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Induced measures in the space of mixed quantum states

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Zyczkowski, Karol, Sommers, Hans-Jürgen·2001·Journal of Physics A: Mathematical and General

Abstract

We analyse several product measures in the space of mixed quantum states. In particular, we study measures induced by the operation of partial tracing. The natural, rotationally invariant measure on the set of all pure states of a N × K composite system, induces a unique measure in the space of N × N mixed states (or in the space of K × K mixed states, if the reduction takes place with respect to the first subsystem). For K = N the induced measure is equal to the Hilbert-Schmidt measure, which is shown to coincide with the measure induced by singular values of non-Hermitian random Gaussian matrices pertaining to the Ginibre ensemble. We compute several averages with respect to this measure and show that the mean entanglement of N × N pure states behaves as ln N -1/2.

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Metadata

Authors
Zyczkowski, K., & Sommers, H.-J.
Venue
Journal of Physics A: Mathematical and General
Published
2001-08-24
Volume
34
Issue
35
Pages
7111-7125
ISSN
  • 0305-4470 (ISSN-L)
  • 1361-6447
OpenAlex
W2095222927
Cited by
425
References
23
FWCI
6.13
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Induced measures in the space of mixed quantum states. https://app.cochat.ai/papers/10.1088/0305-4470/34/35/335
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Zyczkowski, K., & Sommers, H.-J. (2001). Induced measures in the space of mixed quantum states. Journal of Physics A: Mathematical and General. https://doi.org/10.1088/0305-4470/34/35/335

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.