A Simple Scheme to Entangle Distant Qubits from a Mixed State via an Entanglement Mediator | Zendy

Kazuya Yuasa | Zendy; Hiromichi Nakazato | Zendy

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A Simple Scheme to Entangle Distant Qubits from a Mixed State via an Entanglement Mediator

Author(s) -

Kazuya Yuasa,

Hiromichi Nakazato

Publication year - 2005

Publication title -

progress of theoretical physics

Language(s) - English

Resource type - Journals

eISSN - 1347-4081

pISSN - 0033-068X

DOI - 10.1143/ptp.114.523

Subject(s) - quantum entanglement , qubit , physics , cluster state , quantum mechanics , w state , state (computer science) , simple (philosophy) , coupling (piping) , scheme (mathematics) , entanglement distillation , coupling constant , topology (electrical circuits) , computer science , algorithm , quantum , mathematics , combinatorics , mechanical engineering , mathematical analysis , philosophy , epistemology , engineering

A simple scheme to prepare an entanglement between two separated qubits froma given mixed state is proposed. A single qubit (entanglement mediator) isrepeatedly made to interact locally and consecutively with the two qubitsthrough rotating-wave couplings and is then measured. It is shown that we needto repeat this kind of process only three times to establish a maximallyentangled state directly from an arbitrary initial mixed state, with no need toprepare the state of the qubits in advance or to rearrange the setup step bystep. Furthermore, the maximum yield realizable with this scheme is compatiblewith the maximum entanglement, provided that the coupling constants areproperly tuned.Comment: 9 pages, 3 figures; the version accepted for publication (with the new title

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