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Optical implementation of continuous-variable quantum cloning machines
Jaromir Fiurasek
We propose an optical implementation of the Gaussian continuous-variable quantum cloning machines. We construct a symmetric N -> M cloner which optimally clones coherent states and…
Measurement of quantum devices
Jaromir Fiurasek, Zdenek Hradil
Maximum-likelihood estimation is applied to identification of an unknown quantum mechanical process represented by a ``black box''. In contrast to linear reconstruction schemes the…
Sampling functions for multimode homodyne tomography with a single local oscillator
Jaromir Fiurasek
We derive various sampling functions for multimode homodyne tomography with a single local oscillator. These functions allow us to sample multimode s-parametrized quasidistribution…
Direct sampling of exponential phase moments of smoothed Wigner functions
Jaromir Fiurasek
We investigate exponential phase moments of the s-parametrized quasidistributions (smoothed Wigner functions). We show that the knowledge of these moments as functions of s provide…