Title: Probing complex dynamics of hybrid quantum systems
Language: English
Authors: Valookaran, Abhilash 
Qualification level: Diploma
Keywords: Quantenphysik
Quantum Physics; Quantum Technologies
Advisor: Schmiedmayer, Hannes-Jörg 
Assisting Advisor: Majer, Johannes 
Issue Date: 2015
Number of Pages: 83
Qualification level: Diploma
Hybrid quantum systems, which combines the advantages of different quantum systems, play an essential role in the realisation of quantum computation, especially as quantum memory. This thesis discusses the very promising hybrid quantum system based on the ensemble of negatively charged nitrogen-vacancy centers (NV-centers) in diamond and superconducting microwave cavities. The decoherence of this system, due to the inhomogeneous spin broadening, seems to be the major obstacle of utilising the NV-centers as a quantum information storage. This works focuses on the study of the dynamics of our NV-center spin ensemble strongly coupled to a superconducting resonator driven by pulse sequences with a carrier frequency equaling the cavity frequency. A precise knowledge of the spin broadening, which has a non-Lorentzian distribution, led to the observation of the so called 'cavity protection effect'. Furthermore this work demonstrates the enhancement of the damped Rabi oscillations between the spin ensemble and the cavity mode through appropriate chosing of the microwave pulses, which could change in the order of two magnitudes. Last we also confirmed the theoretical analysis of the crossover from markovian to non-markovian dynamics for our system, which is achieved for increasing coupling strength.
URI: https://resolver.obvsg.at/urn:nbn:at:at-ubtuw:1-84726
Library ID: AC12693008
Organisation: E141 - Atominstitut 
Publication Type: Thesis
Appears in Collections:Thesis

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