4 papers
Quantum mechanics and speed limit of ultrafast local control in spin chains
P. V. Pyshkin, E. Ya. Sherman, Lian-Ao Wu
We study optimization of fidelity for ultrafast transformation of a spin chain via external control of a local exchange coupling. We show that infidelity of such a process can be d…
Non-adiabatic transformation of a spin-chain geometry via local control
P. V. Pyshkin, E. Ya. Sherman, Lian-Ao Wu
We consider transformation from a closed to an open spin chain and vice versa produced by changing single link strength in a pair of neighboring spins. We show that in the non-adia…
Quantum state identification of qutrits via a nonlinear protocol
P. V. Pyshkin, A. Gábris, O. Kálmán +2
We propose a probabilistic quantum protocol to realize a nonlinear transformation of qutrit states, which by iterative applications on ensembles can be used to distinguish two type…
High-fidelity non-adiabatic cutting and stitching of a spin chain via local control
P. V. Pyshkin, E. Ya. Sherman, J. Q. You +1
We propose and analyze, focusing on non-adiabatic effects, a technique of manipulating quantum spin systems based on local 'cutting' and 'stitching' of the Heisenberg exchange coup…