8.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Polish Academy of SciencesPL234 papers
- Institute of Molecular Physics of the Polish Academy of SciencesPL159 papers
- Centre National de la Recherche ScientifiqueFR113 papers
- University of MichiganUS94 papers
- RIKENJP89 papers
- European Southern ObservatoryCL83 papers
- Palacký University OlomoucCZ77 papers
- University of EdinburghGB74 papers
- Nicolaus Copernicus Astronomical CenterPL73 papers
- Royal ObservatoryGB73 papers
- University of WarsawPL72 papers
- Institute of PhysicsPL68 papers
20 papers · 2 filters
Quantum scissors - finite-dimensional states engineering
W. Leoński, A. Kowalewska-Kudłaszyk
This work discusses quantum states defined in a finite-dimensional Hilbert space. In particular, after the presentation of some of them and their basic properties the work concentr…
Robust Device-Independent Randomness Amplification with Few Devices
Fernando G. S. L. Brandao, Ravishankar Ramanathan, Andrzej Grudka +5
Randomness amplification is the task of transforming a source of somewhat random bits into a source of fully random bits. Although it is impossible to amplify randomness from a sin…
Efficient Amplification of Photonic Qubits by Optimal Quantum Cloning
Karol Bartkiewicz, Antonín Černoch, Karel Lemr +2
We demonstrate that a phase-independent quantum amplifier of a polarization qubit is a complementary amplifier of the heralded qubit amplifier [N. Gisin, S. Pironio and N. Sangouar…
State-dependent linear-optical qubit amplifier
Karol Bartkiewicz, Antonín Černoch, Karel Lemr
We propose a linear-optical setup for heralded qubit amplification with tunable output qubit fidelity. We study its success probability as a function of output qubit fidelity showi…
Coherent states of composite bosons
Su-Yong Lee, Jayne Thompson, Pawel Kurzynski +2
We present a systematic analysis on coherent states of composite bosons consisting of two distinguishable particles. By defining an effective composite boson (coboson) annihilation…
Controllable microwave three-wave mixing via a single three-level superconducting quantum circuit
Yu-xi Liu, Hui-Chen Sun, Z. H. Peng +3
Three-wave mixing in second-order nonlinear optical processes cannot occur in atomic systems due to the electric-dipole selection rules. In contrast, we demonstrate that second-ord…
Direct method for measuring of purity, superfidelity, and subfidelity of photonic two-qubit mixed states
Karol Bartkiewicz, Karel Lemr, Adam Miranowicz
The Uhlmann-Jozsa fidelity (or, equivalently, the Bures distance) is a basic concept of quantum communication and quantum information, which however is very difficult to measure ef…
When Are Popescu-Rohrlich Boxes and Random Access Codes Equivalent?
Andrzej Grudka, Karol Horodecki, Michał Horodecki +2
We study a problem of interconvertibility of two supra-quantum resources: one is so called PR-box, which violates CHSH inequality up to maximal algebraic bound, and second is so ca…
Phase-space interference of states optically truncated by quantum scissors: Generation of distinct superpositions of qudit coherent states by displacement of vacuum
Adam Miranowicz, Malgorzata Paprzycka, Anirban Pathak +1
Conventional Glauber coherent states (CS) can be defined in several equivalent ways, e.g., by displacing the vacuum or, explicitly, by their infinite Poissonian expansion in Fock s…
Fundamental monogamy relation between contextuality and nonlocality
Pawel Kurzynski, Adan Cabello, Dagomir Kaszlikowski
We show that the no-disturbance principle imposes a tradeoff between locally contextual correlations violating the Klyachko-Can-Binicioglu-Shumovski inequality and spatially separa…
Contextuality in bosonic bunching
Pawel Kurzynski, Akihito Soeda, Jayne Thompson +1
We show that under certain assumptions one can derive a variant of Specker's non-contextual inequality for a system of three indistinguishable bosonic particles. The inequality sta…
Entanglement estimation from Bell inequality violation
Karol Bartkiewicz, Bohdan Horst, Karel Lemr +1
It is well known that the violation of Bell's inequality in the form given by Clauser, Horne, Shimony, and Holt (CHSH) in two-qubit systems requires entanglement, but not vice vers…
Driving a mechanical resonator in to coherent states via random measurements
Lluc Garcia, Ravindra W. Chhajlany, Yong Li +1
We propose dynamical schemes to engineer coherent states of a mechanical resonator coupled to an ancillary, superconducting flux qubit. The flux qubit, when repeatedly projected on…
Recent advances in contextuality tests
Jayne Thompson, Pawel Kurzynski, Su-Yong Lee +2
Our everyday experiences support the hypothesis that physical systems exist independently of the act of observation. Concordant theories are characterized by the objective realism…
Efficient tomography of quantum-optical Gaussian processes probed with a few coherent states
Xiang-Bin Wang, Zong-Wen Yu, Jia-Zhong Hu +2
An arbitrary quantum-optical process (channel) can be completely characterized by probing it with coherent states using the recently developed coherent-state quantum process tomogr…
Sensitivity of the decay of entanglement of quantum dot spin qubits to the magnetic field
Paweł Mazurek, Katarzyna Roszak, Ravindra W. Chhajlany +1
We study the decay of entanglement of quantum dot electron-spin qubits under hyperfine interaction mediated decoherence. We show that two qubit entanglement of a single entangled i…
Free randomness amplification using bipartite chain correlations
Andrzej Grudka, Karol Horodecki, Michał Horodecki +3
A direct analysis of the protocol of randomness amplification using Bell inequality violation is performed in terms of the convex combination of no-signaling boxes required to simu…
Unified approach to contextuality, non-locality, and temporal correlations
M. Markiewicz, P. Kurzynski, J. Thompson +4
We highlight the existence of a joint probability distribution as the common underpinning assumption behind Bell-type, contextuality, and Leggett-Garg-type tests. We then present a…
An experimental proposal for revealing contextuality in almost all qutrit states
Jayne Thompson, Robert Pisarczyk, Pawel Kurzynski +1
Contextuality is a foundational phenomenon underlying key differences between quantum theory and classical realistic descriptions of the world. Here we propose an experimental test…
Two-qubit mixed states more entangled than pure states: Comparison of the relative entropy of entanglement for a given nonlocality
Bohdan Horst, Karol Bartkiewicz, Adam Miranowicz
Amplitude damping changes entangled pure states into usually less-entangled mixed states. We show, however, that even local amplitude damping of one or two qubits can result in mix…