Bell's 1964 theorem, which states that the predictions of quantum theory cannot be
accounted for by any local theory, represents one of the most profound developments in the …

How can one prove that a given quantum state is entangled? In this paper we review
different methods that have been proposed for entanglement detection. We first explain the …

Over the past few decades, significant progress has been made in quantum information
technology, from theoretical studies to experimental demonstrations. Revolutionary quantum …

We summarize important recent advances in quantum metrology, in connection to
experiments in cold gases, trapped cold atoms and photons. First we review simple …

Optical whispering gallery modes (WGMs) derive their name from a famous acoustic
phenomenon of guiding a wave by a curved boundary observed nearly a century ago. This …

We present the experimental detection of genuine multipartite entanglement using
entanglement witness operators. To this aim, we introduce a canonical way of constructing …

We develop an original approach for the quantitative characterisation of the entanglement
properties of, possibly mixed, bi-and multipartite quantum states of arbitrary finite dimension …

We report the deterministic creation of maximally entangled three-qubit states—specifically
the Greenberger-Horne-Zeilinger (GHZ) state and the W state—with a trapped-ion quantum …

We present a review of theoretical and experimental aspects of multiphoton quantum optics.
Multiphoton processes occur and are important for many aspects of matter–radiation …

We report on the experimental observation and characterization of a six-photon entangled
Dicke state. We obtain a fidelity as high as 0.654±0.024 and prove genuine six-photon …