Finding Traps in Non-Linear Spin Arrays

Autor(en)

Marcin Adam Wiesniak, Marcin Markiewicz

Abstrakt

Precise knowledge of the Hamiltonian of a system is a key to many of its applications. Tasks such as the state transfer or quantum computation have been well studied with a linear chain, but rarely with systems, which do not possess a linear structure. While this difference does not disturb the end-to-end dynamics of a single excitation, the evolution is significantly changed in other subspaces. Here we quantify the difference between a linear chain and a pseudochain, which have more than one spin at some site (in such a case we will call the site a block). We show how to estimate a number of all spins in the system and the intrablock coupling constants. We also suggest how it is possible to eliminate excitations trapped in such blocks, which may disturb the state transfer. Importantly, one uses only at-ends data and needs to be able to put the system to either the maximally magnetized or the maximally mixed state. This can obtained by controlling a global decoherence parameter, such as temperature.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

University of Gdańsk

Journal

Physical Review A

Band

81

Anzahl der Seiten

5

ISSN

1050-2947

DOI

https://doi.org/10.1103/PhysRevA.81.032340

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

103026 Quantenoptik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/4001bb91-f3c8-40fa-9e97-fcc3d7a30e2a