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arXiv · 2105.03200

Polaron formation in a spin chain by measurement-induced imaginary Zeeman field

P. V. Pyshkin·E. Ya. Sherman·Lian-Ao Wu
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Abstract

We present a high-rate projective measurement-based approach for controlling non-unitary evolution of a quantum chain of interacting spins. In this approach, we demonstrate that local measurement of a single external spin coupled to the chain can produce a spin polaron, which remains stable after the end of the measurement. This stability results from the fact that the Hilbert space of the chain contains a subspace of non-decaying states, stable during the nonunitary evolution. These states determine the resulting final state of the chain and long-term shape of the polaron. In addition to formation of the spin polarons, the presented measurement protocol can be used for distillation of non-decaying states from an initial superposition or mixture.

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P. V. Pyshkin, E. Ya. Sherman, Lian-Ao Wu. 2021-05-07. Polaron formation in a spin chain by measurement-induced imaginary Zeeman field. https://doi.org/10.1103/physrevb.104.075136

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