6 papers · 1 filter
Two theorems of Jhon Bell and Communication Complexity
Guruprasad Kar
John Bell taught us that quantum mechanics can not be reproduced by non-contextual and local Hidden variable theory. The impossibility of replacing quantum mechanics by non-context…
Probabilistic cloning and signalling
Sibasish Ghosh, Guruprasad Kar, Samir Kunkri +1
We give a proof of impossibility of probabilistic exact cloning of any three different states of a qubit. The simplicity of the proof is due to the use of a surprising res…
Entanglement vs. Noncommutativity in Teleportation
Sibasish Ghosh, Guruprasad Kar, Anirban Roy +1
We provide an alternative simple proof of the necessity of entanglement in quantum teleportation by using the no-disentanglement theorem. We show that this is true even when the st…
Classification of Maximally Entangled States of Spin-1/2 Particles
S. Ghosh, G. Kar, A. Roy
This paper has been withdrawn temporarily.
Noncomplemetary Wave-Particle Phenomena Revisited
G. Kar, A. Roy, S. Ghosh +1
The simultaneous verification of wave and particle property in some recently suggested experiments has been reviewed in the light of Hilbert space formalism. In this respect, the r…
Is an optimal quantum cloner the best choice for local copying in broadcasting entanglement?
Somshubhro Bandyopadhyay, Guruprasad Kar
The paper is temporarily withdrawn by the authors.