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Measurement-induced dynamics and stabilization of spinor-condensate domain walls

TitleMeasurement-induced dynamics and stabilization of spinor-condensate domain walls
Publication TypeJournal Article
Year of Publication2019
AuthorsH. M. Hurst, and I.. B. Spielman
JournalPhys. Rev. A
Date PublishedMAY 22
Type of ArticleArticle

Weakly measuring many-body systems and allowing for feedback in real time can simultaneously create and measure new phenomena in quantum systems. We theoretically study the dynamics of a continuously measured two-component Bose-Einstein condensate (BEC) potentially containing a domain wall and focus on the tradeoff between usable information obtained from measurement and quantum backaction. Each weakly measured system yields a measurement record from which we extract real-time dynamics of the domain wall. We show that quantum backaction due to measurement causes two primary effects: domain-wall diffusion and overall heating. The system dynamics and signal-to-noise ratio depend on the choice of measurement observable. We propose a feedback protocol to dynamically create a stable domain wall in the regime where domain walls are unstable, giving a prototype example of Hamiltonian engineering using measurement and feedback.