Marcin Karczewski
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View article: Quantum Synchronizing Words
Quantum Synchronizing Words Open
Synchronizing words in classical automata theory provide a mechanism to reset any state of a deterministic automaton to a specific target state via a carefully chosen finite sequence of transition rules. In this work, we extend the concept…
View article: Rabi transport and the other finite-size effects in one-dimensional discrete-time topological quantum walk
Rabi transport and the other finite-size effects in one-dimensional discrete-time topological quantum walk Open
This paper investigates Rabi transport and finite-size effects in one-dimensional discrete-time topological quantum walks. We demonstrate the emergence of localized states at boundaries between topologically distinct phases and analyze how…
View article: Quantum Synchronizing Words: Resetting and Preparing Qutrit States
Quantum Synchronizing Words: Resetting and Preparing Qutrit States Open
Synchronizing words in classical automata theory provide a mechanism to reset any state of a deterministic automaton to a specific target state via a carefully chosen finite sequence of transition rules. In this work, we extend the concept…
View article: Indistinguishability in general probabilistic theories
Indistinguishability in general probabilistic theories Open
The existence of indistinguishable quantum particles provides an explanation for various physical phenomena we observe in nature. We lay out a path for the study of indistinguishable particles in general probabilistic theories (GPTs) via t…
View article: Heralded Optical Entanglement Generation via the Graph Picture of Linear Quantum Networks
Heralded Optical Entanglement Generation via the Graph Picture of Linear Quantum Networks Open
Non-destructive heralded entanglement with photons is a valuable resource for quantum information processing. However, they generally entail ancillary particles and modes that amplify the circuit intricacy. To address this challenge, a rec…
View article: Robust generation of N-partite N-level singlet states by identical particle interferometry
Robust generation of N-partite N-level singlet states by identical particle interferometry Open
We propose an interferometric scheme for generating the totally antisymmetric state of N identical bosons with N internal levels (generalized singlet). This state is a resource for various problems with dramatic quantum advantage. The proc…
View article: Shortcut to multipartite entanglement generation: A graph approach to boson subtractions
Shortcut to multipartite entanglement generation: A graph approach to boson subtractions Open
We propose a graph method for systematically searching for schemes that can generate multipartite entanglement in linear bosonic systems with heralding. While heralded entanglement generation offers more tolerable schemes for quantum tasks…
View article: Robust generation of $N$-partite $N$-level singlet states by identical particle interferometry
Robust generation of $N$-partite $N$-level singlet states by identical particle interferometry Open
We propose an interferometric scheme for generating the totally antisymmetric state of $N$ identical bosons with $N$ internal levels (generalized singlet). This state is a resource for various problems with dramatic quantum advantage. The …
View article: Heralded Optical Entanglement Generation via the Graph Picture of Linear Quantum Networks
Heralded Optical Entanglement Generation via the Graph Picture of Linear Quantum Networks Open
Non-destructive heralded entanglement with photons is a valuable resource for quantum information processing. However, they generally entail ancillary particles and modes that amplify the circuit intricacy. To address this challenge, a rec…
View article: Shortcut to Multipartite Entanglement Generation: A Graph Approach to Boson Subtractions
Shortcut to Multipartite Entanglement Generation: A Graph Approach to Boson Subtractions Open
We propose a graph method for systematically searching for schemes that can generate multipartite entanglement in linear bosonic systems with heralding. While heralded entanglement generation offers more tolerable schemes for quantum tasks…
View article: Relative homotopy approach to topological phases in quantum walks
Relative homotopy approach to topological phases in quantum walks Open
Discrete-time quantum walks (DTQWs) provide a convenient platform for a realisation of many topological phases in noninteracting systems. They often offer more possibilities than systems with a static Hamiltonian. Nevertheless, researchers…
View article: Avenues to generalising Bell inequalities
Avenues to generalising Bell inequalities Open
Characterizing the set of all Bell inequalities is a notably hard task. An insightful method of solving it in case of Bell correlation inequalities for scenarios with two dichotomic measurements per site—for arbitrary number of parties—was…
View article: Wave–particle complementarity: detecting violation of local realism with photon-number resolving weak-field homodyne measurements
Wave–particle complementarity: detecting violation of local realism with photon-number resolving weak-field homodyne measurements Open
Nowadays photon-number resolving weak-field homodyne measurements allow realization of emblematic gedankenexperiments revealing correlations of optical fields. This covers experiments on (a) excitation of a pair of spatial modes by a singl…
View article: Comment on ‘Single particle nonlocality with completely independent reference states’
Comment on ‘Single particle nonlocality with completely independent reference states’ Open
We comment on the purported violation of local realism, by a single photon induced correlations between homodyne detectors, which one can find in: (2008) New J. Phys. 10 113024 [arXiv: 0807.0109 ]. The claim is erroneous, due to a calculat…
View article: Avenues to generalising Bell inequalities
Avenues to generalising Bell inequalities Open
Characterizing the set of all Bell inequalities is a notably hard task. An insightful method of solving it in case of Bell correlation inequalities for scenarios with two dichotomic measurements per site - for arbitrary number of parties -…
View article: Optimal interferometry for Bell$-$nonclassicality by a vacuum$-$one$-$photon qubit
Optimal interferometry for Bell$-$nonclassicality by a vacuum$-$one$-$photon qubit Open
Bell nonclassicality of a single photon superposition in two modes, often referred to as `nonlocality of a single photon', is one of the most striking nonclassical phenomena discussed in the context of foundations of quantum physics. Here …
View article: Borromean states in discrete-time quantum walks
Borromean states in discrete-time quantum walks Open
In the right conditions, removing one particle from a multipartite bound state can make it fall apart. This feature, known as the "Borromean property", has been recently demonstrated experimentally in Efimov states. One could expect that s…
View article: Can single photon excitation of two spatially separated modes lead to a violation of Bell inequality via weak-field homodyne measurements?
Can single photon excitation of two spatially separated modes lead to a violation of Bell inequality via weak-field homodyne measurements? Open
We reconsider the all-optical weak homodyne-measurement based experimental schemes aimed at revealing Bell nonclassicality (‘nonlocality’) of a single photon. We focus on the schemes put forward by Tan et al (TWC, 1991) and Hardy (1994). I…
View article: On detecting violation of local realism with photon-number resolving weak-field homodyne measurements
On detecting violation of local realism with photon-number resolving weak-field homodyne measurements Open
Non-existence of a local hidden variables (LHV) model for a phenomenon benchmarks its use in device-independent quantum protocols. Nowadays photon-number resolving weak-field homodyne measurements allow realization of emblematic gedanken e…
View article: No-go for device independent protocols with Tan-Walls-Collett `nonlocality of a single photon'
No-go for device independent protocols with Tan-Walls-Collett `nonlocality of a single photon' Open
We investigate the interferometric scheme put forward by Tan, Walls and Collett [Phys. Rev. Lett. {\bf 66}, 256 (1991)] that aims to reveal Bell non-classicality of a single photon. By providing a local hidden variable model that reproduce…
View article: Sculpting out quantum correlations with bosonic subtraction
Sculpting out quantum correlations with bosonic subtraction Open
We present a method to extract M-partie bosonic correlations from an\nN-partite maximally symmetric state (M < N) with the help of successive\napplications of single-boson subtractions. We also propose an experimental\nphotonic setup to im…
View article: Genuine multipartite indistinguishability and its detection via the generalized Hong-Ou-Mandel effect
Genuine multipartite indistinguishability and its detection via the generalized Hong-Ou-Mandel effect Open
The question whether two indistinguishable particles are bosons or fermions\ncan be answered by observing the Hong-Ou-Mandel effect on a beam splitter.\nHowever, already for three particles one can consider symmetries that are\nneither bos…
View article: Monogamy of Particle Statistics in Tripartite Systems Simulating Bosons and Fermions
Monogamy of Particle Statistics in Tripartite Systems Simulating Bosons and Fermions Open
In the quantum world, correlations can take the form of entanglement which is known to be monogamous. In this Letter we show that another type of correlation, indistinguishability, is also restricted by some form of monogamy. Namely, if pa…
View article: Generalized Probabilistic Description of Noninteracting Identical Particles
Generalized Probabilistic Description of Noninteracting Identical Particles Open
We investigate an operational description of identical noninteracting particles in multiports. In particular, we look for physically motivated restrictions that explain their bunching probabilities. We focus on a symmetric 3-port in which …
View article: How to observe duality in entanglement of two distinguishable particles
How to observe duality in entanglement of two distinguishable particles Open
The entanglement between two bosons or fermions can be accessed if there exists an auxiliary degree of freedom which can be used to label and effectively distinguish the two particles. For some types of entanglement between two indistingui…