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1
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Two-Way Teleportation

100%
Grudka A., Chhajlany R.
Acta Physica Polonica A
|
2003
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vol. 104
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issue 5
409-413
EN
A protocol for teleporting two qudits simultaneously in opposite directions using a single pair of maximally entangled qudits is presented. This procedure works provided that the product of dimensions d_1 and d_2 of the two qudits to be teleported does not exceed the dimension d of the individual qudits in the maximally entangled pair.
2
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Multiparty d-Dimensional Quantum Information Splitting

63%
Grudka A., Wójcik A.
Acta Physica Polonica A
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2002
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vol. 102
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issue 6
703-707
EN
Generalization of quantum information splitting protocol from qubits to qudits (quantum d-dimensional systems) is presented.
3
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Long-Distance Quantum Communication

63%
Duan L., Lukin M., Cirac J., Zoller P.
Acta Physica Polonica A
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2002
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vol. 101
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issue 3
325-336
EN
We show how one can use atomic ensembles in order to construct quantum repeaters. This may allow for quantum communication over arbitrarily long distances.
4
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Quantum Information Theory and Geometry of Quantum States

63%
Kuś M.
Acta Physica Polonica A
|
2001
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vol. 100
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issue Supplement
43-56
EN
The advantages of quantum information processing and transmission over corresponding classical operations are connected to the existence in composite quantum-mechanical systems states without classical counterparts - the so-called entangled states. The paper shows and examines various applications of entangled states in the quantum information theory. Recent results connected with characterization and geometry of entangled states are examined with the emphasis on some unsolved mathematical problems.
5
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An Optical Setup for Deterministic Creation of Four Partite W state

51%
Yesilyurt C., Bugu S., Diker F., Altintas A., Ozaydin F.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1230-1232
EN
In order to create polarization based entanglement networks of W₄ state, we propose an optical setup, which uses only four horizontally polarized photons as resource which implies no entanglement requirement as a resource. This setup can generate target state deterministically, by operating several quantum optical gates, which can be realized with current photonics technology. The setup we propose is composed of one Not, two Hadamard, five Controlled Not (CNot) and one Toffoli gate.
6
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Influence of the Phase on the Entanglement between a Jaynes-Cummings Atom and an Isolated Atom

51%
Pang C., Liang M.
Acta Physica Polonica A
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2014
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vol. 125
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issue 5
1069-1074
EN
A scheme is presented to generate an entangled atomic state, for which the quantum phase affects the atom-atom entanglement when the atom interacts with external light fields. The quantum phase enhances the entanglement and extends the time that the system stays in stronger entanglement state or the phase makes the system more robust. It is also shown that the quantum phase is able to delay the entanglement sudden death and hasten the entanglement revival.
7
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Quantum Fisher Information of Bipartitions of W States

51%
Ozaydin F., Altintas A., Yesilyurt C., Bugu S., Erol V.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1233-1235
EN
We study the quantum Fisher information (QFI) of W states and W-like states under decoherence. In particular, we find that on the contrary to amplitude damping and depolarizing decoherence, a W-like state of 3 qubits obtained by discarding 1 qubit of a genuine W state of 4 qubits is more robust than a genuine W state of 3 qubits under amplitude amplifying and phase damping decoherence.
8
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Quantum Information Processing Using Electron Spins in Quantum Dots

51%
Burkard G., Loss D.
Acta Physica Polonica A
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2001
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vol. 100
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issue 2
109-127
EN
We review the theoretical proposal for quantum computing with electron spins in quantum confined structures and discuss the essential requirements for its implementation. The quantum bit is represented by the spin of the electron, as opposed to the charge (orbital) degrees of freedom. In this context, we analyze a number of physical realizations of the elementary building blocks for quantum computation: a universal set of quantum gates, state preparation and measurement. Finally, we discuss the production, transport, and detection of electronic Einstein-Podolski-Rosen pairs, which are an important resource for quantum communication.
9
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Remarks on Entanglement, its Sources and Applications

51%
Żukowski M.
Acta Physica Polonica A
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2002
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vol. 101
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issue 1
21-35
EN
We shall discuss the central role played in the quantum information theory by entanglement. A generalized version of Bell's theorem will be presented, as well as methods in multiphoton interferometry to obtain correlations violating the Bell inequalities. Finally, we shall present some quantum informational applications of entanglement.
10
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Quantum Phase Transition in the One-Dimensional XZ Model

51%
Brzezicki W., Oleś A.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
162-164
EN
We introduce a one-dimensional XZ model with alternating σ_i^zσ_{i+1}^z and σ_i^xσ_{i+1}^x interactions on even/odd bonds, interpolating between the Ising model and the quantum compass model. We present two ways of its exact solution by: (i) mapping to the quantum Ising models, and (ii) using fermions with spin 1/2. In certain cases the nearest neighbor pseudospin correlations change discontinuously at the quantum phase transition, where one finds highly degenerate ground state of the 1D compass model.
11
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Tunable Entanglement Sudden Death and Birth in Cavity QED with Nonlinear Kerr-Like Medium

51%
He Q., Xu J.
Acta Physica Polonica A
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2011
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vol. 120
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issue 3
390-396
EN
The influence of nonlinear Kerr-like medium on the phenomenon of entanglement sudden death and birth in a double Jaynes-Cummings model is investigated. It is shown that the entanglement sudden death and birth phenomenon may appear in this system and the duration of entanglement sudden death and birth can be controlled by the nonlinear Kerr-like medium. Particularly, the phenomenon of entanglement sudden death and birth disappears one after another if we increase the value of the Kerr coefficient χ continuously, and all disappears if the value of the Kerr coefficient χ is large enough.
12
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The Rule for Evolution of Cooperation in Quantum Games

51%
Sun Z.
Acta Physica Polonica A
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2009
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vol. 116
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issue 2
135-140
EN
Cooperation is essential to biological organizations and human society. In this paper, the conditions of dilemmas resolving by quantum strategies in the three games, Prisoners' Dilemma, Chicken Game and Stag Hunt, are presented. The rule for the evolution of cooperation in general quantum games, b/c > coth^{2}γ, is put forward. The formation of the rule is similar to those of the five rules in the classical game theory summarized by Nowak. b/c is still the benefit-to-cost ratio of the altruistic act, while γ is a measure for the game's entanglement. The rule is the prerequisite for the realization of cooperation in quantum games.
13
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On Mixed States Entanglement and Quantum Communication: Aspects of Quantum Channels Theory

51%
Horodecki P.
Acta Physica Polonica A
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2002
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vol. 101
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issue 3
399-424
EN
Basic aspects of quantum communication based on quantum channels theory are reviewed together with suitable examples. The key notion of quantum channel capacity is discussed. The role of mixed states entanglement as a practical tool in quantum channels theory is explained in detail. Application of recent results on non-positive partial transpose bound entanglement conjecture to binding entanglement channels shows that validity of the conjecture for some states implies nonadditivity of two-way quantum channel capacity. Some aspects of robustness of entanglement in context of positive maps theory are also discussed.
14
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Translating Concepts of State Transfer to Spin-1 Chains

51%
Wieśniak M., Dutta A., Ryu J.
Acta Physica Polonica A
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2015
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vol. 128
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issue 1
3-5
EN
State transfer is a well-known routine for various systems of spins-1/2. Still, it is not well studied for chains of spins of larger magnitudes. In this contribution we argue that while perfect state transfer may seem unnatural in spin-1 systems, it is still feasible for arrays of V-type three-level atoms. Tomography of such 1D array is also shown to be possible by acting on one atom from such an array.
15
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Entanglement and Statistical Properties of a System Consisting of Three-Level Atom Interacting with a Nonlinear Kerr Medium Field

51%
Abdel-Khalek S., Al-Rajhi M., Berrada K.
Acta Physica Polonica A
|
2016
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vol. 129
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issue 6
1083-1088
EN
In this paper, we present a proper quantum system to perform different tasks of quantum information processing with optimal conditions. We study the populations, entanglement, and nonclassical properties of a system consisting of three level atom interacting with a nonlinear Kerr medium field constructed in the framework of generalized Heisenberg algebra. We quantify these quantities in terms of different parameters involved in the whole system considering the case of moving and stationary atom in the real experimental meaning of the coupling constant. The nonlinearity introduced by these kinds of fields play a useful role to create high amount of entanglement during the time evolution. Interestingly, the relationship between the degree of nonlinearity and robust of entanglement is explored in this present model.
16
Content available remote

Behavior of Quantum Fisher Information of Bell Pairs under Decoherence Channels

51%
Ozaydin F., Altintas A., Bugu S., Yesilyurt C.
Acta Physica Polonica A
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2014
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vol. 125
|
issue 2
606-607
EN
Quantum Fisher information has recently been an essential tool for analyzing the phase sensitivity of the quantum states in various quantum tasks, requiring high precision, such as quantum clock synchronization, positioning and many applications which include quantum interferometers. Due to the interactions with the environment, all quantum systems are subject to various decoherence effects. Therefore the research on quantum Fisher information under decoherence has been recently attracting more attention. In this work, analyzing the quantum Fisher information, we study the phase sensitivity of bipartite quantum correlations, in particular four Bell pairs amplitude damping channels. For a specific Bell state we arrive at similar results of Greenberger-Horne-Zeilinger (GHZ) states (as expected). For the other three Bell states, we present our results which point the interesting behavior of quantum Fisher information with respect to the decoherence rate. We also find the regions where the quantum Fisher information exhibits discontinuities.
17
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Two models of quantum random walk

45%
Košík J.
Open Physics
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2003
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vol. 1
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issue 4
556-573
EN
We present an overview of two models of quantum random walk. In the first model, the discrete quantum random walk, we present the explicit solution for the recurring amplitude of the quantum random walk on a one-dimensional lattice. We also introduce a new method of solving the problem of random walk in the most general case and use it to derive the hitting amplitude for quantum random walk on the hypercube. The second is a special model based on a local interaction between neighboring spin-1/2 particles on a one-dimensional lattice. We present explicit results for the relevant quantities and obtain an upper bound on the speed of convergence to limiting probability distribution.
18
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Josephson-Like Effect in Mesoscopic Loop Structures

45%
Paśko W.
Acta Physica Polonica A
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2005
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vol. 108
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issue 5
817-824
EN
The quantum interference is considered in time-dependent magnetic field that is quantum beats in mesoscopic loop structure. The similarities between this effect and Josephson, scalar Aharonov-Bohm and Aharonov-Casher effects, as well as their differences are treated and a possible application of the effect to the construction of the device, complementary to SQUIDs, is analysed.
19
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On entanglement distillation and quantum error correction for unknown states and channels

38%
Horodecki P.
Open Physics
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2003
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vol. 1
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issue 4
695-707
EN
We consider the problem of invariance of distillable entanglement D and quantum capacities Q under erasure of information about single copy of quantum state or channel respectively. We argue that any 2 ⊗N two-way distillable state is still two-way distillable after erasure of single copy information. For some known distillation protocols the obtained two-way distillation rate is the same as if Alice and Bob knew the state from the very beginning. The isomorphism between quantum states and quantum channels is also investigated. In particular it is pointed out that any transmission rate down the channel is equal to distillation rate with formal LOCC-like superoperator that uses in general nonphysical Alice actions. This allows to we prove that if given channel Λ has nonzero capacity (Q → or Q ⟺) then the corresponding quantum state ϱ(Λ) has nonzero distillable entanglement (D → or D ⟺). Follwoing the latter arguments are provided that any channel mapping single qubit into N level system allows for reliable two-way transmission after erasure of information about single copy. Some open problems are discussed.
20
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Uncertainty relations expressed by Shannon-like entropies

32%
Majerník V., Majerníková E., Shpyrko S.
Open Physics
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2003
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vol. 1
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issue 3
393-420
EN
Besides the well-known Shannon entropy, there is a set of Shannon-like entropies which have applications in statistical and quantum physics. These entropies are functions of certain parameters and converge toward Shannon entropy when these parameters approach the value 1. We describe briefly the most important Shannon-like entropies and present their graphical representations. Their graphs look almost identical, though by superimposing them it appears that they are distinct and characteristic of each Shannon-like entropy. We try to formulate the alternative entropic uncertainty relations by means of the Shannon-like entropies and show that all of them equally well express the uncertainty principle of quantum physics.
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