20 papers · ranked by Valyu relevance
Frank Trixler
Quantum tunnelling is a phenomenon which becomes relevant at the nanoscale and below. It is a paradox from the classical point of view as it enables elementary particles and atoms to permeate an energetic barrier without the need for sufficient energy to overcome it. Tunnelling might seem to be an exotic process only…
Cornelia Hofmann, Alexander Bray, Werner Koch, Hongcheng Ni + 1 more
'Nikolay I. Shvetsov-Shilovski'] Abstract What is the nature of tunnelling? This yet unanswered question is as pertinent today as it was at the dawn of quantum mechanics. This article presents a cross section of current perspectives on the interpretation, computational modelling, and numerical investigation of…
Yin Long Lin, Oscar Dahlsten
We consider in what sense quantum tunnelling is associated with non-classical probabilistic behaviour. We use the Wigner function quasi-probability description of quantum states. We give a definition of tunnelling that allows us to say whether in a given scenario there is tunnelling or not. We prove that this can only…
Ji‐Yong Sung, Jae‐Ho Cheong
2.2.1#### Definition and mechanisms Quantum tunnelling occurs when a particle passes through an energy barrier higher than its classical kinetic energy would allow. In biology, tunnelling has been implicated for both electrons and protons, influencing enzymatic catalysis, respiration and proton-transfer-mediated…
Khemendra Shukla, Po-Sung Chen, Jun-Ren Chen, Yu-Hsuan Chang + 1 more
'Yiwei Liu'] Quantum tunnelling is a phenomenon of non-equilibrium quantum dynamics and its detailed process is largely unexplored. We report the experimental observation of macroscopic quantum tunnelling of Bose-Einstein condensate in a hybrid trap. By exerting a nonadiabatic kick to excite a collective rotation mode…
D. Sokolovski, E. Akhmatskaya
A controversy surrounding the “tunnelling time problem” stems from the seeming inability of quantum mechanics to provide, in the usual way, a definition of the duration a particle is supposed to spend in a given region of space. For this reason, the problem is often approached from an “operational” angle. Typically…
R. Zielinski, C. Simenel, Patrick McGlynn
diagram summation Authors: ['R. Zielinski' 'C. Simenel' 'Patrick McGlynn'] Currently there is no general theory of quantum tunnelling of a particle through a potential barrier which is compatible with QFT. We present a complete calculation of tunnelling amplitudes for a scalar field for some simple potentials using…
Atsushi Noguchi, Yutaka Shikano, Kenji Toyoda, Shinji Urabe
Quantum tunnelling is a common fundamental quantum-mechanical phenomenon that originates from the wave-like characteristics of quantum particles. Although the quantum-tunnelling effect was first observed 85 years ago, some questions regarding the dynamics of quantum tunnelling remain unresolved. Here, we realise a…
S. E. Ennadifi
Prompted by the longstanding interpretational controversy in quantum mechanics, quantum tunneling is heuristically addressed within the Everettian quantum multiverse. In this framework, the universal wavefunction splits into decohered reflected and transmitted branches under the environmetal effect after encountring a…
Samuel L. Rudge, Daniel S. Kosov
In electron transport, the tunnelling time is the time taken for an electron to tunnel out of a system after it has tunnelled in. We define the tunnelling time distribution for quantum processes in a dissipative environment and develop a practical approach for calculating it, where the environment is described by the…
F. Wang, M. T. Greenaway, A. G. Balanov, T. M. Fromhold
We investigate the quantum-classical correspondence for a particle tunnelling through a periodic superlattice structure with an applied bias voltage and an additional tilted harmonic oscillator potential. We show that the quantum mechanical tunnelling rate between neighbouring quantum wells of the superlattice is…
Louie Slocombe, Jim Al-Khalili, Marco Sacchi
The misincorporation of a non-complimentary DNA base in the polymerase active site is a critical source of replication errors that can lead to genetic mutations. In this work, we model the mechanism of wobble mispairing and the subsequent rate of misincorporation errors by coupling first-principles quantum chemistry…
Unmesh Mondal, Ivan Girotto, Ali Hassanali, Prasenjit Ghosh
Double proton transfers (DPT) are important for several physical processes, both in molecules and in the condensed phase. While these have been widely studied in biological systems, their study in crystalline environments is rare. In this work, using Path Integral Molecular Dynamics simulations we have studied…
Akhil Jain, Jonathan Gosling, Shaochuang Liu, Haowei Wang + 9 more
Quantum biological electron tunnelling (QBET) underpins cellular behaviour. Control of electrical-molecular communication could revolutionise the development of disruptive technologies for understanding and modulating molecular signalling. Current communication technology is not appropriate for interfacing with cells…
Takeshi Yasuda, Nakako Nakajima, Tomoko Yanaka, Takaya Gotoh + 3 more
Quantum tunneling is a phenomenon in which small quantum particles pass through a reaction energy barrier, as if they were passing through a tunnel opened in the barrier. In this study, we analyzed the involvement of the quantum tunneling effect in enzymatic chemical reactions involving hydrolysis in vitro, by…
Daniele Romanello, Andrea Romanello
This study presents the hypothesis that triosephosphate isomerase (TIM), a pivotal enzyme in glycolysis, functions as a quantum logic gate. Utilizing quantum mechanics, we model TIM’s catalytic conversion of dihydroxyacetone phosphate (DHAP) to glyceraldehyde-3-phosphate (G3P) as a quantum operation involving precise…
Ashar J. Malik, David B. Ascher
Accurately modelling the potential energy landscapes that govern molecular interactions is a central challenge in computational biophysics. While quantum computers promise to solve such problems with high fidelity, a key bottleneck is the encoding of complex spatial information into low-qubit Hamiltonians suitable for…
Alan Tai
This study presents a quantum well model using transfer matrix to analyse the charge transfer characteristic in DNA nanostructure sequences. The unconfined state or unbound state above the quantum well are used to investigate the carrier behaviours in nanostructure of semiconductor. Similar analysis and simulations can…
Luyi Han, Yue Wan, Zhenxi Guo, Shuo Gao + 2 more
Nanocondensates occupy mesoscopic scale in both spatial scale and thermodynamic state, and the mesoscopic scale is central to structure-function conversion in living systems. However, how the dual mesoscopic properties of nanocondensates support biological function remains unclear because their small size and rapid…
Francesco Talotta, David Lauvergnat, Federica Agostini
The exact factorization of the electron-nuclear wavefunction is applied to the study of the photo- isomerization of a retinal chromophore model. We describe such an ultrafast nonadiabatic process by analyzing the time-dependent potentials of the theory and by mimicking nuclear dynamics with quantum and coupled…