Perfect state transfer on a spin chain without state initialization

Phys Rev Lett. 2008 Dec 5;101(23):230502. doi: 10.1103/PhysRevLett.101.230502. Epub 2008 Dec 3.

Abstract

We demonstrate that perfect state transfer can be achieved using an engineered spin chain and clean local end-chain operations, without requiring the initialization of the state of the medium nor fine-tuning of control pulses. This considerably relaxes the prerequisites for obtaining reliable transfer of quantum information across interacting-spin systems. Moreover, it allows us to shed light on the interplay among purity, entanglement, and operations on a class of many-body systems potentially useful for quantum information processing tasks.