Kavli Affiliate: Ke Wang
| First 5 Authors: Pengfei Zhang, Hang Dong, Yu Gao, Liangtian Zhao, Jie Hao
| Summary:
Thermalization in complex and strongly interacting quantum many-body systems
represents an obstacle to applications. It was recently suggested theoretically
that quantum many-body scarring (QMBS) states embedded in the thermalized
energy spectrum can overcome this difficulty. Here, by programming a
superconducting circuit of two-dimensional multiqubit array with tunable
couplings, we experimentally investigate the slow quantum thermalization
dynamics associated with QMBS states in the paradigmatic settings of chain and
comb tensor topologies, which are effectively described by the unconstrained
spin model. Robust QMBS states have been successfully observed in a
superconducting circuit of up to $30$ qubits with an extraordinarily large
Hilbert space for exact diagonalization simulations of classical computers. The
QMBS states can be readily distinguished from the conventional thermalized
states through the population dynamics, the entanglement entropy, and the
fidelity, paving the way to exploiting these states for mitigating quantum
thermalization for significant applications in quantum information science and
technology.
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