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Deutsche Physikalische Gessellschaft IOP Institute of Physics

Quantum teleportation and entanglement swapping with linear optics logic gates

Christian Schmid1,2,5, Nikolai Kiesel1,2, Ulrich K Weber3, Rupert Ursin4, Anton Zeilinger4 and Harald Weinfurter1,2

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We report on the usage of a linear optics phase gate for distinguishing all four Bell states simultaneously in a quantum teleportation and entanglement swapping protocol. This is demonstrated by full-state tomography of the one- and two-qubit output states of the two protocols, yielding average state fidelities of about 0.83 and 0.77, respectively. In addition, the performance of the teleportation channel is characterized by the quantum process tomography. The non-classical properties of the entanglement swapping output states are further confirmed by the violation of a CHSH-type Bell inequality of 2.14 on average.


PACS

42.50.Dv Quantum state engineering and measurements

03.67.Mn Entanglement measures, witnesses, and other characterizations

03.67.Hk Quantum communication

03.65.Ud Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.)

Subjects

Computational physics

Optics, quantum optics and lasers

Quantum information and quantum mechanics

Dates

Issue 3 (March 2009)

Received 20 November 2008

Published 4 March 2009



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