Effects of Intrinsic Decoherence on Information Transport in a Spin Chain

Anas Ait Chlih, Nabil Habiballah, Mostafa Nassik

M. L. Hu, H. L. Lian

Tian-Hai Zeng, Shao Bin, Zou Jian

Considering Milburn's intrinsic decoherence effect on quantum communication through a spin chain, we show that the transfer quality for quantum state and entanglement will obviously decrease with the increasing intrinsic decoherence rate. Some odd chains are much higher than even ones for the state transfer efficiency. The state transfer of a long chain is very sensitive to the intrinsic decoherence, which turns out to be an obstacle for information transport.

Lionel Tenemeza Kenfack, Moïse Raphaël Tsimbo Fokou, Mathurin Esouague Ateuafack +1 more

Rebecca Ronke, Marta P. Estarellas, Irene D’Amico +2 more

Anderson localisation is an important phenomenon arising in many areas of physics, and here we explore it in the context of quantum information devices. Finite dimensional spin chains have been demonstrated to be important devices for quantum information transport, and in particular can be engineered to allow for “perfect state transfer” (PST). Here we present extensive investigations of disordered PST spin chains, demonstrating spatial localisation and transport retardation effects, and relate these effects to conventional Anderson localisation. We provide thresholds for Anderson localisation in these finite quantum information systems for both the spatial and the transport domains. Finally, we consider the effect of disorder on the eigenstates and energy spectrum of our Hamiltonian, where results support our conclusions on the presence of Anderson localisation.

Nour Zidan