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Wyświetlanie 1-15 z 31
Tytuł:
Independent quantum systems and the associativity of the product of quantum observables
Autorzy:
Fredenhagen, Klaus
Powiązania:
https://bibliotekanauki.pl/articles/690834.pdf
Data publikacji:
2019
Wydawca:
Copernicus Center Press
Tematy:
quantum systems
quantum observables
Opis:
We start from the assumption that the real valued observables of a quantum system form a Jordan algebra which is equipped with a compatible Lie product characterizing infinitesimal symmetries, and ask whether two such systems can be considered as independent subsystems of a larger system. We show that this is possible if and only if the associator of the Jordan product is a fixed multiple of the associator of the Lie product. In this case it is known that the two products can be combined to an associative product in the Jordan algebra or its complexification, depending on the sign of the multiple.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2019, 66; 61-72
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Does the quantum mechanical wave function exist?
Autorzy:
Kiefer, Claus
Powiązania:
https://bibliotekanauki.pl/articles/690936.pdf
Data publikacji:
2019
Wydawca:
Copernicus Center Press
Tematy:
wave function
quantum mechanics
ontology
quantum formalism
superposition principle
measurement problem
decoherence
quantum gravity
Opis:
I address the question whether the wave function in quantum theory exists as a real (ontic) quantity or not. For this purpose, I discuss the essentials of the quantum formalism and emphasize the central role of the superposition principle. I then explain the measurement problem and discuss the process of decoherence. Finally, I address the special features that the quantization of gravity brings into the game. From all of this I conclude that the wave function really exists, that is, it is a real (ontic) feature of Nature.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2019, 66; 111-128
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum mechanics of identical particles
Autorzy:
Kuś, Marek
Powiązania:
https://bibliotekanauki.pl/articles/2140652.pdf
Data publikacji:
2022-11-08
Wydawca:
Copernicus Center Press
Tematy:
quantum identical particle
indiscernibility
Leibniz Principle
Opis:
Leibniz’s principium identitatis indiscernibilium excludes the existence of two different objects possessing all properties identical. Although perfectly acceptable for macroscopic systems, it becomes questionable in quantum mechanics, where the concept of identical particles is quite natural and has measurable consequences. On the other hand, Leibniz’s principle seems to be indispensable when we want to individuate an item and ascribe to it particular property (e.g. value of the projection of spin on a chosen axis). We may thus abandon the principle on the quantum level, claiming it falsity here, or (better) try to find other ways of individuation of objects, possibly by adopting appropriately the very concept of it. All these problems, and many other connected with identity and indiscernibility of quantum objects, are thoroughly discussed in the book of Tomasz Bigaj, unique in the world literature due to its comprehensiveness.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2022, 72; 169-178
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jedyna tajemnica mechaniki kwantowej
The only mystery of quantum mechanics
Autorzy:
Pabjan, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/690564.pdf
Data publikacji:
2013
Wydawca:
Copernicus Center Press
Tematy:
philosophy of physics
philosophy of quantum mechanics
double-slit experiment
quantum mechanical phenomena
Opis:
The double slit experiment is a relatively simple physical test that can be useful for demonstrating the corpuscular-wave dualism of light and matter, which is the supreme mystery of the whole quantum physics. A particular riddle here is especially the mechanism responsible for the formation of a interference pattern in a situation when single quantum objects pass through the experimental setup. In the article the main idea of the experiment is discussed and two possible explanations of its results are briefly shortly presented: the view of the Copenhagen school and the de Broglie-Bohm’s pilot wave theory.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2013, 52; 35-52
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Does time exist in quantum gravity?
Autorzy:
Kiefer, Claus
Powiązania:
https://bibliotekanauki.pl/articles/690788.pdf
Data publikacji:
2015
Wydawca:
Copernicus Center Press
Tematy:
cosmology
arrow of time
entropy
quantum gravity
Opis:
Time is absolute in standard quantum theory and dynamical in general relativity. The combination of both theories into a theory of quantum gravity leads therefore to a “problem of time”. In my essay, I investigate those consequences for the concept of time that may be drawn without a detailed knowledge of quantum gravity. The only assumptions are the experimentally supported universality of the linear structure of quantum theory and the recovery of general relativity in the classical limit. Among the consequences are the fundamental timelessness of quantum gravity, the approximate nature of a semiclassical time, and the correlation of entropy with the size of the Universe.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2015, 59; 7-24
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kwantowe stworzenie Wszechświata
Quantum creation of the Universe
Autorzy:
Heller, Michał
Powiązania:
https://bibliotekanauki.pl/articles/690622.pdf
Data publikacji:
2007
Wydawca:
Copernicus Center Press
Tematy:
Hartle-Hawking model
inflation
quantum creation
Opis:
The paper discusses the idea of quantum creation of the universe. After a few remarks concerning inflationary models and Tryon's idea of the world's origin as a fluctuation in the preexisting vacuum, the Hartle-Hawking quantum creation model is presented. Its structure and assumptions are discussed, and interpretative difficulties related to the mechanism of 'quantum creation' pointed out. The paper discusses the idea of quantum creation of the universe. After a few remarks concerning inflationary models and Tryon's idea of the world's origin as a fluctuation in the preexisting vacuum, the Hartle-Hawking quantum creation model is presented. Its structure and assumptions are discussed, and interpretative difficulties related to the mechanism of 'quantum creation' pointed out.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2007, 41; 3-15
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum contextuality as a topological property, and the ontology of potentiality
Autorzy:
Woszczek, Marek
Powiązania:
https://bibliotekanauki.pl/articles/1047587.pdf
Data publikacji:
2020-12-29
Wydawca:
Copernicus Center Press
Tematy:
quantum contextuality
the Bell–Kochen–Specker Theorem
quantum ontology
potentiality
ontic indefiniteness
sheaf theory
Opis:
Quantum contextuality and its ontological meaning are very controversial issues, and they relate to other problems concerning the foundations of quantum theory. I address this controversy and stress the fact that contextuality is a universal topological property of quantum processes, which conflicts with the basic metaphysical assumption of the definiteness of being. I discuss the consequences of this fact and argue that generic quantum potentiality as a real physical indefiniteness has nothing in common with the classical notions of possibility and counterfactuality, and that also it reverses, in a way, the classical mirror-like relation between actuality and definite possibility.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2020, 69; 145-189
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Is Schrödingers cat dead or alive?
Autorzy:
Grygiel, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/942951.pdf
Data publikacji:
2005
Wydawca:
Copernicus Center Press
Tematy:
decoherence
measurement problem
quantum logic
quantum mechanics
Schrödinger's cat
Opis:
The Schrödinger's Cat paradox was proposed in 1935 by Edwin Schrodinger, one of the founders of quantum mechanics, as an attempt to visualize the macroscopic realization of a quantum superposition state. A cat is placed in a sealed box together with a vial of poison. A two-state particle (e.g. an electron) is sent into a detector in the box resulting either in a broken or an intact vial and a dead or live cat, respectively. The main problem consists in whether the superposition state of a microscopic particle can be transferred upon the macroscopic cat, that is, whether the cat can exist in a superposition state, being simultaneously dead and alive. Since the standard Copenhagen interpretation is unable to assign any reality to the quantum superposition state, the paradox finds no resolution within the regime of this interpretation. Von Neumann's insistence on the uniform treatment of both microscopic (quantum) and macroscopic (classical) objects according to the laws of quantum mechanics provides a more consistent framework for the resolution of the paradox. In particular, the discovery of the phenomenon of decoherence, whereby the disappearance of the quantum interferences at the macro level is accounted for, suggests the onset of an extremely efficient interference relaxation process (10-23 s) upon the interaction of the two state particle with the detector. As a result, Schrodinger's cat can exist macroscopically either as dead or alive and never as a combination of both. Decoherence not only aids the resolution of the Schrodinger's Cat paradox but also sheds light upon the mechanisms by which the macro-world emerges from the microscopic quantum realm.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2005, 37; 119-139
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum geometry, logic and probability
Autorzy:
Majid, Shahn
Powiązania:
https://bibliotekanauki.pl/articles/1047619.pdf
Data publikacji:
2020-12-29
Wydawca:
Copernicus Center Press
Tematy:
logic
noncommutative geometry
digital geometry
quantum gravity
duality
power set
Heyting algebra
Opis:
Quantum geometry on a discrete set means a directed graph with a weight associated to each arrow defining the quantum metric. However, these ‘lattice spacing’ weights do not have to be independent of the direction of the arrow. We use this greater freedom to give a quantum geometric interpretation of discrete Markov processes with transition probabilities as arrow weights, namely taking the diffusion form ∂+f = (−Δθ + q − p)f for the graph Laplacian Δθ, potential functions q, p built from the probabilities, and finite difference ∂+ in the time direction. Motivated by this new point of view, we introduce a ‘discrete Schrödinger process’ as ∂+ψ = ı(−Δ + V )ψ for the Laplacian associated to a bimodule connection such that the discrete evolution is unitary. We solve this explicitly for the 2-state graph, finding a 1-parameter family of such connections and an induced ‘generalised Markov process’ for f = |ψ|2 in which there is an additional source current built from ψ. We also mention our recent work on the quantum geometry of logic in ‘digital’ form over the field F2 = {0, 1}, including de Morgan duality and its possible generalisations.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2020, 69; 191-236
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Davida Bohma teoria zmiennych ukrytych
David Bohms theory of hidden variables
Autorzy:
Pabjan, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/690698.pdf
Data publikacji:
2009
Wydawca:
Copernicus Center Press
Tematy:
David Bohm
hidden variable theory
nonlocality
quantum mechanics
quantum mechanics' interpretations
Opis:
One of the most important interpretative problems of quantum mechanics concerns the so called hidden variables. Sometimes it is said that the Bell's theorem falsifies theories of such variables, but in fact, it falsifies only local ones. This paper deals with David Bohm's interpretation of quantum mechanics, which is a kind of nonlocal hidden variable theory. This theory delivers a full deterministic and realistic description of quantum phenomena and predicts the same results as standard quantum mechanics. It is argued that this interpretation is still worth being investigated, because it remains in the full agreement with the mathematical formalism of this theory and it surpasses the standard interpretation as far as simplicity and lack of arbitrary assumptions are concerned.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2009, 44; 25-39
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Druga rewolucja kwantowa: dziedzictwo Johna S. Bella
Second Quantum Revolution: The Legacy of John S. Bell
Autorzy:
Pabjan, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/691016.pdf
Data publikacji:
2011
Wydawca:
Copernicus Center Press
Tematy:
John S. Bell
quantum mechanics
EPR
philosophy of science
Opis:
The history of quantum mechanics is divided into two periods which are labeled as the first and the second quantum revolutions. During the first of these periods mathematical formalism of quantum theory was formulated and interpreted, during the second – new quantum technologies were developed. It turns out that conceptual revolution of the first period enabled technological revolution of the second. In this article it is argued, that Irish physicist, John S. Bell, played an important role in the process of triggering the second quantum revolution. His work on quantum entanglement of the EPR particles made possible elaborating some new methods and theoretical approaches clarifying the quantum description of single objects. These methods and approaches became the core of new scientific domains which are hybrids of quantum mechanics and some classical sciences. The quantum cryptography and the quantum computation are examples of such domains and in the paper special attention is paid to them. It is showed that theoretical analyses of John S. Bell provide a conceptual background for these disciplines and this is why it’s not improper to call this physicist – as Alain Aspect did – a prophet of the second quantum revolution.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2011, 49; 123-137
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Points. Lack thereof
Autorzy:
Lizzi, Fedele
Powiązania:
https://bibliotekanauki.pl/articles/690846.pdf
Data publikacji:
2019
Wydawca:
Copernicus Center Press
Tematy:
Quantum geometry
localizability
Planck Scale
Opis:
I will discuss some aspects of the concept of “point” in quantum gravity, using mainly the tool of noncommutative geometry. I will argue that at Planck’s distances the very concept of point may lose its meaning. I will then show how, using the spectral action and a high momenta expansion, the connections between points, as probed by boson propagators, vanish. This discussion follows closely (Kurkov, Lizzi and Vassilevich, 2014).
Źródło:
Zagadnienia Filozoficzne w Nauce; 2019, 66; 35-60
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rogera Penrosea obiektywizacja obserwatora w mechanice kwantowej
The objective status of an observer in quantum mechanics according to Roger Penrose
Autorzy:
Grygiel, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/691132.pdf
Data publikacji:
2009
Wydawca:
Copernicus Center Press
Tematy:
observer
Roger Penrose
quantum mechanics' interpretations
philosophy of physics
Opis:
Unlike in the classical regime, the measurement performed on a quantum system perturbs the state of the system and its properties remain unknown between measurements. Several early interpretations of quantum mechanics suggested that the reduction of the wave vector that occurs in a measurement is effected by a conscious act of an observer. For example, London and Bauer fostered the conviction that it is the act of observation that decides on the fate of the Schrodinger cat. Later developments of quantum mechanical formalism, e.g., decoherence, indicated that there was no need to causally link the mental states of an observer with the purely physical process of a quantum measurement. In particular, the novel quantum models of human brain put forward by Roger Penrose suggest that it is the reduction of the wave vector that causes conscious act of the observer. Although this reversal does not clarify the specifics of the quantum measurement process directly, it illustrates the principle of methodological naturalism whereby externally introduced heuristic postulates are replaced by well justified scientific explanations.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2009, 45; 45-61
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Information and brain
Autorzy:
Kycia, Radosław
Powiązania:
https://bibliotekanauki.pl/articles/1943060.pdf
Data publikacji:
2021-11-07
Wydawca:
Copernicus Center Press
Tematy:
classical information
quantum information
brain models
mind uploading
Opis:
We present the consequences of the assumption of the classical and quantum nature of information storing and processing in the brain. These assumptions result in different behaviours of consciousness under a hypothetical brain copy experiment. The subject is important in the context of ‘mind uploading’ considerations.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2021, 70; 45-72
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eter, stara teoria kwantów, filozofia przyrody i problematyka ciągłości w ujęciu Bogdana Szyszkowskiego
Ether, the old quantum theory, philosophy of nature and the problem of continuity as defined by Bogdan Szyszkowski
Autorzy:
Mścisławski, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/690752.pdf
Data publikacji:
2020
Wydawca:
Copernicus Center Press
Tematy:
Bogdan Szyszkowski
Kiev
natural philosophy
philosophy of physics
aether
continuity
old quatnum theory
quantum mechanics
special theory of relativity
causality
Szyszkowski Bohdan
old quantum theory
Opis:
The aim of this paper is to present the views of one of prominent Polish chemists, namely Bohdan Szyszkowski. Presented views are concerning the relation of the concepts of aether, continuity and causality in the context of revolution in physics that took place at the turn of 19th and 20th centuries. The issues particularly concern his thoughts related to the old quantum theory and special relativity. In particular, this article presents the role of these concepts in the foundations of physics and – in a more general aspect – in the recognized fields of knowledge. The nature of Szyszkowski’s analysis allows him to be considered a very interesting thinker in the area that today is called the philosophy of physics or, perhaps more accurately, the philosophy in science. An important observation made by Szyszkowski is emphasized that mathematical structures cannot have physical properties. Attention was also paid to the Polish intellectual community, which was formed in Kiev before 1919.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2020, 68; 185-216
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 31

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