This paper reviews quantum spin squeezing, which characterizes the sensitivity of a state
with respect to SU (2) rotations, and is significant for both entanglement detection and high …

Recent interest in aspects common to quantum information and condensed matter has
prompted a flurry of activity at the border of these disciplines that were far distant until a few …

Full article: Matrix product states, projected entangled pair states, and variational
renormalization group methods for quantum spin systems Skip to Main Content Taylor and …

Graph states are multiparticle entangled states that correspond to mathematical graphs,
where the vertices of the graph take the role of quantum spin systems and edges represent …

The degree to which a pure quantum state is entangled can be characterized by the
distance or angle to the nearest unentangled state. This geometric measure of …

Quantum technologies exploit entanglement to enhance various tasks beyond their classical
limits including computation, communication and measurements. Quantum metrology aims …

We report the first experimental generation and characterization of a six-photon Dicke state.
The produced state shows a fidelity of F= 0.56±0.02 with respect to an ideal Dicke state and …

We consider a system of mutually interacting spins 1/2 embedded in a transverse magnetic
field which undergoes a second-order quantum phase transition. We analyze the …

We show that spin squeezing implies pairwise entanglement for arbitrary symmetric
multiqubit states. If the squeezing parameter is less than or equal to 1, we demonstrate a …

Feedback control of quantum mechanical systems must take into account the probabilistic
nature of quantum measurement. We formulate quantum feedback control as a problem of …