bq Seminar

John Mark Kreikebaum (UCB): "Superconducting Quantum Coherent Circuits: Introductory Tutorial, Challenges, and Near Term Applications"

67-3111 (Molecular Founrdy)


Molecular Founrdy

67-3111 Molecular Foundry, LBNL

One avenue towards the realization of a universal quantum computer is utilizing superconducting quantum coherent circuits and more specifically, transmon quantum bits (qubits). Remarkable progress has been made in the last 20 years with respect to the coherence and scalability of these building blocks and our ability to readout their state.  In this talk, I will introduce the theory of circuit quantum electrodynamics (cQED) and present on the status of experimental implementations including challenges both resolved and open. I will then introduce near-term applications for these circuits that are actively researched in our group with an emphasis on: single microwave photon detection, a challenging task due to the 4-5 orders of magnitude smaller energies of photons at this frequency compared to optical photons, which can already be individually resolved with commercially available sensors.