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

• URL: http://arxiv.org/abs/2105.03200v1
• Date: Fri, 7 May 2021 12:20:27 GMT
• Title: Polaron formation in a spin chain by measurement-induced imaginary Zeeman field
• Authors: P. V. Pyshkin, E. Ya. Sherman and Lian-Ao Wu
• Abstract summary: 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.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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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