Entanglement of truncated quantum states

GEOMETRY OF QUANTUM STATES An Introduction to Quantum Entanglement GEOMETRY OF QUANTUM STATES An Introduction to Quantum Entanglement

Entanglement of formation of bipartite quantum states.

We give an explicit tight lower bound for the entanglement of formation for arbitrary bipartite mixed states by using the convex hull construction of a certain function. This is achieved by revealing a novel connection among the entanglement of formation, the well-known Peres-Horodecki, and realignment criteria. The bound gives a quite simple and efficiently computable way to evaluate quantitat...

An Entanglement Study of Superposition of Qutrit Spin-Coherent States

Considering generalized concurrence as the criterion of entanglement, we study entanglement properties of superposition of two qutrit coherent states, as a function of their amplitudes. These states may attain maximum entanglement or no entanglement at all, depending on the choice of the parameters involved. The states revealing maximum entanglement also display the maximum violations of the Be...

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...

Entanglement and control of quantum states

In the first part of this thesis, we examine the preparation of a singlemode radiation field in arbitrary pure quantum states via resonant interaction with a sequence of two-level atoms. The preparation is achieved by choosing an appropriate (in general entangled) initial state of the atomic sequence, and does neither require a final state measurement of the atoms, nor a control of the atom-fie...