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Quantum communication with macroscopically bright nonclassical states
Vladyslav C. Usenko, Laszlo Ruppert, Radim Filip
We analyze homodyne detection of macroscopically bright multimode nonclassical states of light and propose their application in quantum communication. We observe that the homodyne…
Heralded Source of Bright Multi-mode Mesoscopic Sub-Poissonian Light
Timur Sh. Iskhakov, Vladyslav C. Usenko, Ulrik L. Andersen +3
In a direct detection scheme we observed 7.8 dB of twin-beam squeezing for multi-mode two-color squeezed vacuum generated via parametric down conversion. Applying post-selection, w…
Estimation of covariance matrix of macroscopic quantum states
László Ruppert, Vladyslav C. Usenko, Radim Filip
For systems analogous to a linear harmonic oscillator, the simplest way to characterize the state is by a covariance matrix containing the symmetrically-ordered moments of operator…
Unidimensional continuous-variable quantum key distribution
Vladyslav C. Usenko, Frédéric Grosshans
We propose the continuous-variable quantum key distribution protocol based on the Gaussian modulation of a single quadrature of the coherent states of light, which is aimed to prov…