We choose the squeezed vacuum state as a one-parameter trial wavefunction, to minimize the energy of an anharmonic oscillator, with a polynomial perturbation potential. Using the optimal vacuum stateâ€¦ (More)

Using concurrence as a measure of entanglement, we present analytical and numerical study of entanglement dynamics in a two-qutrit system in the presence of the Dzyaloshinskiiâ€“Moriya interaction, asâ€¦ (More)

Dynamics of localizable entanglement in a qutrit chain, in the presence of the Dzyaloshinskiiâ€“Moriya (DM) interaction is studied. Three distinct initial states, namely, superposition of the groundâ€¦ (More)

A new strong lower bound on concurrence for two-qubit states is derived. Its equality with the concurrence itself for the pureand X-states is proved analytically; while extensive numericalâ€¦ (More)

We study entanglement and squeezing properties of a spin system of 4 qubits under the influence of the two-axis counter twisting Hamiltonian. Our initial spin state is a coherent one in theâ€¦ (More)

An entanglementâ€“purification protocol is introduced using three Werner states with application of local operations, including multiple CNOT gates, and classical communications. We achieve someâ€¦ (More)