Many-body Hilbert space scarring on a superconducting processor

Kavli Affiliate: Ke Wang

| First 5 Authors: Pengfei Zhang, Hang Dong, Yu Gao, Liangtian Zhao, Jie Hao

| Summary:

Quantum many-body scarring (QMBS) — a recently discovered form of weak
ergodicity breaking in strongly-interacting quantum systems — presents
opportunities for mitigating thermalization-induced decoherence in quantum
information processsing. However, the existing experimental realizations of
QMBS are based on kinetically-constrained systems where an emergent dynamical
symmetry "shields" such states from the thermalizing bulk of the spectrum.
Here, we experimentally realize a distinct kind of QMBS phenomena 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 as well
as a quasi-one-dimensional comb geometry. By performing full quantum state
tomography on 4-qubit subsystems, we provide strong evidence for QMBS states by
measuring qubit population dynamics, quantum fidelity and entanglement entropy
following a quench from initial product states. Our experimental findings
broaden the realm of QMBS mechanisms and pave the way to exploiting
correlations in QMBS states for applications in quantum information technology.

| Search Query: ArXiv Query: search_query=au:”Ke Wang”&id_list=&start=0&max_results=10

Read More

Leave a Reply