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Artykuły w czasopismach na temat „Quantum trajectory framework”

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Data publikacji: 6 września 2023

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1

Rahmani, Faramarz, and Mehdi Golshani. "Some clarifications about the Bohmian geodesic deviation equation and Raychaudhuri’s equation." International Journal of Modern Physics A 33, no. 03 (2018): 1850027. http://dx.doi.org/10.1142/s0217751x18500276.

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One of the important and famous topics in general theory of relativity and gravitation is the problem of geodesic deviation and its related singularity theorems. An interesting subject is the investigation of these concepts when quantum effects are considered. Since the definition of trajectory is not possible in the framework of standard quantum mechanics (SQM), we investigate the problem of geodesic equation and its related topics in the framework of Bohmian quantum mechanics in which the definition of trajectory is possible. We do this in a fixed background and we do not consider the backre
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2

Mandal, Bikramaditya, Alexander Semenov, and Dmitri Babikov. "Adiabatic Trajectory Approximation within the Framework of Mixed Quantum/Classical Theory." Journal of Physical Chemistry A 124, no. 47 (2020): 9877–88. http://dx.doi.org/10.1021/acs.jpca.0c07547.

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3

Garashchuk, Sophya. "Description of Bound Reactive Dynamics within the Approximate Quantum Trajectory Framework†." Journal of Physical Chemistry A 113, no. 16 (2009): 4451–56. http://dx.doi.org/10.1021/jp8110869.

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4

Liu, Cheng-Zhou, and Qiao-Jun Cao. "Particle tunneling in a quantum corrected spacetime." Modern Physics Letters A 30, no. 02 (2015): 1550007. http://dx.doi.org/10.1142/s0217732315500078.

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Particle tunneling from a quantum corrected black hole in the gravity's rainbow was investigated by the radial trajectory method of the tunneling framework. Using the thermodynamic property of the event horizon, a simpler method for calculating the tunneling probability was shown. In this method, the Painleve coordinate transformation of spacetime and the radial trajectory equation of the tunneling particles used in the previous radial trajectory method was not used. Using the simpler method, the tunneling probability of outgoing particles, regardless of whether they are massless or massive, w
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5

BARCHIELLI, A., M. GREGORATTI, and M. LICCIARDO. "QUANTUM TRAJECTORIES, FEEDBACK AND SQUEEZING." International Journal of Quantum Information 06, supp01 (2008): 581–87. http://dx.doi.org/10.1142/s0219749908003815.

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Quantum trajectory theory is the best mathematical set up to model continual observations of a quantum system and feedback based on the observed output. Inside this framework, we study how to enhance the squeezing of the fluorescence light emitted by a two-level atom, stimulated by a coherent monochromatic laser. In the presence of a Wiseman-Milburn feedback scheme, based on the homodyne detection of a fraction of the emitted light, we analyze the squeezing dependence on the various control parameters.
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6

Beyer, Konstantin, Kimmo Luoma, Tim Lenz, and Walter T. Strunz. "Measured Composite Collision Models: Quantum Trajectory Purities and Channel Divisibility." Entropy 24, no. 5 (2022): 715. http://dx.doi.org/10.3390/e24050715.

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We investigate a composite quantum collision model with measurements on the memory part, which effectively probe the system. The framework allows us to adjust the measurement strength, thereby tuning the dynamical map of the system. For a two-qubit setup with a symmetric and informationally complete measurement on the memory, we study the divisibility of the resulting dynamics in dependence of the measurement strength. The measurements give rise to quantum trajectories of the system and we show that the average asymptotic purity depends on the specific form of the measurement. With the help of
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7

Burnett, Christopher L., Darryl D. Holm, and David M. Meier. "Inexact trajectory planning and inverse problems in the Hamilton–Pontryagin framework." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 469, no. 2160 (2013): 20130249. http://dx.doi.org/10.1098/rspa.2013.0249.

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We study a trajectory-planning problem whose solution path evolves by means of a Lie group action and passes near a designated set of target positions at particular times. This is a higher-order variational problem in optimal control, motivated by potential applications in computational anatomy and quantum control. Reduction by symmetry in such problems naturally summons methods from Lie group theory and Riemannian geometry. A geometrically illuminating form of the Euler–Lagrange equations is obtained from a higher-order Hamilton–Pontryagin variational formulation. In this context, the previou
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8

Peter, Patrick. "Using Trajectories in Quantum Cosmology." Universe 4, no. 8 (2018): 89. http://dx.doi.org/10.3390/universe4080089.

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Quantum cosmology based on the Wheeler De Witt equation represents a simple way to implement plausible quantum effects in a gravitational setup. In its minisuperspace version wherein one restricts attention to FLRW metrics with a single scale factor and only a few degrees of freedom describing matter, one can obtain exact solutions and thus acquire full knowledge of the wave function. Although this is the usual way to treat a quantum mechanical system, it turns out however to be essentially meaningless in a cosmological framework. Turning to a trajectory approach then provides an effective mea
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9

Chiribella, Giulio, and Hlér Kristjánsson. "Quantum Shannon theory with superpositions of trajectories." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 475, no. 2225 (2019): 20180903. http://dx.doi.org/10.1098/rspa.2018.0903.

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Shannon's theory of information was built on the assumption that the information carriers were classical systems. Its quantum counterpart, quantum Shannon theory, explores the new possibilities arising when the information carriers are quantum systems. Traditionally, quantum Shannon theory has focused on scenarios where the internal state of the information carriers is quantum, while their trajectory is classical. Here we propose a second level of quantization where both the information and its propagation in space–time is treated quantum mechanically. The framework is illustrated with a numbe
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10

Alipour, Sahar, Aurelia Chenu, Ali T. Rezakhani, and Adolfo del Campo. "Shortcuts to Adiabaticity in Driven Open Quantum Systems: Balanced Gain and Loss and Non-Markovian Evolution." Quantum 4 (September 28, 2020): 336. http://dx.doi.org/10.22331/q-2020-09-28-336.

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A universal scheme is introduced to speed up the dynamics of a driven open quantum system along a prescribed trajectory of interest. This framework generalizes counterdiabatic driving to open quantum processes. Shortcuts to adiabaticity designed in this fashion can be implemented in two alternative physical scenarios: one characterized by the presence of balanced gain and loss, the other involves non-Markovian dynamics with time-dependent Lindblad operators. As an illustration, we engineer superadiabatic cooling, heating, and isothermal strokes for a two-level system, and provide a protocol fo
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11

Yang, Ciann-Dong, and Shiang-Yi Han. "Extending Quantum Probability from Real Axis to Complex Plane." Entropy 23, no. 2 (2021): 210. http://dx.doi.org/10.3390/e23020210.

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Probability is an important question in the ontological interpretation of quantum mechanics. It has been discussed in some trajectory interpretations such as Bohmian mechanics and stochastic mechanics. New questions arise when the probability domain extends to the complex space, including the generation of complex trajectory, the definition of the complex probability, and the relation of the complex probability to the quantum probability. The complex treatment proposed in this article applies the optimal quantum guidance law to derive the stochastic differential equation governing a particle’s
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12

VARMA, RAM K. "Some surprising manifestations of charged particle dynamics in a magnetic field." Journal of Plasma Physics 76, no. 3-4 (2010): 355–67. http://dx.doi.org/10.1017/s0022377809990626.

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AbstractWe present here some very unusual experimental results on the dynamics of charged particle in a magnetic field which cannot be comprehended in terms of the Lorentz dynamics regarded, as per the current conceptual framework, as the appropriate one for the macro-scale description. Astonishingly, these results have been shown to be manifestations of a novel macro-scale quantum structure, designated as ‘transition amplitude wave’ (TAW), riding with the guiding centre trajectory, which is generated in the latter trajectory in consequence of the scattering of the particle with a fixed scatte
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13

Strasberg, Philipp. "Thermodynamics of Quantum Causal Models: An Inclusive, Hamiltonian Approach." Quantum 4 (March 2, 2020): 240. http://dx.doi.org/10.22331/q-2020-03-02-240.

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Operational quantum stochastic thermodynamics is a recently proposed theory to study the thermodynamics of open systems based on the rigorous notion of a quantum stochastic process or quantum causal model. In there, a stochastic trajectory is defined solely in terms of experimentally accessible measurement results, which serve as the basis to define the corresponding thermodynamic quantities. In contrast to this observer-dependent point of view, a `black box', which evolves unitarily and can simulate a quantum causal model, is constructed here. The quantum thermodynamics of this big isolated s
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14

Yang, Ciann-Dong, and Shiang-Yi Han. "Tunneling Quantum Dynamics in Ammonia." International Journal of Molecular Sciences 22, no. 15 (2021): 8282. http://dx.doi.org/10.3390/ijms22158282.

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Ammonia is a well-known example of a two-state system and must be described in quantum-mechanical terms. In this article, we will explain the tunneling phenomenon that occurs in ammonia molecules from the perspective of trajectory-based quantum dynamics, rather than the usual quantum probability perspective. The tunneling of the nitrogen atom through the potential barrier in ammonia is not merely a probability problem; there are underlying reasons and mechanisms explaining why and how the tunneling in ammonia can happen. Under the framework of quantum Hamilton mechanics, the tunneling motion o
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15

Brizuela, David, and Tomasz Pawłowski. "Quantum fluctuations and semiclassicality in an inflaton-driven evolution." Journal of Cosmology and Astroparticle Physics 2022, no. 10 (2022): 080. http://dx.doi.org/10.1088/1475-7516/2022/10/080.

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Abstract A semiclassical description of quantum systems is applied to probe the dynamics of the cosmological model of an inflationary universe with quadratic inflaton potential, described in a quantum framework of geometrodynamics. The systematic analysis, focusing in particular on the inflationary and post-inflationary epochs, revealed several surprising and counterintuitive features: (i) during inflation the universe rapidly spreads out in volume which leads to significant relative variance by the end of inflation; (ii) despite that, the quantum evolution can still be described to high accur
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16

Tessarotto, Massimo, and Claudio Cremaschini. "Role of Quantum Entropy and Establishment of H-Theorems in the Presence of Graviton Sinks for Manifestly-Covariant Quantum Gravity." Entropy 21, no. 4 (2019): 418. http://dx.doi.org/10.3390/e21040418.

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Based on the introduction of a suitable quantum functional, identified here with the Boltzmann–Shannon entropy, entropic properties of the quantum gravitational field are investigated in the framework of manifestly-covariant quantum gravity theory. In particular, focus is given to gravitational quantum states in a background de Sitter space-time, with the addition of possible quantum non-unitarity effects modeled in terms of an effective quantum graviton sink localized near the de Sitter event horizon. The theory of manifestly-covariant quantum gravity developed accordingly is shown to retain
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17

Huang, Jung-Jeng. "Bohm Quantum Trajectories of Scalar Field in Trans-Planckian Physics." Advances in High Energy Physics 2012 (2012): 1–19. http://dx.doi.org/10.1155/2012/312841.

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In lattice Schrödinger picture, we investigate the possible effects of trans-Planckian physics on the quantum trajectories of scalar field in de Sitter space within the framework of the pilot-wave theory of de Broglie and Bohm. For the massless minimally coupled scalar field and the Corley-Jacobson type dispersion relation with sextic correction to the standard-squared linear relation, we obtain the time evolution of vacuum state of the scalar field during slow-roll inflation. We find that there exists a transition in the evolution of the quantum trajectory from well before horizon exit to wel
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18

IHM, JISOON. "BROKEN TIME-REVERSAL SYMMETRY AND BERRY’S PHASE." International Journal of Modern Physics B 07, no. 11 (1993): 2109–46. http://dx.doi.org/10.1142/s0217979293002808.

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Berry’s phase is typically realized in a system consisting of fast and slow variables, when the trajectory of the slow variable makes a closed loop. The quantum mechanical phase picked up by the fast variable while the slow variable traverses the loop has turned out to produce real physical effects through quantum interference. In this article, we investigate origins of Berry’s geometric phase and show that they are in general attributable to the broken time-reversal symmetry of the system. Our analysis leads to the classification of Berry’s phase for Hamiltonian systems in terms of symmetry p
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19

Villaseco Arribas, Evaristo, Federica Agostini, and Neepa T. Maitra. "Exact Factorization Adventures: A Promising Approach for Non-Bound States." Molecules 27, no. 13 (2022): 4002. http://dx.doi.org/10.3390/molecules27134002.

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Modeling the dynamics of non-bound states in molecules requires an accurate description of how electronic motion affects nuclear motion and vice-versa. The exact factorization (XF) approach offers a unique perspective, in that it provides potentials that act on the nuclear subsystem or electronic subsystem, which contain the effects of the coupling to the other subsystem in an exact way. We briefly review the various applications of the XF idea in different realms, and how features of these potentials aid in the interpretation of two different laser-driven dissociation mechanisms. We present a
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20

Hucul, D., M. Yeo, W. K. Hensinger, J. Rabchuk, S. Olmschenk, and C. Monroe. "On the transport of atomic ions in linear and multidimensional ion trap arrays." Quantum Information and Computation 8, no. 6&7 (2008): 501–78. http://dx.doi.org/10.26421/qic8.6-7-1.

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Trapped atomic ions have become one of the most promising architectures for a quantum computer, and current effort is now devoted to the transport of trapped ions through complex segmented ion trap structures in order to scale up to much larger numbers of trapped ion qubits. This paper covers several important issues relevant to ion transport in any type of complex multidimensional rf (Paul) ion trap array. We develop a general theoretical framework for the application of time-dependent electric fields to shuttle laser-cooled ions along any desired trajectory, and describe a method for determi
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21

Sukker, Ghader M., Nuha Wazzan, Ashour Ahmed, and Rifaat Hilal. "Conformation and electronic structure of Carbidopa. A QM/MD study." Journal of Theoretical and Computational Chemistry 15, no. 01 (2016): 1650002. http://dx.doi.org/10.1142/s0219633616500024.

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Carbidopa (CD) is a drug used in combination with L-dopa (LD) in treatment of Parkinson’s disease (PD). CD is an inhibitor for enzyme decarboxylase, yet its mode of action is not entirely known although it is believed to involve enzyme shape recognition. The present work attempts to investigate the conformational preferences of CD. Tight geometry optimization at the density functional theory (DFT)/B3LYP/6-311[Formula: see text]G** level of theory has been carried out. The shallow nature of the potential energy surface (PES) and the presence of several local minima within a small energy range n
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22

Yu, Wenjing, Zi Li, Yuting Peng, et al. "Controlling Achiral and Chiral Properties with an Electric Field: A Next-Generation QTAIM Interpretation." Symmetry 14, no. 10 (2022): 2075. http://dx.doi.org/10.3390/sym14102075.

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We used the recently introduced stress tensor trajectory Uσ space construction within the framework of next-generation quantum theory of atoms in molecules (NG-QTAIM) for a chirality investigation of alanine when subjected to a non-structurally distorting electric field. The resultant sliding of the axial-bond critical point (BCP) responded significantly, up to twice as much, in the presence of the applied electric field in comparison to its absence. The bond flexing, a measure of bond strain, was always lower by up to a factor of four in the presence of the electric field, depending on its di
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23

Alamro, Hayam, Hamed Alqahtani, Fahad F. Alruwaili, Sumayh S. Aljameel, and Mohammed Rizwanullah. "Blockchain with Quantum Mayfly Optimization-Based Clustering Scheme for Secure and Smart Transport Systems." Sustainability 15, no. 15 (2023): 11782. http://dx.doi.org/10.3390/su151511782.

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Blockchain (BC) with a clustering scheme can be used to build secure and smart Vehicular Ad-Hoc Networks (VANETs), which provide improved data integrity, enhanced security, efficient resource allocation, and streamlined processes. This technology has revolutionized the transport industry by enabling safer, more efficient, and transparent transportation networks. Therefore, this paper concentrates on the design of a new Blockchain with a Quantum Mayfly Optimization-based Clustering Scheme for Secure and Smart Transport Systems (BQMFO-CSSTS) technique. The objective of the presented BQMFO-CSSTS
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24

PRIGOGINE, ILYA. "WHY IRREVERSIBILITY? THE FORMULATION OF CLASSICAL AND QUANTUM MECHANICS FOR NONINTEGRABLE SYSTEMS." International Journal of Bifurcation and Chaos 05, no. 01 (1995): 3–16. http://dx.doi.org/10.1142/s0218127495000028.

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Nonintegrable Poincaré systems with continuous spectrum (so-called Large Poincaré Systems, LPS) lead to the appearance of diffusive terms in the framework of dynamics. These terms break time symmetry. They lead, therefore, to limitations to classical trajectory dynamics and of wave functions. These diffusive terms correspond to well-defined classes of dynamical processes (i.e., so-called “vacuum-vacuum” transitions). The diffusive effects are amplified in situations corresponding to persistent interactions. As a result, we have to include already in the fundamental dynamical description the tw
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25

George, Babu, and Ontario Wooden. "Managing the Strategic Transformation of Higher Education through Artificial Intelligence." Administrative Sciences 13, no. 9 (2023): 196. http://dx.doi.org/10.3390/admsci13090196.

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Considering the rapid advancements in artificial intelligence (AI) and their potential implications for the higher education sector, this article seeks to critically evaluate the strategic adoption of AI in the framework of “smart universities”. We envisage these innovative institutions as the imminent evolution in higher education, harnessing AI and quantum technologies to reshape academic and administrative processes. The core presumption is that through such integration, universities can achieve personalized learning trajectories, enhanced accessibility, economic efficiency, and a boost in
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26

Ivanov S.V. "Broadening and shifting of the carbon monoxide rotational lines in a wide temperature range: calculations in the framework of the classical impact theory for CO-He." Optics and Spectroscopy 130, no. 12 (2022): 1508. http://dx.doi.org/10.21883/eos.2022.12.55235.4144-22.

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The classical impact theory of Gordon is used to calculate half-widths and shifts of spectral lines of the pure rotational band of 12C16O isotopologue broadened by He. Two rotational transitions are examined: J=0-> J=1 and J=1-> J=2 in the wide temperature range from 1.3 to 600 K. The main purpose of this work is the study of the validity limits of classical impact theory at low temperatures. Dynamical calculations were performed on the accurate CO-He ab initio potential energy surface. The results of calculations are in good agreement with experimental data with the exception of
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27

Chough, Young-Tak. "Fock state interference: A fast computation and an analytic treatment in the frameworkof the quantum trajectory theory." Physical Review A 55, no. 4 (1997): 3143–54. http://dx.doi.org/10.1103/physreva.55.3143.

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28

Ayala Oña, Roger I., Darya P. Kislyakova, and Tatyana P. Shestakova. "On the Appearance of Time in the Classical Limit of Quantum Gravity." Universe 9, no. 2 (2023): 85. http://dx.doi.org/10.3390/universe9020085.

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A possible solution of the problem of time in the Wheeler–DeWitt quantum geometrodynamics is that time appears within a semiclassical limit. Following this line of thinking, one can come to the Schrodinger equation for matter fields in curved spacetime with quantum-gravitational corrections. In the present paper, we study the semiclassical limit in the case of a closed isotropic model with a scalar field decomposed into modes. We analyse calculations made within frameworks of three approaches. The first approach was proposed by Kiefer and Singh. Since the Wheeler–DeWitt equation does not conta
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29

Bockler, Jessica. "Presencing with Soul." Journal of Awareness-Based Systems Change 1, no. 1 (2021): 15–33. http://dx.doi.org/10.47061/jabsc.v1i1.471.

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In his outline of Theory U, an awareness-based social change methodology, Scharmer (2018) depicts seven stages of presencing which he suggests can enable deeper modes of perception and knowing, to help us actualise our highest potential for social, economic, and cultural renewal. In this paper I attempt to shine a deeper light into the seven stages of presencing, by drawing from the fields of transpersonal psychology, quantum physics, and consciousness studies. In doing so, my objective is to operationalise in psychological terms key processes in presencing, such as “letting go”, letting come”
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30

Donvil, Brecht, and Paolo Muratore-Ginanneschi. "Quantum trajectory framework for general time-local master equations." Nature Communications 13, no. 1 (2022). http://dx.doi.org/10.1038/s41467-022-31533-8.

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AbstractMaster equations are one of the main avenues to study open quantum systems. When the master equation is of the Lindblad–Gorini–Kossakowski–Sudarshan form, its solution can be “unraveled in quantum trajectories” i.e., represented as an average over the realizations of a Markov process in the Hilbert space of the system. Quantum trajectories of this type are both an element of quantum measurement theory as well as a numerical tool for systems in large Hilbert spaces. We prove that general time-local and trace-preserving master equations also admit an unraveling in terms of a Markov proce
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31

Svensson, Pontus, Thomas Campbell, Frank Graziani, et al. "Development of a new quantum trajectory molecular dynamics framework." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 381, no. 2253 (2023). http://dx.doi.org/10.1098/rsta.2022.0325.

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An extension to the wave packet description of quantum plasmas is presented, where the wave packet can be elongated in arbitrary directions. A generalized Ewald summation is constructed for the wave packet models accounting for long-range Coulomb interactions and fermionic effects are approximated by purpose-built Pauli potentials, self-consistent with the wave packets used. We demonstrate its numerical implementation with good parallel support and close to linear scaling in particle number, used for comparisons with the more common wave packet employing isotropic states. Ground state and ther
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32

Li, Guijie, Cancan Shao, Jiabo Xu, and Linjun Wang. "A Unified Framework of Mixed Quantum-Classical Dynamics with Trajectory Branching." Journal of Chemical Physics, November 10, 2022. http://dx.doi.org/10.1063/5.0125438.

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As popular mixed quantum-classical dynamics methods, trajectory surface hopping (TSH) and Ehrenfest mean field (EMF) have been widely utilized to simulate nonadiabatic dynamics. Recently, we have proposed the branching corrected surface hopping (BCSH) and the branching corrected mean field (BCMF) methods, both of which closely reproduce the exact quantum dynamics in a series of standard scattering models. Here, the mixed surface hopping and mean field with branching correction (BCSHMF) is presented as a unified framework of mixed quantum-classical dynamics. As benchmarked in thousands of diver
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Chakraborty, Madhukrishna, and Subenoy Chakraborty. "The classical and quantum implications of the Raychaudhuri Equation in f(T)-gravity." Classical and Quantum Gravity, June 27, 2023. http://dx.doi.org/10.1088/1361-6382/ace231.

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Abstract The present work deals with the classical and quantum aspects of the Raychaudhuri equation in the framework of f(T)-gravity theory. In the background of homogeneous and isotropic Friedmann–Lemaître–Robertson-Walker space-time, the Raychaudhuri equation has been formulated and used to examine the focusing theorem and convergence condition for different choices of f(T). Finally in quantum cosmology, the wave function of the universe has been shown to be the energy eigen function of the time-independent Schrödinger equation of a particle. Also probability measure on the mini-superspace h
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34

Hayashi, Yasuhiro, Takahiro Ogino, Tadakatsu Sakai, and Shigeki Sugimoto. "Stringy excited baryons in holographic quantum chromodynamics." Progress of Theoretical and Experimental Physics 2020, no. 5 (2020). http://dx.doi.org/10.1093/ptep/ptaa045.

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Abstract We analyze excited baryon states using a holographic dual of quantum chromodynamics that is defined on the basis of an intersecting D4/D8-brane system. Studies of baryons in this model have been made by regarding them as a topological soliton of a gauge theory on a five-dimensional curved spacetime. However, this allows one to obtain only a certain class of baryons. We attempt to present a framework such that a whole set of excited baryons can be treated in a systematic way. This is achieved by employing the original idea of Witten, which states that a baryon is described by a system
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35

Choudhury, Sayantan, Ankan Dutta, and Debisree Ray. "Chaos and complexity from quantum neural network. A study with diffusion metric in machine learning." Journal of High Energy Physics 2021, no. 4 (2021). http://dx.doi.org/10.1007/jhep04(2021)138.

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Abstract In this work, our prime objective is to study the phenomena of quantum chaos and complexity in the machine learning dynamics of Quantum Neural Network (QNN). A Parameterized Quantum Circuits (PQCs) in the hybrid quantum-classical framework is introduced as a universal function approximator to perform optimization with Stochastic Gradient Descent (SGD). We employ a statistical and differential geometric approach to study the learning theory of QNN. The evolution of parametrized unitary operators is correlated with the trajectory of parameters in the Diffusion metric. We establish the p
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36

Koessler, Eric R., Arkajit Mandal, and Pengfei Huo. "Incorporating Lindblad Decay Dynamics into Mixed Quantum-Classical Simulations." Journal of Chemical Physics, July 4, 2022. http://dx.doi.org/10.1063/5.0099922.

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We derive the $\mathcal{L}$-MFE method to incorporate Lindblad jump operator dynamics into the mean-field Ehrenfest (MFE) approach. We map the density matrix evolution of Lindblad dynamics onto pure state coefficients using trajectory averages. We use simple assumptions to construct the $\mathcal{L}$-MFE method that satisfies this exact mapping. This establishes a method that uses independent trajectories which exactly reproduces Lindblad decay dynamics using a wavefunction description, with deterministic changes of the magnitudes of the quantum expansion coefficients, while only adding on a s
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37

Ullah, Arif, and Pavlo O. Dral. "Predicting the future of excitation energy transfer in light-harvesting complex with artificial intelligence-based quantum dynamics." Nature Communications 13, no. 1 (2022). http://dx.doi.org/10.1038/s41467-022-29621-w.

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AbstractExploring excitation energy transfer (EET) in light-harvesting complexes (LHCs) is essential for understanding the natural processes and design of highly-efficient photovoltaic devices. LHCs are open systems, where quantum effects may play a crucial role for almost perfect utilization of solar energy. Simulation of energy transfer with inclusion of quantum effects can be done within the framework of dissipative quantum dynamics (QD), which are computationally expensive. Thus, artificial intelligence (AI) offers itself as a tool for reducing the computational cost. Here we suggest AI-QD
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38

Amati, Graziano, Johan Erik Runeson, and Jeremy O. Richardson. "On detailed balance in nonadiabatic dynamics: From spin spheres to equilibrium ellipsoids." Journal of Chemical Physics, January 19, 2023. http://dx.doi.org/10.1063/5.0137828.

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Trajectory-based methods that propagate classical nuclei on multiple quantum electronic states are often used to simulate nonadiabatic processes in the condensed phase. A long-standing problem of these methods is their lack of detailed balance, meaning that they do not conserve the equilibrium distribution. In this article, we investigate ideas for how to restore detailed balance in mixed quantum-classical systems by tailoring the previously proposed spin-mapping approach to thermal equilibrium. We find that adapting the spin magnitude can recover the correct long-time populations but is insuf
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39

Mannouch, Jonathan Richard, and Jeremy O. Richardson. "A mapping approach to surface hopping." Journal of Chemical Physics, February 20, 2023. http://dx.doi.org/10.1063/5.0139734.

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We present a nonadiabatic classical-trajectory approach that offers the best of both worlds between fewest-switches surface hopping (FSSH) and quasiclassical mapping dynamics. This mapping approach to surface hopping (MASH) propagates the nuclei on the active adiabatic potential-energy surface, like in FSSH. However, unlike in FSSH, transitions between active surfaces are deterministic and occur when the electronic mapping variables evolve between specified regions of the electronic phase space. This guarantees internal consistency between the active surface and the electronic degrees of freed
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40

Vancea, Ion. "Semiclassical bosonic D-brane boundary states in curved spacetime." Open Physics 8, no. 1 (2010). http://dx.doi.org/10.2478/s11534-009-0084-y.

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AbstractIn this paper we discuss the existence of quantum D-brane states in the strong gravitational field and in the presence of a constant Kalb-Ramond field. A semiclassical string quantization method in which the spacetime metric g AB and the constant antisymmetric Kalb-Ramond field b AB are treated exactly is employed. In this framework, the semiclassical D-branes are defined at the first order perturbation around the trajectory of the center-of-mass of a string. The set of equations the semiclassical D-branes must satisfy in a general strong gravitational field are given. These equations
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