Two Toy Spin Chain Models of Decoherence

Cheng-Yan Lai, Pochung Chen

Peng Zhu

We solve for the decoherence dynamics of two models in which a simple qubit or Central Spin couples to a bath of spins; the bath is made from a chain of spins. In model 1, the bath spins are Ising spins; in Model 2, they are coupled by transverse spin-spin interactions, and the chain supports spin waves. We look at (i) the case where the Hamiltonian is static, with a constant system/bath coupling, and (ii) where this coupling varies in time.

Marcin Wieśniak

The description of the dynamics of closed quantum systems, governed by the Schroedinger equation at first sight seems incompatible with the Lindblad equation describing open ones. By analyzing closed dynamics of a spin-1/2 chain we reconstruct exponential decays characteristic for the latter model. We identify all necessary ingredients to efficiently model this behavior, such as an infinitely large environment and the coupling to the system weak in comparison to the internal couplings in the bath.

Hans A. De Raedt, V. V. Dobrovitski

Tristen Pierson

Simulation study preregistration: whether lawful residue-conditioned texture statistics in a spin-chain bottleneck model require the cyclic reconfiguration step, or are generated by a single unitary decompression trajectory.

V. V. Dobrovitski