71 citations · 598 across the 27 of their papers we have counts for
4 papers · 1 filter
Collective multipole-like signatures of entanglement in symmetric N-qubit systems
A. R. Usha Devi, R. Prabhu, A. K. Rajagopal
A cogent theory of collective multipole-like quantum correlations in symmetric multiqubit states is presented by employing SO(3) irreducible spherical tensor representation. An arb…
Characterizing multiparticle entanglement in symmetric N-qubit states via negativity of covariance matrices
A. R. Usha Devi, R. Prabhu, A. K. Rajagopal
We show that higher order inter-group covariances involving even number of qubits are necessarily positive semidefinite for N qubit separable states, which are completely symmetric…
Non-classicality of photon added coherent and thermal radiations
A. R. Usha Devi, R. Prabhu, M. S. Uma
Production and analysis of non-Gaussian radiation fields has evinced a lot of attention recently. Simplest way of generating such non-Gaussians is through adding (subtracting) phot…
Constraints on the uncertainties of entangled symmetric qubits
A. R. Usha Devi, M. S. Uma, R. Prabhu +1
We derive necessary and sufficient inseparability conditions imposed on the variance matrix of symmetric qubits. These constraints are identified by examining a structural parallel…