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Quantum Electronics and Laser Science Conference

Analysis of entanglement in the double slit interference patterns of down converted photon pairs

Gen Taguchi, T. Hirama, Katsuya Kasai, Tatsuo Dougakiuchi, Holger Friedrich Hofmann, Yutaka Kadoya

Published May 1, 2007• 0 citations
Publisher

Abstract

We investigate the non-classical correlation of two entangled photons passing through a pair of double slits. The quantum state is reconstructed using quantum tomography based on the correlated interference patterns and slit images.
DOI
10.1109/qels.2007.4431723

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In this work, we study the role of quantum entanglement in a double-slit Young interference experiment that uses a pair of photons generated by parametric down-conversion. The quantum state of these photons is calculated for a general case, where they are transmitted through apertures placed in their paths. Considering those apertures as double-slits we show that is possible to treat this system as two qubits. In this way we relate the fourth-order interference patterns with the degree of entanglement of twin photons. 1
The double-slit experiment strikingly demonstrates the wave-particle duality of quantum objects. In this famous experiment, particles pass one-by-one through a pair of slits and are detected on a distant screen. A distinct wave-like pattern emerges after many discrete particle impacts as if each particle is passing through both slits and interfering with itself. Here we present a temporally- and spatially-resolved measurement of the double-slit interference pattern using single photons. We send single photons through a birefringent double-slit apparatus and use a linear array of single-photon detectors to observe the developing interference pattern. The analysis of the buildup allows us to compare quantum mechanics and the corpuscular model, which aims to explain the mystery of single-particle interference. Finally, we send one photon from an entangled pair through our double-slit setup and show the dependence of the resulting interference pattern on the twin photon's measured state. Our results provide new insight into the dynamics of the buildup process in the double-slit experiment, and can be used as a valuable resource in quantum information applications.