Many-body Hilbert space scarring on a superconducting processor

Pengfei Zhang, Hang Dong, Yu Gao, Liangtian Zhao, Jie Hao, Jean Yves Desaules, Qiujiang Guo, Jiachen Chen, Jinfeng Deng, Bobo Liu, Wenhui Ren, Yunyan Yao, Xu Zhang, Shibo Xu, Ke Wang, Feitong Jin, Xuhao Zhu, Bing Zhang, Hekang Li, Chao SongZhen Wang, Fangli Liu, Zlatko Papić, Lei Ying, H. Wang, Ying Cheng Lai

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Quantum many-body scarring (QMBS) is a recently discovered form of weak ergodicity breaking in strongly interacting quantum systems, which presents opportunities for mitigating thermalization-induced decoherence in quantum information processing applications. However, the existing experimental realizations of QMBS are based on systems with specific kinetic constrains. Here we experimentally realize a distinct kind of QMBS by approximately decoupling a part of the many-body Hilbert space in the computational basis. Utilizing a programmable superconducting processor with 30 qubits and tunable couplings, we realize Hilbert space scarring in a non-constrained model in different geometries, including a linear chain and quasi-one-dimensional comb geometry. By reconstructing the full quantum state through quantum state tomography on four-qubit subsystems, we provide strong evidence for QMBS states by measuring qubit population dynamics, quantum fidelity and entanglement entropy after a quench from initial unentangled states. Our experimental findings broaden the realm of scarring mechanisms and identify correlations in QMBS states for quantum technology applications.

Original languageEnglish (US)
Pages (from-to)120-125
Number of pages6
JournalNature Physics
Issue number1
StatePublished - Jan 2023

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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