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| Author(s): |
Luiz Couto Corrêa Pinto Filho
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: | 2020-11-19 |
| Examining board members: |
Marcelo Martinelli;
Jose Augusto Oliveira Huguenin;
José Wellington Rocha Tabosa
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| Advisor: | Marcelo Martinelli; Breno Marques Gonçalves Teixeira |
| Abstract | |
We developed a system capable of generating bipartite entanglement, and with promising results towards the generation of tripartite entangled states of light, using an Optical Parametric Oscillator. The generated fields are resonant with the Rubidium D2 transition line at 780 nm for the reflected pump, and with the C-band of telecommunications channels at 1560 nm for signal and idler. We verified that phonon noise in the crystal was responsible for introducing phase noise and that lowering the temperature of the system would reduce the noise, improving the prospects of obtaining tripartite entanglement. In a separate experiment, we built an optical pumping system in which, along with a magnetic shield and magnetic fields generated by coils, we were able to prepare and characterize an atomic polarization state with an orientation p=0.9 and a polarization noise of 2.6 dB above the shot noise limit at a central frequency of 23.5 kHz and a linewidth of 70 Hz. These two systems were built as the first steps towards the implementation of a teleportation protocol between atoms and light resonant at different wavelengths, setting the foundations for the implementation a quantum network. (AU) | |
| FAPESP's process: | 17/27096-9 - Using teleportation to convert quantum states of the field into the telecom C-band |
| Grantee: | Luiz Couto Corrêa Pinto Filho |
| Support Opportunities: | Scholarships in Brazil - Master |