Sibasish Ghosh

Distinguishability of Bell states.

More than two multipartite orthogonal states cannot always be discriminated if only local operations and classical communication (LOCC) are allowed. We show that four Bell states cannot be discriminated by LOCC, even probabilistically, using the separability properties of a four-party unlockable bound entangled state. Using an existing inequality among the measures of entanglement, we show that any three Bell states cannot be discriminated with certainty by LOCC. Exploiting the inequality, we calculate the distillable entanglement of a certain class of 4 multiply sign in circle 4 mixed states.

Optimal cloning and no signaling

Abstract It is shown that the no signaling constraint generates the whole class of 1 → 2 optimal quantum cloning machines of single qubits

Antiparallel spin does not always contain more information

We show that the Bloch vectors lying on any great circle comprise the largest set

Hardy's nonlocality for entangled states of three spin-12 particles

{S}_{L}

Entanglement teleportation via Bell mixtures

for which the parallel states

Optimal universal disentangling machine for two-qubit quantum states

|\stackrel{\ensuremath{\rightarrow}}{n},\stackrel{\ensuremath{\rightarrow}}{n}〉

Hardy's nonlocality for two spin-s particles

can always be exactly transformed into the antiparallel states

Realization of optimal disentanglement by teleportation via separable channels

|\stackrel{\ensuremath{\rightarrow}}{n},\ensuremath{-}\stackrel{\ensuremath{\rightarrow}}{n}〉.

REALIZATIONS OF UQ(SU(1,1)) BY DEFORMED QUANTUM HARMONIC OSCILLATOR ALGEBRAS AND ASSOCIATED DEFORMED HEISENBERG ALGEBRAS

Thus more information about

Mixedness in the Bell violation versus entanglement of formation

\stackrel{\ensuremath{\rightarrow}}{n}