Quantum states prepared by realistic entanglement swapping

Details Quantum states prepared by realistic entanglement swapping Quantum states prepared by realistic entanglement swapping

2009-04-07

arxiv.org/abs/0904.1184v2

Phys. Rev. A 80, 062310 (2009)

Physics

Quantum Physics

44 pages, 7 figures, Published with minor changes in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.80.062310

Entanglement swapping between photon pairs is a fundamental building block in schemes using quantum relays or quantum repeaters to overcome the range limits of long-distance quantum key distribution. We develop a closed-form solution for the actual quantum states prepared by realistic entanglement swapping, which takes into account experimental deficiencies due to inefficient detectors, detector dark counts, and multiphoton-pair contributions of parametric down-conversion sources. We investigate how the entanglement present in the final state of the remaining modes is affected by the real-world imperfections. To test the predictions of our theory, comparison with previously published experimental entanglement swapping is provided.

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