The Scope of a Relativistic Quantum Process with Spin-Momentum Entanglement

摘要

Using an imperfectly prepared state, we show that under a Lorentz transformation, the evolution of a massive spin-1/2 particle violates many standard assumptions made in quantum information theory, including complete positivity. Unlike other recent endeavors in relativistic quantum information, we are able to quantify and maximize how much information can be transferred through such a quantum process by calculating the scope. We show that, surprisingly, in many instances the relativistic noise increases the amount of information that can be transferred, and in fact, even if the initial state is arbitrarily close to the completely mixed state, information can still be transferred perfectly.