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| Format: | Artículo científico |
| Language: | en |
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Sociedade Brasileira de Física
2015
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| Online Access: | https://www.redalyc.org/articulo.oa?id=46442559009 |
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Table of Contents:
- Non-monotonicity of Trace Distance Under Tensor Products Jonas Maziero Física, Astronomía y Matemáticas Trace distance Quantum distance measures Monotonicity under tensor products The trace distance (TD) possesses several of the good properties required for a faithful distance measure in the quantum state space. Despite its importance and ubiquitous use in quantum information science, one of its questionable features, its possible non-monotonicity under taking tensor products of its arguments (NMuTP), has been hitherto unexplored. In this article, we advance analytical and numerical investigations of this issue considering different classes of states living in a discrete and finite dimensional Hilbert space. Our results reveal that although this property of TD does not show up for pure states and for some particular classes of mixed states, it is present in a non-negligible fraction of the regarded density operators. Hence, even though the percentage of quartets of states leading to the NMuTP drawback of TD and its strength decrease as the system’s dimension grows, this property of TD must be taken into account before using it as a figure of merit for distinguishing mixed quantum states. 2015 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46442559009 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.5 Vol.45