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CRC Press eBooks

Multiphoton-Entangled States from Two-Crystal Geometry Parametric Down-Conversion and Their Application in Quantum Teleportation

Takayoshi Kobayashi

Published Oct 15, 2025• 0 citations
Publisher

Abstract

In this subsection, we show that two kinds of W-type entangled states can be generated from a nondegenerate two-crystal geometry parametric down-conversion, and they are very useful for quantum teleportation and quantum cloning. We also show that quantum teleportation of an unknown one-particle state from a sender to either one of three receivers can be realized probabilistically by using the four-photon entangled state directly from a degenerate two-crystal geometry parametric down-conversion.

DOI
10.1201/9781003618997-24

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•Jan 1, 2006•0 citations
In this subsection, we show that two kinds of W-type entangled states can be generated from a nondegenerate two-crystal geometry parametric down-conversion, and they are very useful for quantum teleportation and quantum cloning. We also show that quantum teleportation of an unknown one-particle state from a sender to either one of three receivers can be realized probabilistically by using the four-photon entangled state directly from a degenerate two-crystal geometry parametric down-conversion.
An experimental scheme for producing a four-photon entangled WWW state directly from the parametric down-conversion of a two-crystal geometry is proposed. In our scheme, only linear optical elements and photon detectors are required. Sophisticated and fragile interferometric setups are unnecessary.
Multiphoton entanglement is the basis of many quantum communication schemes, quantum cryptographic protocols, and fundamental tests of quantum theory. Spontaneous parametric down-conversion is the most effective source for polarization entangled photon pairs. Here we show, that a entangled 4-photon state can be directly created by parametric down-conversion. This state exhibit perfect quantum correlations and a high robustness of entanglement against photon loss. We have used this state for four-particle test of local realistic theories. Therefore this state can be used for new types of quantum communication. We also report on possibilities for the experimentally realization of a 3-photon entangled state, the so called W-state, and discuss some of its properties.