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- Alexander Streltsov, Hermann Kampermann, Dagmar Bruss
- Physical review letters
- 2011

We show that a von Neumann measurement on a part of a composite quantum system unavoidably creates distillable entanglement between the measurement apparatus and the system if the state has nonzero quantum discord. The minimal distillable entanglement is equal to the one-way information deficit. The quantum discord is shown to be equal to the minimal… (More)

- Alexander Streltsov, Hermann Kampermann, Dagmar Bruss
- Physical review letters
- 2011

We characterize the behavior of quantum correlations under the influence of local noisy channels. Intuition suggests that such noise should be detrimental for quantumness. When considering qubit systems, we show for which channels this is indeed the case: The amount of quantum correlations can only decrease under the action of unital channels. However,… (More)

- Hermann Kampermann, W. S. Veeman
- Quantum Information Processing
- 2002

- Alexander Streltsov, Hermann Kampermann, Dagmar Bruß
- Physical review letters
- 2012

Establishing quantum entanglement between two distant parties is an essential step of many protocols in quantum information processing. One possibility for providing long-distance entanglement is to create an entangled composite state within a lab and then physically send one subsystem to a distant lab. However, is this the "cheapest" way? Here, we… (More)

- Philipp Krammer, Hermann Kampermann, Dagmar Bruss, Reinhold A Bertlmann, Leong Chuang Kwek, Chiara Macchiavello
- Physical review letters
- 2009

We establish a relation between entanglement of a many-body system and its diffractive properties, where the link is given by structure factors. Based on these, we provide a general analytical construction of multiqubit entanglement witnesses. The proposed witnesses contain two-point correlations. They could be either measured in a scattering experiment or… (More)

- Masahito Hayashi, Yinxiang Long, +5 authors Dagmar Bruß
- 2010

An important problem in quantum information theory is the quantification of entanglement in multipartite mixed quantum states. In this work, a connection between the geometric measure of entanglement and a distance measure of entanglement is established. We present a new expression for the geometric measure of entanglement in terms of the maximal fidelity… (More)

- Sevag Gharibian, Hermann Kampermann, Dagmar Bruß
- Quantum Information & Computation
- 2011

Given a bipartite quantum state ρ with subsystems A and B of arbitrary dimensions, we study the entanglement detecting capabilities of locally noneffective, or cyclic, unitary operations [L. B. Fu, Europhys. Lett., vol. 75, pp. 1–7, 2006]. Local cyclic unitaries have the special property that they leave their target subsystem invariant. We investigate the… (More)

- Michael Epping, Hermann Kampermann, Dagmar Bruß
- Physical review letters
- 2013

We present a simple analytic bound on the quantum value of general correlation type Bell inequalities, similar to Tsirelson's bound. It is based on the maximal singular value of the coefficient matrix associated with the inequality. We provide a criterion for tightness of the bound and show that the class of inequalities where our bound is tight covers many… (More)

- Jochen Szangolies, Hermann Kampermann, Dagmar Bruß
- Physical review letters
- 2017

In many quantum information applications, a minimum detection efficiency must be exceeded to ensure success. Protocols depending on the violation of a Bell inequality, for instance, may be subject to the so-called detection loophole: Imperfect detectors may yield spurious violations, which consequently cannot be used to ensure, say, quantum cryptographic… (More)

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