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Article

Quantum Information in Neural Systems

Institute for Advanced Study, 30 Vasilaki Papadopulu Str., 9010 Varna, Bulgaria
Academic Editor: Wiesław Leonski
Symmetry 2021, 13(5), 773; https://doi.org/10.3390/sym13050773
Received: 23 March 2021 / Revised: 16 April 2021 / Accepted: 19 April 2021 / Published: 29 April 2021
(This article belongs to the Special Issue Quantum Information Applied in Neuroscience)
Identifying the physiological processes in the central nervous system that underlie our conscious experiences has been at the forefront of cognitive neuroscience. While the principles of classical physics were long found to be unaccommodating for a causally effective consciousness, the inherent indeterminism of quantum physics, together with its characteristic dichotomy between quantum states and quantum observables, provides a fertile ground for the physical modeling of consciousness. Here, we utilize the Schrödinger equation, together with the Planck–Einstein relation between energy and frequency, in order to determine the appropriate quantum dynamical timescale of conscious processes. Furthermore, with the help of a simple two-qubit toy model we illustrate the importance of non-zero interaction Hamiltonian for the generation of quantum entanglement and manifestation of observable correlations between different measurement outcomes. Employing a quantitative measure of entanglement based on Schmidt decomposition, we show that quantum evolution governed only by internal Hamiltonians for the individual quantum subsystems preserves quantum coherence of separable initial quantum states, but eliminates the possibility of any interaction and quantum entanglement. The presence of non-zero interaction Hamiltonian, however, allows for decoherence of the individual quantum subsystems along with their mutual interaction and quantum entanglement. The presented results show that quantum coherence of individual subsystems cannot be used for cognitive binding because it is a physical mechanism that leads to separability and non-interaction. In contrast, quantum interactions with their associated decoherence of individual subsystems are instrumental for dynamical changes in the quantum entanglement of the composite quantum state vector and manifested correlations of different observable outcomes. Thus, fast decoherence timescales could assist cognitive binding through quantum entanglement across extensive neural networks in the brain cortex. View Full-Text
Keywords: brain cortex; conscious experience; quantum coherence; quantum entanglement; quantum interaction brain cortex; conscious experience; quantum coherence; quantum entanglement; quantum interaction
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MDPI and ACS Style

Georgiev, D.D. Quantum Information in Neural Systems. Symmetry 2021, 13, 773. https://doi.org/10.3390/sym13050773

AMA Style

Georgiev DD. Quantum Information in Neural Systems. Symmetry. 2021; 13(5):773. https://doi.org/10.3390/sym13050773

Chicago/Turabian Style

Georgiev, Danko D. 2021. "Quantum Information in Neural Systems" Symmetry 13, no. 5: 773. https://doi.org/10.3390/sym13050773

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