Events at Physics |
Events on Wednesday, December 4th, 2024
- Preliminary Exam
- Protocol for robust quantum networks
- Time: 2:00 pm - 4:00 pm
- Place: 5280 Chamberlin Hall or
- Speaker: Omar Khaled Nagib Abdelhakim Mohamed, Physics PhD Graduate Student
- Abstract: Quantum networks consist of quantum nodes (e.g., atomic qubits) connected by remote entanglement. For scalable quantum networks, it is essential to engineer interactions between remote atomic qubits. This is typically achieved through two-qubit gates between atomic qubits in cavities and flying photons. Previous schemes have been sensitive to experimental imperfections, with fidelities limited to the range of 75–80%. I propose an atom-photon CZ gate that utilizes doubly degenerate ground and excited state energy levels to mediate the atom-light interaction. The setup consists of a cavity and a Mach-Zehnder interferometer. The gate operates by converting error-inducing photons into losses, making the scheme less sensitive to errors compared to previous schemes.
I will also discuss my research progress on two additional projects. The first project proposes the use of Grover's algorithm in a cavity to efficiently prepare entangled states of many qubits. The second project is a mathematical and numerical method that enables fast simulation of open quantum systems through the use of generalized inverses. - Host: Mark Saffman
- Theory Seminar (High Energy/Cosmology)
- Quantum gravity as a lattice model
- Time: 4:00 pm - 5:30 pm
- Place: Chamberlin 5280
- Speaker: Monica Jinwoo Kang, UPenn, Philadelphia
- Abstract: As it is essential to have a quantum theory of gravity for understanding the fundamental principles underlying black hole thermodynamics, constructing and studying quantum gravity has been a constant desire in modern theoretical physics. I will construct the explicit framework to build a formalism to construct a lattice model of space time and quantum gravity. I will present explicit toy models of quantum gravity with this framework. I will utilize quantum gravity in the semi-classical regime by taking quantum field theory as its framework and demonstrate that the notion of entanglement, which is central in the quantum nature of physics, plays an important role in studying quantum gravity.
- Host: Gary Shiu