504 citations · 7.2k across the 114 of their papers we have counts for
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Measuring Quantum State in Phase Space
Konrad Banaszek
In this thesis we present a direct scheme for measuring quasidistribution functions of light. This scheme, based on photon counting, is derived from a simple relation linking the W…
Maximum-likelihood estimation of the density matrix
K. Banaszek, G. M. D'Ariano, M. G. A. Paris +1
We present a universal technique for quantum state estimation based on the maximum-likelihood method. This approach provides a positive definite estimate for the density matrix fro…
Determination of the Wigner function from photon statistics
K. Banaszek, C. Radzewicz, K. Wodkiewicz +1
We present an experimental realisation of the direct scheme for measuring the Wigner function of a single quantized light mode. In this method, the Wigner function is determined as…
Nonlocality of the Einstein-Podolsky-Rosen state in the phase space
Konrad Banaszek, Krzysztof Wodkiewicz
We discuss violation of Bell inequalities by the regularized Einstein-Podolsky-Rosen (EPR) state, which can be produced in a quantum optical parametric down-conversion process. We…
Maximum-likelihood algorithm for quantum tomography
Konrad Banaszek
Optical homodyne tomography is discussed in the context of classical image processing. Analogies between these two fields are traced and used to formulate an iterative numerical al…
Direct measurement of the Wigner function by photon counting
K. Banaszek, C. Radzewicz, K. Wodkiewicz +1
We report a direct measurement of the Wigner function characterizing the quantum state of a light mode. The experimental scheme is based on the representation of the Wigner functio…
Optimal receiver for quantum cryptography with two coherent states
Konrad Banaszek
A setup for discriminating between arbitrary two coherent states of a single light mode with the highest success rate allowed by quantum mechanics is presented. Its application to…
Quantum homodyne tomography with a priori constraints
Konrad Banaszek
I present a novel algorithm for reconstructing the Wigner function from homodyne statistics. The proposed method, based on maximum-likelihood estimation, is capable of compensating…