Quantum engineering by Rydberg dressing in a cold atomic gas
Abstract/Contents
- Abstract
- We are witnessing remarkable progress in building large and controllable quantum systems. At the forefront of this development are laser-cooled atoms, which can be used as atomic clocks, sensitive measurement probes or quantum computing platforms. A necessary ingredient of many computation and metrology schemes is the ability to have local and dynamical control of interactions between atoms. In this thesis, I present a platform based on highly excited Rydberg states of cesium atoms. We realize long-range optically controlled Ising interactions in a cloud of cold cesium atoms by coupling the atomic ground state to a Rydberg state. By adding a microwave coupling between the clock states of cesium, we emulate a transverse-field Ising model and detect dynamical signatures of the paramagnetic-ferromagnetic phase transition. I present work on producing spin-squeezed states, in which quantum correlations enable higher measurement precision than possible with an uncorrelated state. I show the first measurement of spin squeezing with the local Ising interactions, demonstrating a factor $\xi^2=\num{0.80(7)}$ reduction in phase variance below the projection noise limit. I present prospects for improving spin squeezing in this system, by minimizing sources of loss, trapping atoms in a regular array and utilizing the transverse field. Finally, I propose an application of optically controlled Ising interactions to the computational problem of number partitioning, where a hardware-efficient encoding in a central spin system enables solutions to be found via Grover's algorithm. The simulated performance of the algorithm exhibits a quantum speedup in a system of Rydberg-dressed atoms, paving the way for demonstrations in near-term experiments.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2021; ©2021 |
| Publication date | 2021; 2021 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Marković, Ognjen |
|---|---|
| Degree supervisor | Schleier-Smith, Monika |
| Thesis advisor | Schleier-Smith, Monika |
| Thesis advisor | Kasevich, Mark A |
| Thesis advisor | Safavi-Naeini, Amir H |
| Degree committee member | Kasevich, Mark A |
| Degree committee member | Safavi-Naeini, Amir H |
| Associated with | Stanford University, Department of Physics |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Ognjen Marković. |
|---|---|
| Note | Submitted to the Department of Physics. |
| Thesis | Thesis Ph.D. Stanford University 2021. |
| Location | https://purl.stanford.edu/tj863pj7694 |
Access conditions
- Copyright
- © 2021 by Ognjen Markovic
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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