Quantum conditional mutual information of W state in non-inertial frames

Abstract

Quantum conditional mutual information (QCMI) is a versatile information theoretic measure. It is used to find the amount of correlations between two qubits from the perspective of a third qubit. In this work, we characterise the QCMI of tripartite W-states when some of the qubits are in accelerated motion. Here for our investigations we consider a massless fermionic field in the single-mode approximation. We consider all possible situations with respect to the acceleration of the qubits. From our results, we observe that QCMI can either increase or decrease depending on the role of the qubit being accelerated. Finally we discuss the connection between QCMI and correlations by studying the biseparable and separable states.