# Entanglement sudden death and birth effects in two qubits maximally entangled mixed states under quantum channels

## TL;DR

This paper investigates how different quantum channels affect entanglement in two-qubit maximally entangled mixed states, revealing phenomena like entanglement sudden death and rebirth, with some channels showing more robustness than others.

## Contribution

It provides a comprehensive analysis of entanglement dynamics under various quantum channels, highlighting conditions for sudden death and rebirth in MEMS.

## Key findings

- Bit flip and bit-phase-flip channels cause entanglement sudden death and rebirth.
- Amplitude damping leads to entanglement sudden death without rebirth.
- MEMS show robustness against phase flip, phase damping, and depolarization channels.

## Abstract

In the present article, the robustness of entanglement in two qubits maximally entangled mixed states (MEME) have been studied under quantum decoherence channels. Here we consider bit flip, phase flip, bit-phase-flip, amplitude damping, phase damping and depolarization channels. To quantify the entanglement, the concurrence has been used as an entanglement measure. During this study interesting results have been found for sudden death and birth of entanglement under bit flip and bit-phase-flip channels. While amplitude damping channel produces entanglement sudden death and does not allow re-birth of entanglement. On the other hand, two qubits MEMS exhibit the robust character against the phase flip, phase damping and depolarization channels. The elegant behavior of all the quantum channels have been investigated with varying parameter of quantum state MEMS in different cases.