Event
Ph.D. Research Proposal Exam: Abhijit Biswas
Wednesday, July 30, 2025
4:00 p.m.
Souad Nejjar
301 405 8135
snejjar@umd.edu
ANNOUNCEMENT: Ph.D. Research Proposal Exam
Name: Abhijit Biswas
Committee:
Professor Edo Waks (Chair)
Professor Ronald Walsworth
Name: Abhijit Biswas
Committee:
Professor Edo Waks (Chair)
Professor Ronald Walsworth
Professor Saikat Guha
Date/time: Wednesday, July 30, 2025 at 4:00 PM
Title: Single Photon Nonlinearity in Nanobeam for Quantum Networks and Simulation
Abstract: Photons are a crucial component in quantum technologies, serving as carriers of quantum information. To exchange information with a photon, strong nonlinearity at the single-photon level is required. The nonlinearity in an atom can be harnessed for this purpose by coupling it to a photonic cavity. There are several demonstrations of single photon nonlinearity, but they lack efficiency and compactness for chip-integrated operation. This research proposal aims to present an experimental demonstration of single photon nonlinearity in a nanobeam photonic cavity coupled to a quantum dot. The strong coupling between the nanobeam cavity and the quantum dot yielded high cooperativity, and the tapered design of the nanobeam provided efficient coupling to a single-mode fiber. High efficiency and high cooperativity make the nanobeam an ideal candidate for applications in a quantum network. The compactness of the nanobeam design makes it compatible for homogeneous and heterogeneous on-chip integration. We propose experiments to explore chiral quantum optics using this device. With the high coupling efficiency of the nanobeam, we aim to demonstrate a chiral atomic chain using synthetic time dimension, which serves as a platform for quantum simulations.
Date/time: Wednesday, July 30, 2025 at 4:00 PM
Title: Single Photon Nonlinearity in Nanobeam for Quantum Networks and Simulation
Abstract: Photons are a crucial component in quantum technologies, serving as carriers of quantum information. To exchange information with a photon, strong nonlinearity at the single-photon level is required. The nonlinearity in an atom can be harnessed for this purpose by coupling it to a photonic cavity. There are several demonstrations of single photon nonlinearity, but they lack efficiency and compactness for chip-integrated operation. This research proposal aims to present an experimental demonstration of single photon nonlinearity in a nanobeam photonic cavity coupled to a quantum dot. The strong coupling between the nanobeam cavity and the quantum dot yielded high cooperativity, and the tapered design of the nanobeam provided efficient coupling to a single-mode fiber. High efficiency and high cooperativity make the nanobeam an ideal candidate for applications in a quantum network. The compactness of the nanobeam design makes it compatible for homogeneous and heterogeneous on-chip integration. We propose experiments to explore chiral quantum optics using this device. With the high coupling efficiency of the nanobeam, we aim to demonstrate a chiral atomic chain using synthetic time dimension, which serves as a platform for quantum simulations.
