Quantum qubit switch: entropy and entanglement

TL;DR

This paper analyzes the entanglement levels in a quantum switch during operation, using entropy and concurrence measures to detect noise and assess proper functioning in quantum computing systems.

Contribution

It introduces formulas for entanglement measurement in a quantum switch and demonstrates how these can be used to identify noise and verify correct operation.

Findings

Entanglement levels vary with noise presence.

Concurrence and entropy effectively detect noise.

Method helps ensure quantum switch reliability.

Abstract

The quantum entanglement is considered as one of the most important notions of quantum computing. The entanglement is a feature of quantum systems and it is used as a basis for many quantum algorithms and protocols. In this paper we analyze the level of entanglement for the quantum switch, during its work. The level of entanglement during the correct operating may be compared with the situation when a noise is present in the analyzed system. The noise changes the level of quantum entanglement and we utilize this observation to evaluate if the switch works properly. We present the formulae describing the value of entanglement with use of the Concurrence measure and also the value of entropy. Both mentioned values may be utilized to detect the noise during the operating of quantum switch.