Lossless information transfer along the causal lightcone in brickwork quantum circuits is enabled by peripheral eigenvalues of the M-qudit channel Φ_M, with examples for arbitrary N even in nonintegrable thermalising dynamics.
Dooley, Robust quantum sensing in strongly interact- ing systems with many-body scars, PRX Quantum2, 020330 (2021)
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First experimental signatures of asymptotic quantum many-body scars on a trapped-ion simulator show thermalization times increasing with system size up to 20 qubits.
Exact condensate-pair eigenstates are built for Fermi ladders under SU(2) symmetry via spectrum generating algebra and mapped to Bose ladders by operator replacement, revealing pair equivalence and a possible Hilbert-space fragmentation mechanism.
Side coupling of free spins to Ising models on lattices fragments the Hilbert space into exponentially many decoupled sectors at resonance between transverse field and coupling, inducing quantum scars.
Transverse spin helices in XXZ chains with single-ion anisotropy decay slowly for chosen wave numbers and can be stabilized by easy-axis exchange anisotropy, per iTEBD simulations and spin-wave estimates.
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Decay of spin helices in XXZ quantum spin chains with single-ion anisotropy
Transverse spin helices in XXZ chains with single-ion anisotropy decay slowly for chosen wave numbers and can be stabilized by easy-axis exchange anisotropy, per iTEBD simulations and spin-wave estimates.