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Active teleportation and entanglement swapping of a vacuum‐one photon qubit
Author(s) -
Sciarrino F.,
Lombardi E.,
Giacomini S.,
De Martini F.
Publication year - 2003
Publication title -
fortschritte der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.469
H-Index - 71
eISSN - 1521-3978
pISSN - 0015-8208
DOI - 10.1002/prop.200310046
Subject(s) - quantum teleportation , teleportation , superdense coding , quantum entanglement , physics , quantum mechanics , qubit , photon , realization (probability) , quantum computer , quantum channel , topology (electrical circuits) , quantum , mathematics , electrical engineering , engineering , statistics
We report the experimental realization of the “active” quantum teleportation (QST) of a one‐particle entangled qubit. The qubit is physically implemented by a two‐dimensional subspace of states of a mode of the electromagnetic field, specifically, the space spanned by the vacuum and the one photon state. This demonstration completes the original QST protocol and renders it available for actual implementation in quantum computation networks. It is accomplished by implementing a 8 m optical delay line and a single‐photon triggered fast Electro‐Optic Pockels cell. A large value of teleportation “fidelity” was attained: F a = 90 ∓ 2)%. Furthermore we present a scheme for delayed‐entanglement swapping by applying the same quantum optical method.