# Many-body localization in a quantum simulator with programmable random disorder

@article{Smith2016ManybodyLI, title={Many-body localization in a quantum simulator with programmable random disorder}, author={Jacob Smith and Aaron C. E. Lee and Philip Richerme and Brian Neyenhuis and Paul W Hess and Philipp Hauke and Markus Heyl and David A. Huse and Christopher R. Monroe}, journal={Nature Physics}, year={2016}, volume={12}, pages={907-911} }

Interacting quantum systems are expected to thermalize, but in some situations in the presence of disorder they can exist in localized states instead. This many-body localization is studied experimentally in a small system with programmable disorder. When a system thermalizes it loses all memory of its initial conditions. Even within a closed quantum system, subsystems usually thermalize using the rest of the system as a heat bath. Exceptions to quantum thermalization have been observed, but…

## 512 Citations

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An experiment fully emulating the MBL dynamics with a 10-qubit superconducting quantum processor, which represents a spin-1/2 XY model featuring programmable disorder and long-range spin-spin interactions, and provides essential signatures of MBL, such as the imbalance due to the initial nonequilibrium, the violation of eigenstate thermalization hypothesis, and the long-time logarithmic growth of entanglement entropy.

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The results demonstrate the unexpected generality of MBL, with implications about the fundamental requirements for thermalization and with potential uses in engineering long-lived non-equilibrium quantum matter.

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- Physics
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- Physics
- 2016

In the presence of disorder, an interacting closed quantum system can undergo many-body localization (MBL) and fail to thermalize. However, over long times, even weak couplings to any thermal…

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- PhysicsPhysical Review X
- 2019

Closed generic quantum many-body systems may fail to thermalize under certain conditions even after long times, a phenomenon called many-body localization (MBL). Numerous studies have left no doubt…

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- Physics, MedicineProceedings of the National Academy of Sciences
- 2019

It is demonstrated that nonrandom mechanisms that lead to single-particle localization may also lead to many-body localization, even in the absence of disorder, and a class of generic nonrandom models that fail to thermalize are constituted, which suggest new directions for experimentally exploring and understanding the phenomena of many- body localization.

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- Physics
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The interplay of disorder and interactions can have remarkable effects on the physics of quantum systems. A striking example is provided by the long conjectured—and recently confirmed—phenomenon of…

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- Medicine, PhysicsPhysical Review Letters
- 2021

A quantum device composed of 29 functional superconducting qubits is constructed, faithfully reproducing the relaxation dynamics of a nonintegrable spin model, and its flexible programmability highlights its potential in helping the understanding of nontrivial quantum many-body problems, in direct complement to simulations in classical computers.

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- 2019

This work experimentally establishes many-body localization as a qualitatively distinct phenomenon from localization in noninteracting, disordered systems in a disordered Bose-Hubbard chain.

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