Experimental Measurement of Lower and Upper Bounds of Concurrence for Mixed Quantum States

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dc.creatorNiu, Xiao-Ling
dc.creatorGong, Yan-Xiao
dc.creatorLi, Jian
dc.creatorPeng, Liang
dc.creatorZhang, Cheng-Jie
dc.creatorZhang, Yong-Sheng
dc.creatorHuang, Yun-Feng
dc.creatorGuo, Guang-Can
dc.date2008-08-06
dc.date.accessioned2026-07-07T09:54:58Z
dc.date.available2026-07-07T09:54:58Z
dc.descriptionWe experimentally measure the lower and upper bounds of concurrence for a set of two-qubit mixed quantum states using photonic systems. The measured concurrence bounds are in agreement with the results evaluated from the density matrices reconstructed through quantum state tomography. In our experiment, we propose and demonstrate a simple method to provide two faithful copies of a two-photon mixed state required for parity measurements: Two photon pairs generated by two neighboring pump laser pulses through optical parametric down conversion processes represent two identical copies. This method can be conveniently generalized for entanglement estimation of multi-photon mixed states.
dc.description4 pages, 2 figures
dc.identifierhttps://arxiv.org/abs/0808.0776
dc.identifierhttp://arxiv.org/abs/0808.0776
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/166515
dc.subjectQuantum Physics
dc.titleExperimental Measurement of Lower and Upper Bounds of Concurrence for Mixed Quantum States
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