Analyzing the impact of noise on qubits

Noise is an irreducible feature in current applications of quantum information.

In quantum systems, noise presents a unique challenge; not only does it change the state but it does so in a way that we don’t control. The randomness of the occurrence of noise is described through the use of probability. There are various ways to incorporate the presence of noise in the quantum formalism, especially for multi-qubit and entangled systems.



In this study, we apply and analyze the different ways to introduce noise, including the Kraus operators and the reconstructed density operator; we look at the effect on the system when introducing noise in one of the subsystems only; we examine the fragility under different types of noise of the entangled states as a function of their concurrence, including the differences between GHZ and W states.

By examining these properties of noise, we aim to provide a deeper understanding of how noise alters quantum states and how noise control can contribute to applications in quantum information.