Graduate Thesis Or Dissertation
Two-Species Ion Arrays for Quantum Logic Spectroscopy and Entanglement Generation 公开 Deposited
https://scholar.colorado.edu/concern/graduate_thesis_or_dissertations/mk61rh195
- Abstract
- The quantum states of trapped atomic ions can be highly isolated from external perturbation, and precisely manipulated with applied laser fields. This makes them an excellent medium for quantum-limited experiments such as quantum information processing and precision spectroscopy. A relatively small number of ion species have been used for these types of experiments because most species are difficult to laser cool and detect directly. This thesis demonstrates a way to overcome this limitation by use of sympathetic cooling and state detection based on quantum logic. We apply these techniques to mixed-species arrays of Al+ and Be+ ions. A mathematical model for the motion of such a two-species array is presented in order to explore some features of the ion dynamics that are relevant for the experiments. Repetitive quantum nondemolition measurements of the electronic states of a Al+ ion show detection fidelities as high as 99.94 %. We also demonstrate the simultaneous detection of two Al+ ions and observe a detection fidelity of 99.8 %. The basic ideas behind the detection strategy are extended to potentially enable similar experiments on a more general class of atomic and molecular ions. We have also investigated, theoretically and experimentally, a method for preparing entangled Dicke states in trapped atomic ions. We consider a linear chain of N ion qubits that is prepared in a particular Fock state of motion. The m phonons are removed by applying a laser pulse globally to the N qubits, and converting the motional excitation to m flipped spins. The global nature of this pulse ensures that the m flipped spins are shared by all the target ions in a state that is a close approximation to the Dicke state. We calculate numerically the fidelity limits of the protocol and find small deviations from the ideal state for m = 1 and m = 2. We have demonstrated the basic features of this protocol by preparing the Bell state in two Mg+ target ions trapped simultaneously with an Al+ ancillary ion.
- Creator
- Date Issued
- 2010
- Academic Affiliation
- Advisor
- Committee Member
- Degree Grantor
- Commencement Year
- Subject
- 最新修改
- 2019-11-17
- Resource Type
- 权利声明
- Language
关联
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缩略图 | 标题 | 上传日期 | 公开度 | 行动 |
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twoSpeciesIonArraysForQuantumLogicSpectroscopyAndEntangl.pdf | 2019-11-17 | 公开 | 下载 |