Print Email Facebook Twitter The quantum advantage to charging electron spin qubit batteries Title The quantum advantage to charging electron spin qubit batteries Author Breeman, Emma (TU Delft Electrical Engineering, Mathematics and Computer Science; TU Delft Applied Sciences) Contributor Blaauboer, Miriam (mentor) Visser, Paul (mentor) Degree granting institution Delft University of Technology Date 2018-12-06 Abstract Quantum thermodynamics takes over from classical thermodynamics when systems are of the scale of single particles and quantum fluctuations have a noticeable effect. An interesting topic of research of this relatively new field is the quantum battery, which in this thesis consists of an array of N identical electron spin qubits. In an article by Binder et al. [4], it is proven that in theory, an N-times decrease in charging time of the battery is achieved when global operations on qubits are permitted. This thesis investigates if a similar advantage can be achieved by using a local qubitqubit interaction operator on a one-dimensional chain of exchange-coupled electron spin qubits that are driven by microwave radiation in the presence of decoherence. This system is describedby a density matrix in order to include the presence of external influences. The time-evolution of the state of the system is calculated by solving the Von-Neumann equation both analytically and numerically, which is then used to calculate the extractable work. It is shown that exchange interaction does not have a direct effect on the extractable work, since it creates entanglement between two states of the same energy level and the operator commutes with the Hamiltonian of the system. The effect of the CNOT gate on the state of the system is then investigated. While it does have an effect on the extractable work, it did not achieve a decrease in charging time. These results are only relevant for the specific system used in this thesis. For other methods and systems, exchange interaction could lead to faster charging. Subject Quantum thermodynamicsQuantum batteryElectron spin qubit To reference this document use: http://resolver.tudelft.nl/uuid:9ec2c28f-7a36-43e5-9d16-bb974da28fd1 Part of collection Student theses Document type bachelor thesis Rights © 2018 Emma Breeman Files PDF BEP_report_Emma_Breeman_T ... ies_3_.pdf 1.21 MB Close viewer /islandora/object/uuid:9ec2c28f-7a36-43e5-9d16-bb974da28fd1/datastream/OBJ/view