Schemes to avoid entanglement sudden death of decohering two qubit system

TL;DR

This paper explores methods to prevent entanglement sudden death in two-qubit systems by using local quantum gates, enhancing entanglement longevity crucial for quantum information processing.

Contribution

It introduces analytical strategies for applying local unitary operations to delay or avoid entanglement sudden death in two-qubit systems.

Findings

Local quantum gates can delay or prevent ESD.

Timing of operations is critical for avoiding ESD.

Entanglement revival can be enhanced with specific gates.

Abstract

We investigate the entanglement dynamics of two interacting qubits in a common vacuum environment. The inevitable environment interaction leads to entanglement sudden death (ESD) in a two qubit entangled state system. The entanglement dynamics can be modified by the use of local unitary operations (quantum gates), applied on the system during its evolution. We show that these operations not only delays or avoids the ESD but also advances the entanglement revival with high concurrence value depending on the time of operation. We have analytically found out different time windows for switching with different quantum gates so that the ESD can be completely avoided in the subsequent evolution of the system. Our result offers practical applications in the field of quantum information processing where the entanglement is a necessary resource.