The Stanford Photonics Research Center

Quantum Measurement with Superconducting Circuits - Irfan Siddiqi & Hideo Mabuchi

The Josephson tunnel junction is a unique electronic circuit element which is both non-linear and non-dissipative. This combination make it well suited to measure the state of a quantum mechanical system with high fidelity and minimum back-action. I will describe the operation of a new type of Josephson amplifier, based on a dynamical bifurcation, and demonstrate how it can be used to measure a quantum spin ½ system.