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Stirring by Staring: Measurement-Induced Chirality

Wampler, Matthew and Khor, Brian J. J. and Refael, Gil and Klich, Israel (2022) Stirring by Staring: Measurement-Induced Chirality. Physical Review X, 12 (3). Art. No. 031031. ISSN 2160-3308. doi:10.1103/physrevx.12.031031.

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In quantum mechanics, the observer necessarily plays an active role in the dynamics of the system, making it difficult to probe a system without disturbing it. Here, we leverage this apparent difficulty as a tool for driving an initially trivial system into a chiral phase. In particular, we show that by utilizing a pattern of repeated occupation measurements we can produce chiral edge transport of fermions hopping on a Lieb lattice. The procedure is similar in spirit to the use of periodic driving to induce chiral edge transport in Floquet topological insulators, while also exhibiting novel phenomena due to the nonunitary nature of the quantum measurements. We study in detail the dependence of the procedure on measurement frequency, showing that in the Zeno limit the system can be described by a classical stochastic dynamics, yielding protected transport. As the frequency of measurements is reduced, the charge flow is reduced and vanishes when no measurements are done.

Item Type:Article
Related URLs:
URLURL TypeDescription
Wampler, Matthew0000-0001-6303-3561
Klich, Israel0000-0002-8979-0170
Additional Information:I. K. would like to thank Kun-Woo Kim for discussions. The work of I. K., B. J. J. K., and M. W. was supported in part by the NSF Grant No. DMR-1918207. G. R. acknowledges support from the Institute of Quantum Information and Matter, an NSF Physics Frontiers Center funded by the Gordon and Betty Moore Foundation, and the Simons Foundation, as well as to the NSF DMR Grant No. 1839271. This work was performed in part at Aspen Center for Physics, which is supported by National Science Foundation Grant No. PHY-1607611.
Group:Institute for Quantum Information and Matter
Funding AgencyGrant Number
Institute of Quantum Information and Matter (IQIM)UNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Simons FoundationUNSPECIFIED
Issue or Number:3
Record Number:CaltechAUTHORS:20220920-630646700
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:117100
Deposited By: Melissa Ray
Deposited On:24 Sep 2022 01:37
Last Modified:24 Sep 2022 01:37

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