Thesis
Quantum-enhanced two photon interactions
- Creator
- Rights statement
- Awarding institution
- University of Strathclyde
- Date of award
- 2025
- Thesis identifier
- T17387
- Person Identifier (Local)
- 202089674
- Qualification Level
- Qualification Name
- Department, School or Faculty
- Abstract
- Parametric down conversion (PDC) is a nonlinear optical process that is extensively used to produce photon pairs; when it does this, it is conventionally called the low gain of PDC. The same state is also used to produce squeezed sources, light which can have uncertainties below the standard quantum limit, but at the cost of increased uncertainties in other properties. Two photon interactions are the term I will use to refer to a class of processes in which two photons must be present at a given position in a short time frame. Principle and particularly, I investigate sum frequency generation (SFG), a nonlinear process in which two pump photons are destroyed, and a final photon is produced at the sum of the pump photons’ energies. In this work, I look to observe sum frequency generation pumped with the down converted state as we transition from the low gain into the high gain of parametric down conversion. In doing so, I develop both theoretical models and experimental procedures to understand and quantify entangled two photon interactions. Specifically, I study the effects of gain on the down converted state and present an intuitive explanation with a new interpretation of previous theoretical work to help quantify the effects. I examine the effect of losses in the down converted state on entangled sum frequency generation (eSFG) and originate a model explaining these results. I finish by conducting a comparative study between eSFG and classical SFG as we transition from the low gain to the high gain of PDC. We show that there can be an enhancement to sum frequency generation by pumping with the down converted light above the low gain of parametric down conversion.
- Advisor / supervisor
- Caspani, Lucia
- Resource Type
- DOI
Relations
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PDF of thesis T17387 | 2025-06-12 | Public | Download |