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Studies in computational intelligence

Realization of Original Quantum Entanglement State from Mixing of Four Entangled Quantum States

Kisalaya Chakrabarti

Published Jan 1, 2020• 5 citations
Publisher
DOI
10.1007/978-3-030-34152-7_12

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Quantum entanglement exhibits various interesting features that emerge only in high-dimensional systems. One of the most fascinating is bound entanglement, entanglement that cannot be extracted using local operations and classical communication. This thesis describes our work towards an experimental realization of the four-qubit bound-entangled Smolin state, using the polarization and spatial mode of photon pairs. We describe a number of interesting experimental challenges that this work faced. We present our results on entangled two-qubit spatial mode states and hyperentangled four-qubit polarization-spatial-mode states generated by spontaneous parametric down-conversion from a second-order TEM mode pump. Some of the subtleties involved in preparing genuine mixed states in the lab are discussed.