Steering Witness and Steering Criterion of Gaussian States
Keyword(s):
Quantum steering is an important quantum resource, which is intermediate between entanglement and Bell nonlocality. In this paper, we study steering witnesses for Gaussian states in continuous-variable systems. We give a definition of steering witnesses by covariance matrices of Gaussian states, and then obtain a steering criterion by steering witnesses to detect steerability of any (m+n)-mode Gaussian states. In addition, the conditions for two steering witnesses to be comparable and the optimality of steering witnesses are also discussed.
2019 ◽
Vol 17
(04)
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pp. 1950035
2011 ◽
Vol 09
(07n08)
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pp. 1773-1786
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2005 ◽
Vol 12
(02)
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pp. 189-205
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