Qubit state guidance without feedback

Mauro Paternostro, Myungshik Kim

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


We study a protocol for two-qubit-state guidance that does not rely on feedback mechanisms. In our scheme, entanglement can be concentrated by arranging the interactions of the qubits with a continuous variable ancilla. By properly post-selecting the outcomes of repeated measurements performed on the state of the ancilla, the qubit state is driven to have a desired amount of purity and entanglement. We stress the primary role played by the first iterations of the protocol. Inefficiencies in the detection operations can be fully taken into account. We also discuss the robustness of the guidance protocol to the effects of an experimentally motivated model for mixedness of the ancillary states.
Original languageEnglish
Article number043
Pages (from-to)43-44
Number of pages2
JournalNew Journal of Physics
Publication statusPublished - 07 Feb 2005

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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