Stéphanie Krins

Operational Families of Entanglement Classes for Symmetric N-Qubit States

We solve the entanglement classification under stochastic local operations and classical communication (SLOCC) for all multipartite symmetric states in the general N-qubit case. For this purpose, we introduce 2 parameters playing a crucial role, namely, the diversity degree and the degeneracy configuration of a symmetric state. Those parameters give rise to a simple method of identifying operational families of SLOCC entanglement classes of all symmetric N-qubit states, where the number of families grows as the partition function of the number of qubits.

Entanglement equivalence of N-qubit symmetric states

We study the interconversion of multipartite symmetric N-qubit states under stochastic local operations and classical communication (SLOCC). We demonstrate that if two symmetric states can be connected with a nonsymmetric invertible local operation (ILO), then they belong necessarily to the separable, W, or Greenberger-Horne-Zeilinger (GHZ) entanglement class, establishing a practical method of discriminating subsets of entanglement classes. Furthermore, we prove that there always exists a symmetric ILO connecting any pair of symmetric N-qubit states equivalent under SLOCC, simplifying the requirements for experimental implementations of local interconversion of those states.

Operational multipartite entanglement classes for symmetric photonic qubit states

We present experimental schemes that allow us to study the entanglement classes of all symmetric states in multiqubit photonic systems. We compare the efficiency of the proposed schemes and highlight the relation between the entanglement properties of symmetric Dicke states and a recently proposed entanglement scheme for atoms. In analogy to the latter, we obtain a one-to-one correspondence between well-defined sets of experimental parameters and multiqubit entanglement classes inside the symmetric subspace of the photonic system.

Isotope shifts and hyperfine structure of the Fe I 372-nm resonance line

We report measurements of the isotope shifts of the

Hyperfine-structure splitting of the 716 nm R(90)3–10 molecular iodine transition

3{d}^{6}4{s}^{2}

First experimental realization of an Iron Magneto-Optical Trap

a\text{ }{^{5}D}_{4}\ensuremath{-}3{d}^{6}4s4p

Towards magneto-optical trapping of iron atoms

z\text{ }{^{5}F}_{5}^{o}