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Maximal entanglement versus entropy for mixed quantum states
Tzu-Chieh Wei, Kae Nemoto, Paul M. Goldbart +3
Maximally entangled mixed states are those states that, for a given mixedness, achieve the greatest possible entanglement. For two-qubit systems and for various combinations of ent…
Local permutations of products of Bell states and entanglement distillation
Jeroen Dehaene, Maarten Van den Nest, Bart De Moor +1
We present new algorithms for mixed-state multi-copy entanglement distillation for pairs of qubits. Our algorithms perform significantly better than the best known algorithms. Bett…
Asymptotic entanglement capacity of the Ising and anisotropic Heisenberg interactions
A. M. Childs, D. W. Leung, F. Verstraete +1
We compute the asymptotic entanglement capacity of the Ising interaction ZZ, the anisotropic Heisenberg interaction XX + YY, and more generally, any two-qubit Hamiltonian with cano…
Local vs. Joint Measurements for the Entanglement of Assistance
T. Laustsen, F. Verstraete, S. J. van Enk
We consider a variant of the entanglement of assistance, as independently introduced by D.P. DiVincenzo {\em et al.} ({\tt quant-ph/9803033}) and O. Cohen (Phys. Rev. Lett. {\bf 80…
On the fidelity of mixed states of two qubits
Frank Verstraete, Henri Verschelde
We consider a single copy of a mixed state of two qubits and show how its fidelity or maximal singlet fraction is related to the entanglement measures concurrence and negativity. W…
On quantum channels
Frank Verstraete, Henri Verschelde
One of the most challenging open problems in quantum information theory is to clarify and quantify how entanglement behaves when part of an entangled state is sent through a quantu…