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Telecloning and multiuser quantum channels for continuous variables
P. van Loock, Samuel L. Braunstein
We propose entangled (M+1)-mode quantum states as a multiuser quantum channel for continuous-variable communication. Arbitrary quantum states can be sent via this channel simultane…
Quantum versus Classical Domains for Teleportation with Continuous Variables
Samuel L. Braunstein, Christopher A. Fuchs, H. J. Kimble +1
Fidelity F{classical} = 1/2 has been established as setting the boundary between classical and quantum domains in the teleportation of coherent states of the electromagnetic field…
Optimal cloning of coherent states with a linear amplifier and beam splitters
Samuel L. Braunstein, Nicolas J. Cerf, Sofyan Iblisdir +2
A transformation achieving the optimal symmetric N-to-M cloning of coherent states is presented. Its implementation only requires a phase-insensitive linear amplifier and a network…
Multi-Dimensional Hermite Polynomials in Quantum Optics
Pieter Kok, Samuel L Braunstein
We study a class of optical circuits with vacuum input states consisting of Gaussian sources without coherent displacements such as down-converters and squeezers, together with det…
Quantum interferometric optical lithography:towards arbitrary two-dimensional patterns
Pieter Kok, Agedi N. Boto, Daniel S. Abrams +3
As demonstrated by Boto et al. [Phys. Rev. Lett. 85, 2733 (2000)], quantum lithography offers an increase in resolution below the diffraction limit. Here, we generalize this proced…
Quantum information distributors: Quantum network for symmetric and asymmetric cloning in arbitrary dimension and continuous limit
Samuel L. Braunstein, Vladimir Buzek, Mark Hillery
We show that for any Hilbert-space dimension, the optimal universal quantum cloner can be constructed from essentially the same quantum circuit, i.e., we find a universal design fo…