504 citations · 652 across the 8 of their papers we have counts for
13 papers · 1 filter
Experimental Extraction of Secure Correlations from a Noisy Private State
Krzysztof Dobek, Michal Karpinski, Rafal Demkowicz-Dobrzanski +2
We report experimental generation of a noisy entangled four-photon state that exhibits a separation between the secure key contents and distillable entanglement, a hallmark feature…
Optimal Quantum Phase Estimation
U. Dorner, R. Demkowicz-Dobrzanski, B. J. Smith +4
By using a systematic optimization approach we determine quantum states of light with definite photon number leading to the best possible precision in optical two mode interferomet…
Optimal state for keeping reference frames aligned and the Platonic solids
Piotr Kolenderski, Rafal Demkowicz-Dobrzanski
The optimal N qubit states featuring highest sensitivity to small misalignment of cartesian reference frames are found using the Quantum Cramer-Rao bound. It is shown that the opti…
Entanglement Enhances Security in Secret Sharing
Rafal Demkowicz-Dobrzanski, Aditi Sen De, Ujjwal Sen +1
We analyze tolerable quantum bit error rates in secret sharing protocols, and show that using entangled encoding states is advantageous in the case when the eavesdropping attacks a…
Quantum state decorrelation
Giacomo M. D'Ariano, Rafal Demkowicz-Dobrzanski, Paolo Perinotti +1
We address the general problem of removing correlations from quantum states while preserving local quantum information as much as possible. We provide a complete solution in the ca…
Effects of imperfect noise correlations on decoherence-free subsystems: SU(2) diffusion model
Rafal Demkowicz-Dobrzanski, Piotr Kolenderski, Konrad Banaszek
We present a model of an N-qubit channel where consecutive qubits experience correlated random rotations. Our model is an extension to the standard decoherence-free subsystems appr…