Quantum information
R Horodecki - arxiv preprint arxiv:2103.07712, 2021 - arxiv.org
This article reviews the extraordinary features of quantum information predicted by the
quantum formalism, which, combined with the development of modern quantum …
quantum formalism, which, combined with the development of modern quantum …
[HTML][HTML] Analysing quantum systems with randomised measurements
Measurements with randomly chosen settings determine many important properties of
quantum states without the need for a shared reference frame or calibration. They naturally …
quantum states without the need for a shared reference frame or calibration. They naturally …
Multipartite entanglement analysis from random correlations
Quantum entanglement is usually revealed via a well aligned, carefully chosen set of
measurements. Yet, under a number of experimental conditions, for example in …
measurements. Yet, under a number of experimental conditions, for example in …
[HTML][HTML] Entanglement quantification from collective measurements processed by machine learning
J Roik, K Bartkiewicz, A Černoch, K Lemr - Physics Letters A, 2022 - Elsevier
This paper investigates how to reduce the number of measurement configurations needed
for sufficiently precise entanglement quantification. Instead of analytical formulae, we …
for sufficiently precise entanglement quantification. Instead of analytical formulae, we …
Quantum entanglement from random measurements
We show that the expectation value of squared correlations measured along random local
directions is an identifier of quantum entanglement in pure states, which can be directly …
directions is an identifier of quantum entanglement in pure states, which can be directly …
Accuracy of entanglement detection via artificial neural networks and human-designed entanglement witnesses
J Roik, K Bartkiewicz, A Černoch, K Lemr - Physical Review Applied, 2021 - APS
The detection of entangled states is essential in both fundamental and applied quantum
physics. However, this task proves to be challenging, especially for general quantum states …
physics. However, this task proves to be challenging, especially for general quantum states …
Method for universal detection of two-photon polarization entanglement
Detecting and quantifying quantum entanglement of a given unknown state poses problems
that are fundamentally important for quantum information processing. Surprisingly, no direct …
that are fundamentally important for quantum information processing. Surprisingly, no direct …
Quantifying entanglement of a two-qubit system via measurable and invariant moments of its partially transposed density matrix
We describe a direct method to determine the negativity of an arbitrary two-qubit state in
experiments. The method is derived by analyzing the relation between the purity, negativity …
experiments. The method is derived by analyzing the relation between the purity, negativity …
Detecting genuine multipartite entanglement of pure states with bipartite correlations
Detecting genuine multipartite entanglement of pure states with bipartite correlations Page 1
PHYSICAL REVIEW A 87, 034301 (2013) Detecting genuine multipartite entanglement of pure …
PHYSICAL REVIEW A 87, 034301 (2013) Detecting genuine multipartite entanglement of pure …
Experimental measurement of collective nonlinear entanglement witness for two qubits
K Lemr, K Bartkiewicz, A Černoch - Physical Review A, 2016 - APS
We present a proof-of-principle experiment demonstrating measurement of the collectibility,
a nonlinear entanglement witness proposed by Ł. Rudnicki et al.[Phys. Rev. Lett. 107 …
a nonlinear entanglement witness proposed by Ł. Rudnicki et al.[Phys. Rev. Lett. 107 …