Zobrazeno 1 - 10
of 92
pro vyhledávání: '"Eltschka, Christopher"'
We present a novel inequality on the purity of a bipartite state depending solely on the difference of the local Bloch vector lengths. For two qubits this inequality is tight for all marginal states and so extends the previously known solution for th
Externí odkaz:
http://arxiv.org/abs/2303.11400
Publikováno v:
Quantum 5, 485 (2021)
Geometric intuition is a crucial tool to obtain deeper insight into many concepts of physics. A paradigmatic example of its power is the Bloch ball, the geometrical representation for the state space of the simplest possible quantum system, a two-lev
Externí odkaz:
http://arxiv.org/abs/2012.00587
Autor:
Eltschka, Christopher, Siewert, Jens
Publikováno v:
Quantum 4, 229 (2020)
The existence of correlations between the parts of a quantum system on the one hand, and entanglement between them on the other, are different properties. Yet, one intuitively would identify strong $N$-party correlations with $N$-party entanglement i
Externí odkaz:
http://arxiv.org/abs/1908.04220
Autor:
Eltschka, Christopher, Siewert, Jens
Publikováno v:
Phys. Rev. A 101, 022302 (2020)
It is well known that the Schmidt decomposition exists for all pure states of a two-party quantum system. We demonstrate that there are two ways to obtain an analogous decomposition for arbitrary rank-1 operators acting on states of a bipartite finit
Externí odkaz:
http://arxiv.org/abs/1907.07976
Publikováno v:
Linear Algebra and its Applications Volume 584, 1 January 2020, Pages 294-325
We derive an inequality for the linear entropy, that gives sharp bounds for all finite dimensional systems. The derivation is based on generalised Bloch decompositions and provides a strict improvement for the possible distribution of purities for al
Externí odkaz:
http://arxiv.org/abs/1903.11887
Publikováno v:
Phys. Rev. A 98, 052317 (2018)
We present a family of correlations constraints that apply to all multipartite quantum systems of finite dimension. The size of this family is exponential in the number of subsystems. We obtain these relations by defining and investigating the genera
Externí odkaz:
http://arxiv.org/abs/1807.09165
Autor:
Eltschka, Christopher, Siewert, Jens
Publikováno v:
Quantum 2, 64 (2018)
The physics of a many-particle system is determined by the correlations in its quantum state. Therefore, analyzing these correlations is the foremost task of many-body physics. Any 'a priori' constraint for the properties of the global vs. the local
Externí odkaz:
http://arxiv.org/abs/1708.09639
Publikováno v:
J. Phys. A: Math. Theor. 51 175301 (2018)
A pure multipartite quantum state is called absolutely maximally entangled (AME), if all reductions obtained by tracing out at least half of its parties are maximally mixed. Maximal entanglement is then present across every bipartition. The existence
Externí odkaz:
http://arxiv.org/abs/1708.06298
Akademický článek
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Publikováno v:
Phys. Rev. A 94, 020302(R) (2016)
Among the many facets of quantum correlations, bound entanglement has remained one the most enigmatic phenomena, despite the fact that it was discovered in the early days of quantum information. Even its detection has proven to be difficult, let alon
Externí odkaz:
http://arxiv.org/abs/1609.01698