Entanglement sudden death in qubit-qutrit systems

TL;DR

This paper demonstrates that entanglement sudden death can occur in qubit-qutrit systems under local dephasing noise, extending the understanding of entanglement dynamics in mixed quantum states.

Contribution

It provides the first evidence of entanglement sudden death in qubit-qutrit systems and supports the conjecture that ESD occurs in all bipartite quantum systems.

Findings

ESD occurs in qubit-qutrit systems with certain mixed states

ESD is induced by local dephasing noise

Supports the universality of ESD in bipartite systems

Abstract

We demonstrate the existence of entanglement sudden death (ESD), the complete loss of entanglement in finite time, in qubit-qutrit systems. In particular, ESD is shown to occur in such systems initially prepared in a one-parameter class of entangled mixed states and then subjected to local dephasing noise. Together with previous results, this proves the existence of ESD for some states in all quantum systems for which rigorously defined mixed-state entanglement measures have been identified. We conjecture that ESD exists in all quantum systems prepared in appropriate bipartite states.