Control and measurement of quantum light pulses for quantum information science and technology

M Karpiński, AOC Davis, F Sośnicki… - Advanced Quantum …, 2021 - Wiley Online Library
Manipulation of quantum optical pulses, such as single photons or entangled photon pairs,
enables numerous applications, from quantum communications and networking to …

Efficiency of photonic state tomography affected by fiber attenuation

A Czerwinski, J Szlachetka - Physical Review A, 2022 - APS
In this article, we investigate the efficiency of photonic state tomography in the presence of
fiber attenuation. The theoretical formalism of the photon loss is provided by implementing …

Efficient detection of multidimensional single-photon time-bin superpositions

A Widomski, M Ogrodnik, M Karpiński - Optica, 2024 - opg.optica.org
The ability to detect quantum superpositions lies at the heart of fundamental and applied
aspects of quantum mechanics. The time-frequency degree of freedom of light enables …

Fully controllable time-bin entangled states distributed over 100-km single-mode fibers

J Kim, J Park, HS Kim, G Kim, JT Kim, J Park… - EPJ Quantum …, 2024 - epjqt.epj.org
Quantum networks that can perform user-defined protocols beyond quantum key distribution
will require fully controllable entangled quantum states. To expand the available space of …

Quantum state tomography with informationally complete POVMs generated in the time domain

A Czerwinski - Quantum Information Processing, 2021 - Springer
The article establishes a framework for dynamic generation of informationally complete
POVMs in quantum state tomography. Assuming that the evolution of a quantum system is …

Hamiltonian tomography by the quantum quench protocol with random noise

A Czerwinski - Physical Review A, 2021 - APS
In this article, we introduce a framework for Hamiltonian tomography of multiqubit systems
with random noise. We adopt the quantum quench protocol to reconstruct a many-body …

Quantum state tomography in nonequilibrium environments

H Chen, T Han, M Chen, J Ren, X Cai, X Meng, Y Peng - Photonics, 2023 - mdpi.com
We generalize an approach to studying the quantum state tomography (QST) of open
systems in terms of the dynamical map in Kraus representation within the framework of …

Quantum tomography of entangled qubits by time-resolved single-photon counting with time-continuous measurements

A Czerwinski - Quantum Information Processing, 2022 - Springer
In this article, we introduce a framework for entanglement characterization by time-resolved
single-photon counting with measurement operators defined in the time domain. For a …

Phase estimation of time-bin qudits by time-resolved single-photon counting

A Czerwinski, K Sedziak-Kacprowicz, P Kolenderski - Physical Review A, 2021 - APS
We present a comprehensive framework for quantum state tomography of time-bin qudits
sent through a fiber. Starting from basic assumptions, we define a positive-operator valued …

Quantum tomography of pure states with projective measurements distorted by experimental noise

A Czerwinski - arXiv preprint arXiv:2012.13402, 2020 - arxiv.org
The article undertakes the problem of pure state estimation from projective measurements
based on photon counting. Two generic frames for qubit tomography are considered--one …