Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"Rabi oscillations"”.
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Nonadiabatic control of a superconducting qubit via strong driving
… a two-state system is to drive it weakly using Rabi dynamics. This approach is ineffective for a large scale quantum computer because the rotation is slow, and decoherence breaks the fragile state before the computation can be completed. To address this problem, we developed a method to rapidly …
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Characterization of Josephson Devices for Use in Quantum Computation
… device, including coherent dynamics such as Rabi oscillations. I did this by comparing results to the expected behavior of ideal two-level systems and with more detailed master equation and density matrix simulations. I performed state manipulation by applying dc bias currents and resonant …
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Optical excitations in cold gases
… condensation. We demonstrate a relation between Rabi oscillations and internal Josephson oscillations, and find that an analogue of the internal Josephson effect exists in a non-condensed system.
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Coherent manipulations of trapped 88Sr+ using the 4D5/2 --> 5S1/2 transition
… with a high degree of precision: 17 consecutive Rabi oscillations can be driven with a contrast exceeding 80 percent, and Ramsey inteferometry indicates that phase coherence decays with a time constant of 342±6/[mu]s. Because the laser's dominant spectral broadening occurs on a slow timescale, …
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Coherent two photon excitation within an extended cloud of Rubidium 85 for the purposes of atomic interferometry and cooling
… using the techniques of Raman spectroscopy, Rabi oscillations, Ramsey interferometry and spin echo. We have found the minimum time constant for the decay in the decoherence to be 2.1fi0:2 ms, which is a result of non-radiative and partially non-stochastic dephasing mechanisms. Due to a high …
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Novel schemes for the optical manipulation of atoms and molecules
… are discussed. Although we have not yet seen Rabi oscillations, we are confident that we can now have sufficient control to begin to implement simple interferometric sequences. However, there remain significant challenges if we are to coherently manipulate the momentum, and the prospects for …
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Photoionization of atoms with ultrashort XUV laser pulses at extreme intensities
… of this survey and the resulting signatures as Rabi oscillations and characteristic spectra of photoelectrons are analysed. Furthermore, different levels of theory are applied for one-dimensional model atoms, providing a systematically manner to pinpoint the features induced by coherent and …
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Coherent control of Rydberg atoms using sub-kHz linewidth excitation lasers
… from the √2 collective-enhancement of the Rabi oscillations with respect to the single atom case. Our ability to perform double-atom experiment offers the opportunity to implement a proof of a principle of a cNOT mesoscopic gate based on EIT, using the Rydberg state 81D5/2 for high-fidelity …
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Surface Friction and Spectroscopic Probes of New Physics with Trapped Ions
… Attempts at seeing quantum tunneling via static Rabi oscillations are described. While no smoking-gun signature of tunneling was repeatable, the suppression of quantum tunneling behavior is attributed to certain technical limitations of the experiment apparatus, and possible remedies are …
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Non-equilibrium dynamics of dipole-coupled internal states in cold gases
… of the system, we find the dynamics are given by Rabi oscillations, with a bifurcation in the dynamics as a function of drive strength between small scale and large scale oscillations. Analysing the stability of these oscillations to small fluctuations reveals that interactions tend to cause the …
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Slow and fast light by spectral hole-burning in the solid state
… fails because of coherent transients such as Rabi oscillations, free-induction decay and self-induced transparency (SIT). Switching between slow and fast light was obtained by transient hole-burning, which was reported for the first time. These results could pave the way to applications such …
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On the Dynamics of Single-Electron Tunneling in Semiconductor Quantum Dots under Microwave Radiation
… superimposed by microwave photons, inducing the Rabi oscillations and a net direct tunnel current which is experimentally measurable. A qubit is formed in a double quantum dot. Two new microwave spectroscopy techniques are developed in this thesis to explore the dynamics of PAT (SET) in quantum …
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Quantum dot-based Entangled-Light Emitting Diodes (E-LED) for quantum relays
… excitation of the QD was explored. Analysis of Rabi oscillations in a quantum dot with a bound exciton state demonstrated coupling of the ground state and the biexciton state by the external oscillating field of a laser, therefore allowing the transition between the two states. The results …
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Photon Sources for Linear Optical Quantum Computing
… excitation is demonstrated by performing Rabi oscillations and Ramsey interference in the excitonic population. We also investigate Ramsey interference in a Faraday geometry magnetic field and observe a variety of beats and oscillations in the interferograms. We develop a model to explain …
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Energy and information transfer via coherent exciton wave packets
… uncovered a computational issue associated with Rabi oscillations that had been incorrectly characterized in the literature. My research elucidated the actual problem and a solution was found. This new methodology was an integral part of the overall computational analysis. The thesis then takes …
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Developing the spin qubit of the tin-vacancy center in diamond for quantum networks
Quantum technologies working towards quantum computation and quantum communication have made tremendous progress over the past few years, highlighted by the 2019 "quantum supremacy" achievement demonstrating that quantum computers can realize calculations intractable to classical computers [5]. …