Lecturer: Dr. Rajamani Vijayaraghavan Affiliation: Tata Institute of Fundamental Research, Mumbai Abstract: Recent progress in ultra-low noise amplification techniques using superconducting devices has enabled fast and high-fidelity measurements of solid-state quantum devices. In this talk, I will focus on superconducting circuits which are engineered to behave like ‘artificial atoms’ when operated at dilution temperatures (~ 10 mK). These circuits have quantized energy levels which can be manipulated and measured using microwave frequency signals. We treat the two lowest quantum levels of the circuit as a quantum bit or qubit. The measurement signal is amplified using a near-noiseless superconducting parametric amplifier enabling high-fidelity monitoring of the quantum state. This paves the way to develop feedback protocols to prepare and stabilize various kinds of quantum states in these circuits. I will focus on the measurement architecture in superconducting circuits and describe how one can implement a near ideal quantum measurement setup. I will describe how we can control the strength of a quantum measurement in this architecture and discuss the information obtained in weak quantum measurements. Finally, I will discuss different feedback protocols and their applications for quantum information processing. ‏האירוע הזה כולל שיחת וידאו ב-Google Hangouts. הצטרף: https://hangouts.google.com/hangouts/_/mail.huji.ac.il/quantum?hceid=bWF...