Joint Quantum Seminar
Wednesday, March 6, 2019
2:00 PM, Jefferson 250
*Please note time change. There will be no 10-minute talk*
Prof. Irfan Siddiqi, University of California, Berkeley
“Weak Quantum Measurements: From Art to Architecture”
Canonical microwave frequency cavity quantum electrodynamical systems can be constructed
from superconducting circuits, which thus enable a powerful laboratory for exploring
foundational questions in quantum mechanics. When combined with near-quantum-limited
photon detection, it is possible to enter the weak measurement regime where the continuous
voltage output from the cavity can be used to construct individual quantum trajectories
which statistically represent the most likely dynamical evolution of the artificial atom
contained therein. Such techniques can be combined with fast feedback to change the
measurement observable within the coherence time of the system, allowing one to probe
quantities typically inaccessible to classical devices. As an example, I will discuss
canonical measurements of the phase of a quantum signal which exceed the sensitivity
afforded by heterodyne detection, and whose associated trajectories allow us to verify the
acquisition of nearly-purely phase data.
Guest Presentation will begin at 2:00 PM (no 10-minute talk)
Refreshments will be provided
Thank you,
Samantha Dakoulas
Faculty Assistant to Professors Lukin & Greiner & their groups
Department of Physics
17 Oxford St., Lyman 324A
Cambridge, MA 02138
P. (617) 496-2544
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