Temat: 03.65.Ud - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Quantum Information Theory and Geometry of Quantum States
Autorzy:: Kuś, M.
Tematy:: 03.65.Ud
03.67.-a; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2030373.pdf Link otwiera się w nowym oknie
Opis:: 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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Some Examples of Post-Measurement Nonlocal Gates
Autorzy:: Song, D.
Tematy:: 03.67.Lx
03.65.Ud; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1489820.pdf Link otwiera się w nowym oknie
Opis:: Several proposed quantum computer models include measurement processes, in order to implement nonlocal gates and create necessary entanglement resources during the computation. We discuss some examples in which the measurements can be delayed for two- and three-qubit nonlocal gates. We also discuss implementing arbitrary nonlocal gates when measurements are included during the process.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Disentanglement and Black Holes: Information Problem
Autorzy:: Radosz, A.
Gusin, P.
Roszak, K.
Tematy:: 04.70.Dy
03.65.Ud; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1033709.pdf Link otwiera się w nowym oknie
Opis:: One of the possible ways of formulation of an information loss paradox refers to an entanglement of the two particles created in a vicinity of an event horizon. Evolution of the entangled particles and an interaction with their own environments should lead to a decay of the entanglement. However obvious, such a perspective appears to be too naive in this case.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: EPR Paradox Solved by Special Theory of Relativity
Autorzy:: Lee, J.
Tematy:: 03.65.Ud; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1198533.pdf Link otwiera się w nowym oknie
Opis:: This paper uses the special theory of relativity to introduce a novel solution to Einstein-Podolsky-Rosen paradox. More specifically, the faster-than-light communication is described to explain two types of EPR paradox experiments: photon polarization and electron-positron pair spins. Most importantly, this paper explains why this faster-than-light communication does not violate the special theory of relativity.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The Effect of Field Changing on Two Qubit Entanglement with Different Criteria
Autorzy:: Mirzaee, M.
Batavani, M.
Tematy:: 03.65.Ud; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1398634.pdf Link otwiera się w nowym oknie
Opis:: We investigate the effect of field changing on two qubit entanglement. We choose the coherent state, the cat state and the squeezed state as different states of interacting field with atom. The correlation between two qubits can be degraded by environmental noise, this phenomenon has been labelled sudden death of entanglement. The double Jaynes-Cummings model as a solvable model is used for describing the dynamic of sudden death of entanglement. We measure two-qubit entanglement using the concurrence and the negativity. The Fisher information is introduced, too, and compares results with previous entanglement measures. Finally we conclude that the Fisher information is not an entanglement measure.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Behavior of Quantum Fisher Information of Bell Pairs under Decoherence Channels
Autorzy:: Ozaydin, F.
Altintas, A.
Bugu, S.
Yesilyurt, C.
Tematy:: 03.67.-a
03.65.Ud
03.65.Yz; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1194957.pdf Link otwiera się w nowym oknie
Opis:: 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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Quantum Fisher Information of Bipartitions of W States
Autorzy:: Ozaydin, F.
Altintas, A.
Yesilyurt, C.
Bugu, S.
Erol, V.
Tematy:: 03.67.-a
03.65.Ud
03.65.Yz; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1192332.pdf Link otwiera się w nowym oknie
Opis:: 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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Tunable Entanglement Sudden Death and Birth in Cavity QED with Nonlinear Kerr-Like Medium
Autorzy:: He, Q.
Xu, J.
Tematy:: 03.65.Ud
03.67.-a
03.67.Mn; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1493398.pdf Link otwiera się w nowym oknie
Opis:: 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.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 9.

Tytuł:: Non-Markovian Dynamic of Gaussian Quantum Discord in Continuous-Variable Systems
Autorzy:: Liu, X.
Wu, W.
Tematy:: 03.65.Yz
03.65.Ta
03.65.Ud
03.67.Mn; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1203878.pdf Link otwiera się w nowym oknie
Opis:: We show the special dynamic characteristic of Gaussian quantum discord, exhibited by two-mode Gaussian symmetric squeezed thermal states (STS) in continuous-variable (CV) systems with a common non-Markovian environment, is definitely different from Markov processes. We demonstrate that Gaussian quantum discord can be created whenever the information flow from environment back to the system. We also show that the rate of decrease for Gaussian quantum discord is related to the coupling constant. We discover that the initial value of Gaussian quantum discord is determined by the average number of thermal photons of the system.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 10.

Tytuł:: Influence of the Phase on the Entanglement between a Jaynes-Cummings Atom and an Isolated Atom
Autorzy:: Pang, C.
Liang, M.
Tematy:: 03.65.Ud
42.50.Dv
03.67.-a; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1198513.pdf Link otwiera się w nowym oknie
Opis:: 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.
Dostawca treści:: Biblioteka Nauki

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