Perfect State Transfer without State Initialization and Remote Collaboration

TL;DR

This paper introduces a perfect quantum state transfer protocol along a qubit chain that does not require remote state initialization or classical communication, relying only on access to the chain's ends.

Contribution

The proposed method enables perfect state transfer without initial chain state preparation or classical communication, simplifying quantum information transfer protocols.

Findings

Achieves perfect state transfer without chain initialization.

Requires access only to the end spins of the chain.

Operates under the $xx$ Hamiltonian dynamics.

Abstract

We present a perfect state transfer protocol via a qubit chain with the evolution governed by the $xx$ Hamiltonian. In contrast to the recent protocol announced in [Phys. Rev. Lett. {\bf 101}, 230502 (2008)], our method does not demand any remote-cooperated initialization and sending classical information about measurement outcomes. We achieve the perfect state transfer only with the assumption of access to two spins at each end of the chain, while the initial state of the whole chain is irrelevant.