Generation of pairs of entangled qubits from optical fiber resonators in Toulouse (31) - LAAS

Generation of pairs of entangled qubits from optical fiber resonators

Description: LAAS has been involved for several years in the production of fiber optic resonators with a high quality factor for applications in the generation of optical or microwave signals with high spectral purity. These resonators are currently optimized for the generation of optical frequency combs or, more simply, for obtaining high quality factors for passive operation such as laser stabilization. 

The goal of the thesis is to optimize these resonators for a completely different application: the generation of photon pairs or of quantum frequency combs. This optimization may relate to the free spectral range, the type of optical guide and the optical pumping conditions. The experimental approach will use a pulsed laser and filtering systems, then photon counting with SPADs. The pump rejection will need to be correctly sized for a zero pump detection probability. Finally, we will check the pump threshold for the generation of photon pairs, which we will compared to the theory. The assessment of quantum comb generation with this approach will also be investigated. To this purpose, a multi-channel photon detector will be assembled with SPAD devices, RF amplifiers and signal processing and counting unit. The work will then continue by setting up a quantum fiber optical link using time bin qubits. We will study the entanglement of qubits using a two-input detector. Subsequently, a compact version of the system could be designed in conjunction with an industrial partner.
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Work location:
CNRS - LAAS
7 Avenue du Colonel Roche
31400 Toulouse, France

Contact: Olivier Llopis (llopis@laas.fr)

To apply: Job CNES - 24-021 Generation of pairs of entangled qubits from optical fiber resonators Ph.D., 36 months or Résonateurs optiques fibrés pour la génération de paires de photons intriqués - LAAS-CNRS