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Erschienen in: Programming and Computer Software 4/2022

01.08.2022

Decomposition of a Finite Quantum System into Subsystems: Symbolic–Numerical Approach

verfasst von: V. V. Kornyak

Erschienen in: Programming and Computer Software | Ausgabe 4/2022

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Abstract

Any Hilbert space with composite dimension can be represented as a tensor product of Hilbert spaces of lower dimensions. This factorization makes it possible to decompose a quantum system into subsystems. We propose a model based on finite quantum mechanics for the constructive study of decompositions of an isolated quantum system into subsystems. To study the behavior of the composite systems resulting from the decompositions, we develop algorithms based on methods of computer algebra and computational group theory.

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Fußnoten
1
In the strict sense, only the universe as a whole can be a closed system; otherwise, the concept of a closed system is approximate.
 
2
Another approach whereby the factorization of the Hilbert space is given by the algebra of observables was proposed in [5, 6].
 
3
This is a manifestation of Occam’s razor, expressed by the metaphor “the church of the larger Hilbert space” (J.A. Smolin); it allows one to obtain probabilities of all types that occur in quantum theory from the only fundamental probability that appears in Gleason’s theorem [8] and corresponds to Born’s rule.
 
4
Accurate to empirically insignificant elements of the traditional formalism, mainly infinities of various kinds.
 
5
This term is motivated by the physical term “ground state of a quantum-mechanical system.”
 
6
Based on the current cosmological data, \(\mathcal{N} \sim {\text{Exp}}\left( {{\text{Exp}}\left( {20} \right)} \right)\) for 1 cm3 of matter and \(\mathcal{N} \sim {\text{Exp}}\left( {{\text{Exp}}\left( {123} \right)} \right)\) for the entire universe.
 
7
In [13], the exact lower bound \(\mathcal{N} \geqslant 72\) was found.
 
8
The need for complex numbers (nontrivial elements of cyclotomic extensions) can arise only in problems that involve certain proper subgroups of the symmetric group \({{{\text{S}}}_{\mathcal{N}}}\). A typical example is cyclic groups the irreducible representations of which (except for \({{Z}_{2}} \simeq {{S}_{2}}\)) cannot be obtained without complex numbers.
 
9
Obviously, it would be more adequate to compute energy distribution for a given individual permutational evolution; however, this is a more complicated combinatorial problem.
 
Literatur
7.
Zurück zum Zitat Nielsen, M.A. and Chuang, I.L., Quantum Computation and Quantum Information, Cambridge University Press, 2016, 10th ed.MATH Nielsen, M.A. and Chuang, I.L., Quantum Computation and Quantum Information, Cambridge University Press, 2016, 10th ed.MATH
8.
Zurück zum Zitat Gleason, A.M., Measures on the closed subspaces of a Hilbert space, J. Math. Mech., 1957, vol. 6, no. 6, pp. 885–893. http://www.jstor.org/stable/24900629.MathSciNetMATH Gleason, A.M., Measures on the closed subspaces of a Hilbert space, J. Math. Mech., 1957, vol. 6, no. 6, pp. 885–893. http://​www.​jstor.​org/​stable/​24900629.​MathSciNetMATH
11.
Zurück zum Zitat Kornyak, V.V., Mathematical modeling of finite quantum systems, Lect. Notes Comput. Sci., 2012, vol. 7125, pp. 79–93.CrossRef Kornyak, V.V., Mathematical modeling of finite quantum systems, Lect. Notes Comput. Sci., 2012, vol. 7125, pp. 79–93.CrossRef
12.
Zurück zum Zitat Banks, T., Finite deformations of quantum mechanics, 2020. Banks, T., Finite deformations of quantum mechanics, 2020.
14.
Zurück zum Zitat Rényi, A., On measures of entropy and information, Proc. 4th Berkeley Symp. Math. Stat. Probab., 1961, vol. 1, pp. 547–561. Rényi, A., On measures of entropy and information, Proc. 4th Berkeley Symp. Math. Stat. Probab., 1961, vol. 1, pp. 547–561.
15.
Zurück zum Zitat Van Raamsdonk, M., Building up spacetime with quantum entanglement, Gen. Rel. Grav., 2010, vol. 42, pp. 2323–2329.MathSciNetCrossRef Van Raamsdonk, M., Building up spacetime with quantum entanglement, Gen. Rel. Grav., 2010, vol. 42, pp. 2323–2329.MathSciNetCrossRef
Metadaten
Titel
Decomposition of a Finite Quantum System into Subsystems: Symbolic–Numerical Approach
verfasst von
V. V. Kornyak
Publikationsdatum
01.08.2022
Verlag
Pleiades Publishing
Erschienen in
Programming and Computer Software / Ausgabe 4/2022
Print ISSN: 0361-7688
Elektronische ISSN: 1608-3261
DOI
https://doi.org/10.1134/S0361768822020062

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