Demonstration of entanglement purification and swapping protocol to design quantum repeater in IBM quantum computer

Bikash K. Behera, Swarnadeep Seth, Antariksha Das, Prasanta K. Panigrahi*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

55 Citations (Scopus)
5 Downloads (Pure)


Quantum communication is a secure way to transfer quantum information and to communicate with legitimate parties over distant places in a network. Although communication over a long distance has already been attained, technical problem arises due to unavoidable loss of information through the transmission channel. Quantum repeaters can extend the distance scale using entanglement swapping and purification scheme. Here we demonstrate the working of a quantum repeater by the above two processes. We use IBM’s real quantum processor ‘ibmqx4’ to create two pair of entangled qubits and design an equivalent quantum circuit which consequently swaps the entanglement between the two pairs. We then develop a novel purification protocol which enhances the degree of entanglement in a noisy channel that includes combined errors of bit-flip, phase-flip and phase-change error. We perform quantum state tomography to verify the entanglement swapping between the two pairs of qubits and working of the purification protocol.

Original languageEnglish
Article number108
Number of pages13
JournalQuantum Information Processing
Issue number4
Publication statusPublished - 2019

Bibliographical note

This version of this article was revised: Due to the cancellation of a retrospective Open Access order. A correction to this article is available online at


  • IBM quantum experience
  • Quantum communication
  • Quantum repeater


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