299 citations · 1.3k across the 41 of their papers we have counts for
41 papers · 1 filter
Tangible reduction in learning sample complexity with large classical samples and small quantum system
Wooyeong Song, Marcin Wieśniak, Nana Liu +4
Quantum computation requires large classical datasets to be embedded into quantum states in order to exploit quantum parallelism. However, this embedding requires considerable reso…
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…
Higher dimensional entanglement without correlations
Waldemar Klobus, Wieslaw Laskowski, Tomasz Paterek +2
It has been demonstrated both theoretically and experimentally that genuine multipartite entanglement between qubits can exist even in the absence of multipartite correlations. Her…
Experimental Quantum Solution to the Dining Cryptographers Problem
Alley Hameedi, Breno Marques, Sadiq Muhammad +2
Quantum resources such as superposition and entanglement have been used to provide unconditional key distribution, secret sharing and communication complexity reduction. In this le…
Entanglement indicators for quantum optical fields: three-mode multiport beamsplitters EPR interference experiments
Junghee Ryu, Marcin Marciniak, Marcin Wieśniak +1
We generalize a new approach to entanglement conditions for light of undefined photons numbers given in [Phys. Rev. A {\bf 95}, 042113 (2017)] for polarization correlations to a br…
Normalized Stokes operators for polarization correlations of entangled optical fields
Marek Zukowski, Wieslaw Laskowski, Marcin Wiesniak
Stokes parameters are a standard tool in quantum optics. They involve averaged intensities at exits of polarizers. If the overall measured intensity fluctuates, as e.g. for states…
Bell Inequalities for Quantum Optical Fields
Marek Zukowski, Marcin Wiesniak, Wieslaw Laskowski
We show that the "practical" Bell inequalities, which use intensities as the observed variables, commonly used in quantum optics and widely accepted in the community, suffer from a…
Highly noise resistant multipartite quantum correlations
Wieslaw Laskowski, Tamas Vertesi, Marcin Wiesniak
We analyze robustness of correlations of the -qubit GHZ and Dicke states against white noise admixture. For sufficiently large , the Dicke states (for any number of excitatio…
Multipartite entanglement detection with minimal effort
Lukas Knips, Christian Schwemmer, Nico Klein +2
Certifying entanglement of a multipartite state is generally considered as a demanding task. Since an qubit state is parametrized by real numbers, one might naively e…
Quantum Byzantine Agreement via Hardy correlations and entanglement swapping
Ramij Rahaman, Marcin Wieśniak, Marek Żukowski
We present a device-independent quantum scheme for the {\em Byzantine Generals} problem. The protocol is for three parties. Party is to send two identical one bit messages to p…
Two Copies of the Einstein-Podolsky-Rosen State of Light Lead to Refutation of EPR Ideas
Krzysztof Rosołek, Magdalena Stobińska, Marcin Wieśniak +1
Bell's theorem applies to the normalizable approximations of the original Einstein-Podolsky-Rosen (EPR) state. The constructions of the proof require measurements difficult to perf…
Translating Concepts of State Transfer to Spin-1 Chains
Marcin Wiesniak, Arijit Dutta, Jeonghee Ryu
State transfer is a well-known routine for various systems of spins-. Still, it is not well studied for chains of spins of larger magnitudes. In this contribution we arg…
Comment on "Two Fundamental Experimental Tests of Nonclassicality with Qutrits"
Radek Lapkiewicz, Peizhe Li, Christoph Schaeff +4
In a recent paper [arXiv:1301.2887] Ahrens et al. claim that our "(...) experiment on qutrits does not test Klyachko et al.'s inequality, but an inequality with extra correlations"…
Experimental multi-location remote state preparation
Magnus Radmark, Marcin Wiesniak, Marek Zukowski +1
Transmission of quantum states is a central task in quantum information science. Remote state preparation (RSP) has the same goal as teleportation, i.e. transferring quantum inform…
True Multipartite Entanglement Hardy Test
Ramij Rahaman, Marcin Wieśniak, Marek Żukowski
Quantum mechanics allows systems to be entangled with each other, which results in stronger than classical correlations. Many methods of identifying entanglement have been proposed…
Comment on "State-Independent Experimental Test of Quantum Contextuality in an Indivisible System"
E. Amselem, M. Bourennane, C. Budroni +5
We argue that the experiment described in the recent Letter by Zu et al. [Phys. Rev. Lett. 109, 150401 (2012); arXiv:1207.0059v1] does not allow to make conclusions about contextua…
Multi-photon quantum interference with high visibility using multiport beam splitters
M. Stobińska, W. Laskowski, M. Wieśniak +1
Multi-photon states can be produced in multiple parametric down conversion (PDC) processes. The nonlinear crystal in such a case is pumped with high power. In theory, the more popu…
Communication Complexity Reduction from Globally Uncorrelated States
Marcin Wiesniak
Bell inequality violating entangled states are the working horse for many potential quantum information processing applications, including secret sharing, cryptographic key distrib…
Incompatible local hidden-variable models of quantum correlations
Wieslaw Laskowski, Marcin Markiewicz, Tomasz Paterek +1
We show a quantum state with explicit local hidden-variable models for correlations between any fixed number of subsystems which cannot be extended to a model simultaneously descri…
Multisetting Bell inequalities for spins-1 avoiding KS contradiction
Arijit Dutta, Marcin Wieśniak, Marek Żukowski
Bell's theorem for systems more complicated than two qubits faces a hidden, as yet undiscussed, problem. One of the methods to derive Bell's inequalities is to assume existence of…
N-particle nonclassicality without N-particle correlations
Marcin Wieśniak, Mohamed Nawareg, Marek Żukowski
Most of known multipartite Bell inequalities involve correlation functions for all subsystems. They are useless for entangled states without such correlations. We give a method of…
Experimental non-classicality of an indivisible quantum system
Radek Lapkiewicz, Peizhe Li, Christoph Schaeff +4
Quantum theory demands that, in contrast to classical physics, not all properties can be simultaneously well defined. The Heisenberg Uncertainty Principle is a manifestation of thi…
Finding Traps in Non-linear Spin Arrays
Marcin Wiesniak, Marcin Markiewicz
Precise knowledge of the Hamiltonian of a system is a key to many of its applications. Tasks such state transfer or quantum computation have been well studied with a linear chain,…
One-Qubit and Two-Qubit Codes in Noisy State Transfer
Marcin Markiewicz, Marcin Wieśniak
Quantum state transfer is a procedure, which allows to exchange quantum information between stationary qubit systems. It is anticipated that the transfer will find applications in…