Scott W. Brown, Hyponormal Operators with Thick Spectra have Invariant Subspaces, Annals of Mathematics, Vol. 125, No. 1 (Jan., 1987), pp. 93-103 ...

Ali Jafarian, Alexey I. Popov, Heydar Radjavi, Common Invariant Subspaces from Small Commutators, Indiana University Mathematics Journal, Vol. 67, No. 1 (2018), pp ...

This study demonstrates how integrating decoherence-free subspaces with dynamical decoupling enhances quantum state fidelity, offering a practical route to more noise-resilient quantum computing ...