NJIT Physics Department Seminar

11/05/07, Monday


Amorphous Insulator: Unnecessary Evil in Superconducting Quantum Bits


Prof. Seongshik (Sean) Oh

Rutgers University - New Brunswick

(Condensed Matter Physics, Host: Ahn)


Time: Noon-1 pm with 11:30 am tea time

Room: 373 Tiernan



Quantum computers based on the superconducting quantum bits (qubits) are considered promising due to their scalable architecture. However, decoherence is a major obstacle, and identifying and eliminating the decoherence sources is one of the most important tasks for superconducting quantum computation. Over the past few years, we have found that the amorphous insulators commonly used within and around the superconducting qubits are one of the most serious decoherence sources. I will discuss the physical origin of this decoherence mechanism and show how we can significantly improve the coherence properties of the qubits by eliminating these problematic amorphous insulators.