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The Peres–Horodecki criterion is a necessary condition, for the joint density matrix of two quantum mechanical systems and , to be separable. It is also called the PPT criterion, for positive partial transpose. In the 2×2 and 2×3 dimensional cases the condition is also sufficient. It is used to decide the separability of mixed states, where the Schmidt decomposition does not apply. The theorem was discovered in 1996 by Asher Peres and the Horodecki family (Michał, Paweł, and Ryszard)

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  • Das Peres-Horodecki-Kriterium (oder PPT-Kriterium von englisch positive partial transpose criterion) für die Dichtematrix eines aus zwei quantenmechanischen Systemen und zusammengesetzten Systems ist eine notwendige Bedingung für die Separabilität der Dichtematrix. Im Falle von 2x2 und 2x3 Dimensionen ist das Peres-Horodecki-Kriterium auch hinreichend, d h. alle Zustände, die das Kriterium erfüllen sind separabel. In höherdimensionalen Räumen ist das Kriterium nicht mehr hinreichend: es gibt auch verschränkte Zustände, die die PPT-Bedingung erfüllen („PPT-verschränkte Zustände“) und weitere Methoden müssen zur Hand genommen werden, um sie von separablen Zuständen zu unterscheiden. (de)
  • The Peres–Horodecki criterion is a necessary condition, for the joint density matrix of two quantum mechanical systems and , to be separable. It is also called the PPT criterion, for positive partial transpose. In the 2×2 and 2×3 dimensional cases the condition is also sufficient. It is used to decide the separability of mixed states, where the Schmidt decomposition does not apply. The theorem was discovered in 1996 by Asher Peres and the Horodecki family (Michał, Paweł, and Ryszard) In higher dimensions, the test is inconclusive, and one should supplement it with more advanced tests, such as those based on entanglement witnesses. (en)
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  • Das Peres-Horodecki-Kriterium (oder PPT-Kriterium von englisch positive partial transpose criterion) für die Dichtematrix eines aus zwei quantenmechanischen Systemen und zusammengesetzten Systems ist eine notwendige Bedingung für die Separabilität der Dichtematrix. (de)
  • The Peres–Horodecki criterion is a necessary condition, for the joint density matrix of two quantum mechanical systems and , to be separable. It is also called the PPT criterion, for positive partial transpose. In the 2×2 and 2×3 dimensional cases the condition is also sufficient. It is used to decide the separability of mixed states, where the Schmidt decomposition does not apply. The theorem was discovered in 1996 by Asher Peres and the Horodecki family (Michał, Paweł, and Ryszard) (en)
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  • Peres-Horodecki-Kriterium (de)
  • Peres–Horodecki criterion (en)
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