A simple scheme to entangle distant qubits from a mixed state via an entanglement mediator

Kazuya Yuasa*, Hiromichi Nakazato

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


A simple scheme to prepare an entanglement between two separated qubits from a given mixed state is proposed. A single qubit (entanglement mediator) is repeatedly made to interact locally and consecutively with the two qubits through rotating-wave couplings and is then measured. It is shown that we need to repeat this kind of process only three times to establish a maximally entangled state directly from an arbitrary initial mixed state, with no need to prepare the state of the qubits in advance or to rearrange the setup step by step. Furthermore, the maximum yield realizable with this scheme is compatible with the maximum entanglement, provided that the coupling constants are properly tuned.

Original languageEnglish
Pages (from-to)523-531
Number of pages9
JournalProgress of Theoretical Physics
Issue number3
Publication statusPublished - 2005 Sept

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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