Southwest Quantum Information and Technology

Using measurement back action to change nonlinear open system dynamics

Presenting Author: Arjendu Pattanayak, Carleton College
Contributing Author(s): April Anderson, Sacha Greenfield, Yueheng Shi

Back-action induced by weak measurement can dramatically affect the quantum state dynamics of a nonlinear quantum system. We devise a measurement control protocol using the local oscillator phase $\phi$ for a homodyne measurement of a signal from the system. We use the the percentage of non-classical energy in the system $Q$ as a measure of quantumness, and find that adaptive control of $\phi$ increases $Q$ by several orders of magnitude. We explore using sinusoidally oscillating homodyne phases to drive the system, and discuss thermal engines and work extraction via measurement.

(Session 5 : Saturday from 5:00pm - 7:00pm)