Abstract

We present an experimental proof-of-principle for the generation and detection of pure two-qubit states that have been encoded in degrees of freedom that are common to both classical-light beams and single photons. Our protocol requires performing polarization tomography on a single qubit from a qubit pair. The degree of entanglement in the qubit pair is measured by concurrence, which can be directly extracted from intensity measurements—or photon counting—entering single-qubit polarization tomography.

© 2019 Optical Society of America

Revisiting comparison between entanglement measures for two-qubit pure states

Ashutosh Singh, Ijaz Ahamed, Dipankar Home, and Urbasi Sinha
J. Opt. Soc. Am. B 37(1) 157-166 (2020)

Compact generation of a two-photon multipath Dicke state from a single χ⁽²⁾ nonlinear photonic crystal

Hua-ying Liu, Rong Zhang, Ping Xu, Zhen-da Xie, Yan-xiao Gong, and Shi-ning Zhu
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Quantum nonlocality for entanglement of quasiclassical states

Zhi-Rong Zhong, Jian-Qi Sheng, Li-Hua Lin, and Shi-Biao Zheng
Opt. Lett. 44(7) 1726-1729 (2019)

Experimental display of the extended polarization coherence theorem

P. Sánchez, J. Gonzales, V. Avalos, F. Auccapuclla, E. Suarez, and F. De Zela
Opt. Lett. 44(4) 1052-1055 (2019)

Concepts in quantum state tomography and classical implementation with intense light: a tutorial

Ermes Toninelli, Bienvenu Ndagano, Adam Vallés, Bereneice Sephton, Isaac Nape, Antonio Ambrosio, Federico Capasso, Miles J. Padgett, and Andrew Forbes
Adv. Opt. Photon. 11(1) 67-134 (2019)