Beyond von-Neumann projection – implementing unconventional measurements

TYPECondensed Matter Seminar
Speaker:Shay Hacohen-Gourgy
Affiliation:UC Berkeley
Location:Lidow Nathan Rosen (300)

Pushing the limits of quantum measurements lies at the heart of quantum metrology, quantum sensors and studies of quantum foundations. Measurements in superconducting circuit systems have advanced in the last years to the level that we can track an observable in real-time, reconstruct the quantum trajectory, and even feed-back during a single experimental iteration. However, the measurement observable is static and set by the architecture. I will present a novel detection scheme that allows independent dynamic control over the measurement operators of multiple readout channels. Using this new scheme, I will demonstrate how a wavefunction evolves when two non-commuting observables of a qubit are probed simultaneously. I will further present the ramifications of this scheme in the context of quantum control and metrology applications.