Full text
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| Author(s): |
Gabriel Couto Rickli
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto de Física (IF/SBI) |
| Defense date: | 2025-05-05 |
| Examining board members: |
Marcelo Martinelli;
Gabriel Horacio Aguilar;
Breno Marques Gonçalves Teixeira
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| Advisor: | Marcelo Martinelli |
| Abstract | |
We present a complete characterization of the quantum state of light generated by an optical parametric oscillator on a silicon nitride chip. We observed amplitude noise squeezing of -2.3(3) dB. We also showed that the amplitude noise squeezing is lost as the pump power is increased beyond the oscillation threshold. In the pursuit of measuring entanglement in the system, we found a significant phase noise, two orders of magnitude higher than expected, which prevents the generation of entanglement in this system under the investigated experimental conditions. We explored strategies to mitigate this noise. In one hand, we developed new cavities and chips, which were designed and fabricated during my research internship in Prof. Michal Lipson\'s laboratory at Columbia University. We now have cavities available in the laboratory for exploring various regimes. On another line of investigation, we demonstrated, for the first time in this system, an increase in phase noise with temperature in a controlled measurement. We outline a pathway toward the first on-chip direct generation of entanglement in continuous variables, with potential applications for the generation of quantum states for universal quantum computing. (AU) | |
| FAPESP's process: | 21/04829-6 - On-chip multimode quantum correlations |
| Grantee: | Gabriel Couto Rickli |
| Support Opportunities: | Scholarships in Brazil - Master |