Constrained dissipation and the lifetime of quantum many-body scars

We investigate the fate of quantum many-body scars in the PXP model subject to Markovian dissipation. We show that when local jump operators respect the same symmetries of the Hamiltonian the full Liouvillian spectrum displays a tower of states with properties analogous to standard quantum scars: large overlaps with Néel states and equally spaced gaps in the imaginary part of the eigenvalues, set by a single frequency. Whether the long-time dynamics is dominated by scars is determined by the real parts of the eigenvalues, which are set by the ratio between the two relaxation rates $γ_{\pm}$ describing spin flips down-to-up or up-to-down respectively. For asymmetric dissipation ($γ_+ > γ_-$) the scarred eigenvalues have the smallest real parts: the resulting enhanced fidelity oscillations are further stabilized by staggered jump operators. In contrast, replacing the full projection operator in the dissipators with a partial one breaks the symmetries of the problem and is seen to destroy dissipative scars altogether.

Source: arXiv:2610.22223v1 - http://arxiv.org/abs/2610.22223v1 PDF: https://arxiv.org/pdf/2610.22223v1 Original Link: http://arxiv.org/abs/2610.22223v1