544 citations · 879 across the 20 of their papers we have counts for
20 papers
Optimal estimation of parameters encoded in coherent states quadratures
M. Arnhem, E. Karpov, N. J. Cerf
In the context of multiparameter quantum estimation theory, we investigate the construction of linear schemes in order to infer two classical parameters that are encoded in the qua…
Classical capacity of phase-sensitive Gaussian quantum channels
Joachim Schäfer, Evgueni Karpov, Oleg V. Pilyavets +1
The full solution of the optimization problem giving the Gaussian capacity of the single-mode fiducial Gaussian quantum channel is provided. Since it was shown that the Gaussian ca…
Detection of non-Gaussian entangled states with an improved continuous-variable separability criterion
Anaelle Hertz, Evgueni Karpov, Aikaterini Mandilara +1
Currently available separability criteria for continuous-variable states are generally based on the covariance matrix of quadrature operators. The well-known separability criterion…
Equivalence Relations for the Classical Capacity of Single-Mode Gaussian Quantum channels
Joachim Schäfer, Evgueni Karpov, Raúl García-Patrón +2
We prove the equivalence of an arbitrary single-mode Gaussian quantum channel and a newly defined fiducial channel preceded by a phase shift and followed by a Gaussian unitary oper…
A probabilistic phase-insensitive optical squeezer in peaceful coexistence with causality
C. N. Gagatsos, E. Karpov, N. J. Cerf
A non trace-preserving map describing a probabilistic but heralded noiseless linear amplifier has recently been proposed and experimentally demonstrated. Here, we exhibit another r…
Gaussian matrix-product states for coding in bosonic communication channels
Joachim Schäfer, Evgueni Karpov, Nicolas J. Cerf
The communication capacity of Gaussian bosonic channels with memory has recently attracted much interest. Here, we investigate a method to prepare the multimode entangled input sym…