Article (Scientific journals)
Constructing Dynamical Symmetries for Quantum Computing: Applications to Coherent Dynamics in Coupled Quantum Dots.
Hamilton, James; Levine, Raphael D; Remacle, Françoise
2024In Nanomaterials, 14 (24), p. 2056
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Keywords :
CdSe nanoparticle dimers; Lie algebra; coherent quantum dynamics; computing by observables; Chemical Engineering (all); Materials Science (all)
Abstract :
[en] Dynamical symmetries, time-dependent operators that almost commute with the Hamiltonian, extend the role of ordinary symmetries. Motivated by progress in quantum technologies, we illustrate a practical algebraic approach to computing such time-dependent operators. Explicitly we expand them as a linear combination of time-independent operators with time-dependent coefficients. There are possible applications to the dynamics of systems of coupled coherent two-state systems, such as qubits, pumped by optical excitation and other addressing inputs. Thereby, the interaction of the system with the excitation is bilinear in the coherence between the two states and in the strength of the time-dependent excitation. The total Hamiltonian is a sum of such bilinear terms and of terms linear in the populations. The terms in the Hamiltonian form a basis for Lie algebra, which can be represented as coupled individual two-state systems, each using the population and the coherence between two states. Using the factorization approach of Wei and Norman, we construct a unitary quantum mechanical evolution operator that is a factored contribution of individual two-state systems. By that one can accurately propagate both the wave function and the density matrix with special relevance to quantum computing based on qubit architecture. Explicit examples are derived for the electronic dynamics in coupled semi-conducting nanoparticles that can be used as hardware for quantum technologies.
Disciplines :
Chemistry
Author, co-author :
Hamilton, James ;  Université de Liège - ULiège > Département de chimie (sciences) > Laboratoire de chimie physique théorique ; Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
Levine, Raphael D;  Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel ; Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA 90095, USA ; Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, CA 90095, USA
Remacle, Françoise  ;  Université de Liège - ULiège > Département de chimie (sciences) > Laboratoire de chimie physique théorique ; Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
Language :
English
Title :
Constructing Dynamical Symmetries for Quantum Computing: Applications to Coherent Dynamics in Coupled Quantum Dots.
Publication date :
23 December 2024
Journal title :
Nanomaterials
eISSN :
2079-4991
Publisher :
Multidisciplinary Digital Publishing Institute (MDPI), Switzerland
Volume :
14
Issue :
24
Pages :
2056
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fund for Scientific Research
Funding number :
T0205.20
Funding text :
FR and JRH acknowledge the support of the Fonds National de la Recherche (F.R.S.-FNRS, Belgium), #T0205.20.
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