Distillation of logic-qubit entanglement assisted with cross-Kerr nonlinearity

TL;DR

This paper proposes an efficient protocol utilizing cross-Kerr nonlinearity to purify and correct errors in logic-qubit entanglement, enhancing its robustness for quantum communication and computation.

Contribution

It introduces a novel distillation protocol that corrects both logic and physical errors in logic-qubit entanglement using cross-Kerr nonlinearity.

Findings

Successfully purifies logic bit-flip and phase-flip errors

Complete correction of physical bit-flip errors achieved

Potential for improved long-distance quantum communication

Abstract

Logic-qubit entanglement has attracted much attention in both quantum communication and quantum computation. Here, we present an efficient protocol to distill the logic-qubit entanglement with the help of cross-Kerr nonlinearity. This protocol not only can purify the logic bit-flip error and logic phase-flip error, but also can correct the physical bit-flip error completely. We use cross-Kerr nonlinearity to construct quantum nondemolition detectors. Our distillation protocol for logic-qubit entanglement may be useful for the practical applications in quantum information, especially in long-distance quantum communication.