Quantum eraser from duality--entanglement perspective

TL;DR

This paper explains quantum eraser phenomena through the duality-entanglement relation, showing how partial erasure of which-path information can recover interference, thus extending quantum eraser protocols.

Contribution

It introduces a duality-entanglement framework to quantitatively understand quantum eraser effects, highlighting the triality among wave, particle, and entanglement.

Findings

Quantum eraser can be understood via duality-entanglement relation.

Partial erasure of which-path info enables partial interference recovery.

The framework extends conventional quantum eraser protocols.

Abstract

Wave-particle duality is a bizarre feature at the heart of quantum mechanics which refers to the mutually exclusive dual attributes of quantum objects as the wave and the particle. Quantum eraser presents a counterintuitive aspect of the wave-particle duality. In this work, we show that quantum eraser can be quantitatively understood in terms of the recently developed duality--entanglement relation. In other words, we show that wave-particle-entanglement triality captures all the physics of the quantum erasure. We find that a controllable partial erasure of the which-path information is attainable, enabling the partial recovery of the quantum interference and extending the scope of the conventional quantum eraser protocols.