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15 October 2012 Experimental realization of an approximate partial transpose for photonic two-qubit systems
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Abstract
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.
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Hyang-Tag Lim, Yong-Su Kim, Young-Sik Ra, Joonwoo Bae, and Yoon-Ho Kim "Experimental realization of an approximate partial transpose for photonic two-qubit systems", Proc. SPIE 8518, Quantum Communications and Quantum Imaging X, 85180N (15 October 2012); https://doi.org/10.1117/12.927994
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