Southwest Quantum Information and Technology

Enhanced quantum-classical dynamics difference via control of weak measurement

Presenting Author: Yueheng Shi, Carleton College
Contributing Author(s): Sacha Greenfield, Jessica Eastman, Andre Carvalho, Arjendu K. Pattanayak

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. Thus, measurement can induce quantum behavior in a system significantly more easily than changing system size, and particularly visible in the energy dynamics which map to system trajectories as well. We are discuss applications our control mechanisms for quantum thermal engines and work extraction via measurement.

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