Quantum acoustics with lithium niobate nanostructures
Abstract/Contents
- Abstract
- Phononic crystals are today the most sophisticated technology for manipulating acoustic waves on the surface of a chip. As such, ordinarily these devices can be described by the classical physics of elasticity; accessing a regime where their behavior is manifestly quantum mechanical has so far remained elusive. One way of reaching this regime would be to use a superconducting qubit to monitor and control the acoustics. Such `quantum acoustic' devices would have wide-ranging applications to quantum transduction, sensing, and information processing. In this thesis I present a collection of works that lay the groundwork for realizing this vision. First I introduce a technique for calculating coupling strengths between superconducting circuits (which include, but are not restricted to, transmon qubits) and arbitrary piezoelectric nanostructures. I then present the first demonstration of direct, resonant coupling between a superconducting circuit and a phononic-crystal-defect resonator (PCDR). This required developing a fabrication process that combines superconducting microwave circuits and suspended lithium niobate nanostructures in a fully integrated, on-chip platform. I then present results from a later generation of devices, including the demonstration of a transmon qubit and an array of PCDRs in the strong coupling regime. Finally, using these same devices I show we can generate a strong dispersive interaction that results in phonon-number-dependent splitting of the qubit spectroscopic line. This constitutes the first observation of the quantized energy levels of a nanomechanical oscillator, taking us back to the original scientific motivation of directly observing the quantum mechanical nature of a (confined) acoustic wave. Needless to say, such dispersive physics also has applications in quantum sensing and information processing. I conclude with a discussion on future experiments along that direction, including quantum nondemolition measurements of single phonons and generation of coherent state superpositions (a.k.a. cat states) of mechanical motion.
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 | 2019; ©2019 |
| Publication date | 2019; 2019 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Arrangoiz Arriola, Patricio |
|---|---|
| Degree supervisor | Safavi-Naeini, Amir H |
| Thesis advisor | Safavi-Naeini, Amir H |
| Thesis advisor | Fejer, Martin M. (Martin Michael) |
| Thesis advisor | Hayden, Patrick, 1965- |
| Degree committee member | Fejer, Martin M. (Martin Michael) |
| Degree committee member | Hayden, Patrick, 1965- |
| Associated with | Stanford University, Department of Applied Physics. |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Patricio Arrangoiz Arriola. |
|---|---|
| Note | Submitted to the Department of Applied Physics. |
| Thesis | Thesis Ph.D. Stanford University 2019. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2019 by Patricio Arrangoiz Arriola
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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