5 papers · 1 filter
Polaron formation in a spin chain by measurement-induced imaginary Zeeman field
P. V. Pyshkin, E. Ya. Sherman, Lian-Ao Wu
We present a high-rate projective measurement-based approach for controlling non-unitary evolution of a quantum chain of interacting spins. In this approach, we demonstrate that lo…
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…