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12 papers · 2 filters
Non-Markovian random unitary qubit dynamics
Dariusz Chruściński, Filip A. Wudarski
We compare two approaches to non-Markovian quantum evolution: one based on the concept of divisible maps and the other one based on distinguishability of quantum states. The former…
A posterior quantum dynamics for a continuous diffusion observation of a coherent channel
Anita Dabrowska, Przemysław Staszewski
We present the Belavkin filtering equation for the intense balanced heterodyne detection in a unitary model of an indirect observation. The measuring apparatus modelled by a Bose f…
Quantum key distribution with realistic heralded single photon sources
Mikolaj Lasota, Rafal Demkowicz-Dobrzanski, Konrad Banaszek
We analyze theoretically performance of four-state quantum key distribution protocols implemented with a realistic heralded single-photon source. The analysis assumes a noisy model…
Witnessing non-Markovianity of quantum evolution
Dariusz Chruściński, Andrzej Kossakowski
We provide further characterization of non-Markovian quantum dynamics based on the concept of divisible dynamical maps. In analogy to entanglement witness we propose a non-Markovia…
Quantum-correlation breaking channels, quantum conditional probability and Perron-Frobenius theory
Dariusz Chruściński
Using the quantum analog of conditional probability and classical Bayes theorem we discuss some aspects of quantum-classical and classical-classical channels in connection to the r…
Dissecting the qutrit
Gniewomir Sarbicki, Ingemar Bengtsson
To visualize a higher dimensional object it is convenient to consider its two-dimensional cross-sections. The set of quantum states for a three level system has eight dimensions. W…