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Relation Between Stereographic Projection and Concurrence Measure in Bipartite Pure States

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Abstract

One-qubit pure states, living on the surface of Bloch sphere, can be mapped onto the usual complex plane by using stereographic projection. In this paper, after reviewing the entanglement of two-qubit pure state, it is shown that the quaternionic stereographic projection is related to concurrence measure. This is due to the fact that every two-qubit state, in ordinary complex field, corresponds to the one-qubit state in quaternionic skew field, called quaterbit. Like the one-qubit states in complex field, the stereographic projection maps every quaterbit onto a quaternion number whose complex and quaternionic parts are related to Schmidt and concurrence terms respectively. Rather, the same relation is established for three-qubit state under octonionic stereographic projection which means that if the state is bi-separable then, quaternionic and octonionic terms vanish. Finally, we generalize recent consequences to 2⊗N and 4⊗N dimensional Hilbert spaces (N ≥ 2) and show that, after stereographic projection, the quaternionic and octonionic terms are entanglement sensitive. These trends are easily confirmed by direct computation for general multi-particle W- and GHZ-states.

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Acknowledgments

The authors also acknowledge the support from the Mohaghegh Ardabili University.

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Authors and Affiliations

  1. Department of Physics, University of Mohaghegh Ardabili, Ardabil, 179, Iran

    G. Najarbashi & B. Seifi

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  1. G. Najarbashi
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  2. B. Seifi
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Correspondence to G. Najarbashi.

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Najarbashi, G., Seifi, B. Relation Between Stereographic Projection and Concurrence Measure in Bipartite Pure States. Int J Theor Phys 55, 4480–4491 (2016). https://doi.org/10.1007/s10773-016-3071-2

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  • DOI: https://doi.org/10.1007/s10773-016-3071-2

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