Browsing by Author "Ahlinder, Nova"

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    On the possibility of property composition: A metaphysical investigation of submergent properties in top-down and bottom-up approaches to quantum mechanics
    (2022-01-25) Ahlinder, Nova; Göteborgs universitet/Institutionen för filosofi, lingvistik och vetenskapsteori; Göteborg University/Department of Philosophy, Linguistics and Theory of Science
    In Schaffer’s Monism: priority of the whole (2010) an argument from quantum entanglement in favour of priority monism is put forward. The argument is based on quantum entanglement being a case of emergence and can loosely be described in terms of failure of property decomposition and success of property composition. The statement of property composition always succeeding has recently been challenged by Calosi (2017). I aim to make a case in favour of property composition by making use of a distinction between top-down and bottom-up approaches to quantum mechanics. My conclusion is that decomposition into components is subjective and partial, while a whole-system perspective is objective and general – wholes therefore contain all information found in parts and should be viewed with ontological priority.
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    Quantifying resources for quantum computation with continuous-variables
    (2025-08-05) Ahlinder, Nova; Besker, Filip; Pettersson, Stefan; University of Gothenburg/Department of physics; Göteborgs universitet/Institutionen för fysik
    For quantum computers that employ continuous variables to have exponential computational advantage over classical computers, as well as good error-correcting components, quantum states with the property of being non-Gaussian need to be implemented. These, however, are often hard to create. One solution is to approximate them with states of lower stellar rank, with the accuracy of approximation calculated via stellar fidelity. In this thesis, stellar fidelities of three different non-Gaussian states have been numerically computed using optimization programs in Python. It was found that: 1. For Fock states, it is more beneficial to use core states rather than single-component Fock states to approximate them. Further, as the n for Fock target states increases, the stellar fidelity of core states with stellar rank n − 1 follows an interesting pattern. 2. For binomial plus states, some of them, despite their stellar rank being high, resemble Gaussian states, which gives stellar fidelity measurements support as a complement to stellar rank. 3. Even cat states are dependent on the parameter α, which should be high for optimal error correction, but the stellar fidelity computations in this thesis show that stellar fidelity is lower when α increases. An interesting phase transition in the stellar profiles of cat states was also found.