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23 February 2012 Realizing physical approximation of the partial transpose
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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.
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Hyang-Tag Lim, Yong-Su Kim, Young-Sik Ra, Joonwoo Bae, and Yoon-Ho Kim "Realizing physical approximation of the partial transpose", Proc. SPIE 8272, Advances in Photonics of Quantum Computing, Memory, and Communication V, 82720J (23 February 2012);

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