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024			_a10.1088/0953-4075/48/18/185502.
040			_aSNU Library
041			_aEnglish
100			_aChatterjee, A.
100			_aDhar,H. S.
100			_aGhosh,R.
245			_aGenerating Continuous Variable Entangled States for Quantum Teleportation Using a Superposition of Number-Conserving Operations
300			_a2015, VOL. 48 (18), pp. 1-17.
440			_aJournal of Physics B: Atomic, Molecular and Optical Physics,�
500			_aOpen Source
520			_aWe investigate the states generated in continuous variable (CV) optical fields on operating them with a number-conserving operator of the type _s\hat{a}\hat{a}^\dag + t\hat{a}^\dag\hat{a} _, formed by the generalised superposition of products of field annihilation (a^) and creation ( _\hat{a}^\dag _) operators, with s2+t2=1. Such an operator is experimentally realizable and can be suitably manipulated to generate nonclassical optical states when applied on single- and two-mode coherent, thermal, and squeezed input states. At low intensities, these nonclassical states can interact with a secondary mode via a linear optical device to generate two-mode discrete entangled states, which can serve as a resource in quantum information protocols. The advantage of these operations are tested by applying the generated entangled states as quantum channels in CV quantum teleportation, under the Braunstein and Kimble protocol. We observe that, under these operations, while the average fidelity of CV teleportation is enhanced for the nonclassical channel formed using input squeezed states, it remains at the classical threshold for input coherent and thermal states. This is due to the fact that though these operations can introduce discrete entanglement in all input states, it enhances the Einstein-Podolosky-Rosen (EPR) correlations only in the nonclassical squeezed state inputs, leading to an advantage in CV teleportation. This shows that nonclassical optical states generated using the above operations on classical coherent and thermal state inputs are not resourceful for CV teleportation. This investigation could prove useful in efficient implementation of noisy non-Gaussian channels, formed by linear operations, in future teleportation protocols.
530			_uhttp://arxiv.org/abs/1312.6226
546			_aText in English
650			_a;Entanglement
650			_a;EPR Correlation
650			_a;Non-Gaussian Operation
650			_a;Quantum Teleportation
650			_aContinuous Variable System
700			_aGhosh,R.
773			_tJournal of Physics B: Atomic, Molecular and Optical Physics,�
856			_uhttp://arxiv.org/abs/1312.6226
942			_cFaculty Publication
999			_c45323 _d45323