Two-Way Quantum Communication: `Secure Quantum Information Exchange'-II. Generalization to Arbitrary Number of Qubits

TL;DR

This paper extends a secure quantum information exchange protocol to handle arbitrary numbers of qubits, enhancing the flexibility and security of quantum communication between two parties with a controller.

Contribution

The authors generalize the SQIE protocol from single-qubit to multi-qubit exchange, analyzing security aspects related to the number of qubits controlled by a third party.

Findings

Successful generalization to arbitrary qubit numbers

Security analysis with respect to controller's qubits

Enhanced protocol flexibility for quantum communication

Abstract

In this paper, we generalize the secure quantum information exchange (SQIE) protocol, originally proposed by the authors [J. Phys. B: At. Mol. Opt. Phys. 44 (2011) 115504] for secure exchange of one qubit information with each of Alice and Bob, to the case of secure exchange of quantum information of arbitrary qubits with Alice and Bob. We also discuss security of the original and generalized SQIE protocols with respect to the number of qubits with controller, Charlie.