arXiv subjects

Hari Prakash

Publications and source records attributed to Hari Prakash.

21 records · Page 2Linked to original sources

arXiv2011

Two-Way Quantum Communication: `Secure Quantum Information Exchange'-II. Generalization to Arbitrary Number of Qubits

In this paper, we generalize the secure quantum information exchange (SQIE) protocol, originally proposed by the authors [J. Phys. B: At. Mol. Opt. Phys. 44 (2011) 115504] for secure exchange of one qubit information with each of Alice and Bob, to the case of secure exchange of quantum information of arbitrary qubits with Alice and Bob. We also discuss security of the original and generalized SQIE protocols with respect to the number of qubits with controller, Charlie.

quant-ph↗

arXiv2011

Increasing Average Fidelity by Using Non-Maximally Entangled Resource in Teleportation of Superposed Coherent States

We consider the problem of teleporting superposed coherent state using non-maximally entangled coherent state as quantum channel and study the effect of entanglement over quality of teleportation. We show that if maximally entangled coherent state (MECS) used by Van Enk and Hirota [Phys. Rev. A 64, 022313 (2001)] and by H Prakash et al. [Phys. Rev. A 75, 044305 (2007)] is replaced by a particular non-maximally entangled coherent state (NMECS), average fidelity of quantum teleportation increases appreciably at small coherent amplitudes. Since it is very challenging to produce superposed coherent states of large coherent amplitudes, the particular NMECS appear to be a good quantum channel for teleportation at small coherent amplitudes for practical implementation.

quant-ph↗

arXiv2011

Higher-order optical-polarization

Polarization properties of optical field in Schrödinger Cat states or Even- or Odd-Coherent states are investigated by generalizing usual concept of optical-polarization to render the concept of Higher-order optical-polarization. It is observed that Higher-order optical-polarization is a basis-dependent property of optical field.

physics.optics↗