Deterministic transformations of bipartite pure states

Measuring the entanglement of bipartite pure states

The problem of the experimental determination of the amount of entanglement of a bipartite pure state is addressed. We show that measuring a single observable does not suffice to determine the entanglement of a given unknown pure state of two particles. Possible minimal local measuring strategies are discussed and a comparison is made on the basis of their best achievable precision. PACS-number...

Entanglement splitting of pure bipartite quantum states

where % i is a density matrix for the nth subsystem, and the positive weights pi obey ∑ i pi = 1. Otherwise the system is called entangled – a property that exists only for quantum states. Several features of entanglement have been studied so far, e.g. how to concentrate entanglement of several pairs into more entangled fewer pairs (distillation or purification [1,2]) or how to transfer entangl...

Purity distribution for bipartite random pure states

Approximate transformations and robust manipulation of bipartite pure state entanglement

We analyze approximate transformations of pure entangled quantum states by local operations and classical communication, finding explicit conversion strategies which optimize the fidelity of transformation. These results allow us to determine the most faithful teleportation strategy via an initially shared partially entangled pure state. They also show that procedures for entanglement manipulat...

Entanglement transformations of pure Gaussian states

G. Giedke, J. Eisert, J.I. Cirac, and M.B. Plenio 1 4. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany 2 Max-Planck–Institut für Quantenoptik, Hans-Kopfermann-Straße, D-85748 Garching, Germany 3 Institut für Physik, Universität Potsdam, Am Neuen Palais 10, D-14469 Potsdam, Germany 4 QOLS, Blackett Laboratory, Imperial College London, SW7 2BZ London...