Most of the attention given to continuous variable systems for quantum information processing has traditionally been focused on Gaussian states. However, non-Gaussianity is an essential requirement for universal quantum computation and entanglement distillation, and can improve the efficiency of other quantum information tasks. Here we report the experimental observation of genuine non-Gaussian...

We report on a geometric formulation of multipartite entanglement measures which sets a generalization of the partial formulation of a few-qubit entanglement scenario reported in Ref. [1]. By means of the permutation group of N = 3 elements, we first propose a measure which satisfactorily reproduces the entanglement values reported in the literature for tripartite entangled states. We then give...

The generation and quantification of quantum entanglement is crucial for quantum information processing. Here we study the transition of Gaussian correlation under the effect of linear optical beam-splitters. We find the single-mode Gaussian coherence acts as the resource in generating Gaussian entanglement for two squeezed states as the input states. With the help of consecutive beam-splitters...

OBJECTIVE To review the current literature concerning perinatal outcome of monoamniotic pregnancies with cord entanglement. METHODS A search in PubMed, EMBASE and MEDLINE for articles published between January 2000 and December 2011 was performed, using the following keywords: monoamniotic/monochorionic pregnancy(ies); twins; cord entanglement; fetal ultrasound/surveillance. Inclusion criteri...

Nielsen’s theorem indicates that a bipartite entangled pure state can be exactly converted into another pure one by local quantum operations and classical communication if and only if the Schmidt coefficient vector of the former is majorized by that of the latter [Phys. Rev. Lett. 83, 436 (1999)]. As a consequence of Nielsen’s majorization criterion, the quantity of entanglement is decreased du...

Entanglement has played a key role in many quantum information processing, such as quantum computation [1], quantum teleportation [2], quantum dense coding [3], and entanglement-assisted quantum cryptography [4]. To function optimally these applications requires maximally entanglement. However, unwanted coupling to the environment causes the degradation of entanglement and entanglement concentr...

We develop protocols for preparing a GHZ state and, in general, a pure multi-partite maximally entangled state in a distributed network with apriori quantum entanglement between agents using classical communication and local operations. We investigate and characterize the minimal combinatorics of the sharing of EPR pairs required amongst agents in a network for the creation of multi-partite ent...

Quantum mechanics has many counter-intuitive consequences which contradict our intuition which is based on classical physics. Here we discuss a special aspect of quantum mechanics, namely the possibility of entanglement between two or more particles. We will establish the basic properties of entanglement using quantum state teleportation. These principles will then allow us to formulate quantit...

Entanglement appears under two different forms in quantum theory, namely, as a property of states of joint systems and as a property of measurement eigenstates in joint measurements. By combining these two aspects of entanglement, it is possible to generate nonlocality between particles that never interacted, using the protocol of entanglement swapping. We show that even in the more constrainin...

We consider the actions of protocols involving local quantum operations and classical communication (LQCC) on a single system consisting of two separated qubits. We give a complete description of the orbits of the space of states under LQCC and characterise the representatives with maximal entanglement of formation. We thus obtain a LQCC entanglement concentration protocol for a single given st...