Engineering tunable local loss in a synthetic lattice of momentum states

Samantha Lapp, Jackson Ang'Ong'A, Fangzhao Alex An, Bryce Gadway

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Dissipation can serve as a powerful resource for controlling the behavior of open quantum systems. Recently there has been a surge of interest in the influence of dissipative coupling on large quantum systems and, more specifically, how these processes can influence band topology and phenomena like many-body localization. Here, we explore the engineering of local, tunable dissipation in so-called synthetic lattices, arrays of quantum states that are parametrically coupled in a fashion analogous to quantum tunneling. Considering the specific case of momentum-state lattices, we investigate two distinct mechanisms for engineering controlled loss: one relying on an explicit form of dissipation by spontaneous emission, and another relying on reversible coupling to a large reservoir of unoccupied states. We experimentally implement the latter and demonstrate the ability to tune the local loss coefficient over a large range. The introduction of controlled loss to the synthetic lattice toolbox promises to pave the way for studying the interplay of dissipation with topology, disorder, and interactions.

Original languageEnglish (US)
Article number045006
JournalNew Journal of Physics
Issue number4
StatePublished - Apr 29 2019

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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