Hanhee Paik, Yale
Abstract
Superconducting qubits based on Josephson junctions have made a rapid progress in demonstrating quantum coherence and became one of the most promising technologies to realize a large-scale quantum information
processor. I introduce a 3D transmon, a new implementation of a superconducting qubit which demonstrates an order of magnitude improved coherence than existing conventional superconducting quantum circuits.
The 3D transmon employs a single Josephson junction and a superconducting waveguide cavity in a circuit QED architecture where the Josephson junction is coupled to the cavity via a dipole antenna. I will discuss the new physics of Josephson junctions and superconducting circuits we were able to observe due to the improved coherence in the 3D transmon and how to coherently control coupled 3D transmon qubits using a microwave-driven cavity phase gate.