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Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

Physical approximation of the partial transpose and its application to entanglement detection

Hyang‐Tag Lim, Yong‐Su Kim, Young-Sik Ra, Joonwoo Bae, Yoon-Ho Kim

Published Jun 1, 2013• 0 citations

Abstract

We report the first experimental implementation of an approximate partial transpose operation for photonic two-qubit systems. Direct detection of entanglement using the partial transpose operation is also demonstrated without performing quantum state tomography.

DOI: 10.1109/cleopr.2013.6600354

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The partial transpose by which a subsystem's quantum state is solely transposed is of unique importance in quantum information processing from both fundamental and practical point of view. In this work, we present a practical scheme to realize a physical approximation to the partial transpose using local measurements on individual quantum systems and classical communication. We then report its linear optical realization and show that the scheme works with no dependence on local basis of given quantum states. A proof-of-principle demonstration of entanglement detection using the physical approximation of the partial transpose is also reported.