1974 ◽  
Vol 32 ◽  
pp. 208-209
Author(s):  
Ben O. Spurlock ◽  
Milton J. Cormier
Keyword(s):  
Excited State ◽  
Ground State ◽  
Molecular Basis ◽  
Light Emission ◽  
Chemical Basis ◽  
Electronic Excited State ◽  
Colonial Form ◽  
The Common ◽  
Eighteenth And Nineteenth Centuries ◽  
Catalyzed Oxidation

The phenomenon of bioluminescence has fascinated layman and scientist alike for many centuries. During the eighteenth and nineteenth centuries a number of observations were reported on the physiology of bioluminescence in Renilla, the common sea pansy. More recently biochemists have directed their attention to the molecular basis of luminosity in this colonial form. These studies have centered primarily on defining the chemical basis for bioluminescence and its control. It is now established that bioluminescence in Renilla arises due to the luciferase-catalyzed oxidation of luciferin. This results in the creation of a product (oxyluciferin) in an electronic excited state. The transition of oxyluciferin from its excited state to the ground state leads to light emission.

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