State transfer in intrinsic decoherence spin channels

TL;DR

This paper analytically examines how intrinsic decoherence affects quantum state transfer and entanglement in spin chains, revealing degradation over distance and proposing modified chains for improved transfer fidelity.

Contribution

The study provides an analytical solution to the master equation for intrinsic decoherence in spin channels and proposes modified chains to mitigate decoherence effects.

Findings

Decoherence destroys ideal spin channel performance.

Fidelity and entanglement decrease with chain length and decoherence rate.

Modified chains can achieve near-perfect transfer despite decoherence.

Abstract

By analytically solving the master equation, we investigate quantum state transfer, creation and distribution of entanglement in the model of Milburn's intrinsic decoherence. Our results reveal that the ideal spin channels will be destroyed by the intrinsic decoherence environment, and the detrimental effects become severe as the decoherence rate $\gamma$ and the spin chain length $N$ increase. For infinite evolution time, both the state transfer fidelity and the concurrence of the created and distributed entanglement approach steady state values, which are independent of the decoherence rate $\gamma$ and decrease as the spin chain length $N$ increases. Finally, we present two modified spin chains which may serve as near perfect spin channels for long distance state transfer even in the presence of intrinsic decoherence environments $\mathcal {F}{[\rho(t)]}$.