26 citations · 87 across the 11 of their papers we have counts for
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"Nonlocality-of-a-single-photon" based Quantum Key Distribution and Random Number Generation schemes and their device-independent security analysis
Konrad Schlichtholz, Bianka Woloncewicz, Tamoghna Das +2
The question of ``non-locality of a single photon'', which started with a paper by Tan, Walls and Collett (TWC, 1991) stirred a thirty years long debate. This hampered attempts to…
Quantitative non-classicality of mediated interactions
Ray Ganardi, Ekta Panwar, Mahasweta Pandit +2
In plethora of physical situations one can distinguish a mediator -- a system that couples other, non-interacting systems. Often the mediator itself is not directly accessible to e…
Improved entanglement indicators for optical fields and its application in the event-ready experiment for bright squeezed vacuum with induced non-gaussianity
Bianka Woloncewicz, Tamoghna Das, Marek Żukowski
Better versions of separability conditions for four mode optical fields, i.e. two beams with two modes of mutually orthogonal polarization are given. Our conditions involve varianc…
Simplified Quantum Optical Stokes observables and Bell's Theorem
Konrad Schlichtholz, Bianka Woloncewicz, Marek Żukowski
We introduce a simplified form of Stokes operators for quantum optical fields that involve the known concept of binning. Behind polarization analyzer photon numbers (more generally…
Comment on `Single particle nonlocality with completely independent reference states'
Tamoghna Das, Marcin Karczewski, Antonio Mandarino +3
We comment on the purported violation of local realism, by a single photon induced correlations between homodyne detectors, which one can find in: New J. Phys. 10, 113024 (2008), […
On detecting violation of local realism with photon-number resolving weak-field homodyne measurements
Tamoghna Das, Marcin Karczewski, Antonio Mandarino +3
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 homod…
Can single photon excitation of two spatially separated modes lead to a violation of Bell inequality via homodyne measurements?
Tamoghna Das, Marcin Karczewski, Antonio Mandarino +3
We reconsider the all-optical homodyne-measurement based experimental schemes that aim to reveal Bell nonclassicality of a single photon, often termed `nonlocality'. We focus on th…
No-go for device independent protocols with Tan-Walls-Collett `nonlocality of a single photon'
Tamoghna Das, Marcin Karczewski, Antonio Mandarino +3
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…
Non-classicality of bright GHZ-like radiation of an optical parametric source
Konrad Schlichtholz, Bianka Woloncewicz, Marek Żukowski
With the emerging possibility to obtain emissions of triples of GHZ-entangled photons via a direct parametric generation we study here bright emissions of this kind which involve h…
Distance between Bound Entangled States from Unextendible Product Bases and Separable States
Marcin Wieśniak, Palash Pandya, Omer Sakarya +1
We discuss the use of the Gilbert algorithm to tailor entanglement witnesses for unextendibleproduct basis bound entangled states (UPB BE states). The method relies on the fact tha…
General mapping of multi-quit entanglement conditions to non-separability indicators for quantum optical fields
Junghee Ryu, Bianka Woloncewicz, Marcin Marciniak +2
We show that any multi-qudit entanglement witness leads to a non-separability indicator for quantum optical fields, which involves intensity correlations. We get, e.g., necessary a…