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Tytuł:
Decoherence and Noise in Loschmidt Echo Experiments
Autorzy:
Alicki, R.
Miklaszewski, W.
Pogorzelska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2044622.pdf
Data publikacji:
2006-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Yz
Opis:
We discuss some recent results concerning the decoherence in controlled quantum open systems within the mathematical setting corresponding to motion reversal experiments (the Loschmidt echo). We compare the case of randomly chosen sequence of unitary dynamical maps with the case of a constant dynamics corresponding to a classically chaotic evolution. The interplay between chaos and decoherence is illustrated by the new numerical results on the quantum Arnold cat map perturbed by a measurement process. Open problems related to the simple operational characterization of the decoherence strength are discussed.
Źródło:
Acta Physica Polonica A; 2006, 109, 1; 121-129
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carrier Spin Dephasing during Spin-Preserving Tunneling in Coupled Quantum Dots
Autorzy:
Krzykowski, M.
Gawełczyk, M.
Machnikowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1185791.pdf
Data publikacji:
2016-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.75.-d
03.65.Yz
Opis:
In this contribution we study carrier tunneling in a system consisting of a pair of coupled quantum dots. We predict the presence of a spin dephasing channel in such a system, which is associated with a "welcher-weg" type of decoherence process occurring during carrier tunneling. In our model such a process is caused by a mismatch of g-factor values in two quantum dots in the presence of external magnetic field. This leads to a mismatch in spin Zeeman splitting between the dots and, in consequence, to the distinguishability of phonons emitted during the tunneling of carriers with opposite spins. Thus we demonstrate a process of spin dephasing without any direct spin-environment coupling present in the model.
Źródło:
Acta Physica Polonica A; 2016, 130, 5; 1165-1168
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accuracy of Effective Mass Equation for a Single and Double Cylindrical Quantum Dot
Autorzy:
Mielnik-Pyszczorski, A.
Gawarecki, K.
Machnikowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1033130.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.75.-d
03.65.Yz
Opis:
In this contribution we study the accuracy of various forms of electron effective mass equation in reproducing spectral and spin-related features of quantum dot systems. We compare the results of the standard 8 band k·p model to those obtained from effective mass equations obtained by perturbative elimination procedures in various approximtions for a cylindrical quantum dot or a system of two such dots. We calculate the splitting of electronic shells, the electron g-factor and spin-orbit induced spin mixing and show that for a cylindrical dot the g-factor is reproduced very exactly, while for the two other quantities the effective mass equation is much less accurate.
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 376-379
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Behavior of Quantum Fisher Information of Bell Pairs under Decoherence Channels
Autorzy:
Ozaydin, F.
Altintas, A.
Bugu, S.
Yesilyurt, C.
Powiązania:
https://bibliotekanauki.pl/articles/1194957.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.67.-a
03.65.Ud
03.65.Yz
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.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 606-607
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum Fisher Information of Bipartitions of W States
Autorzy:
Ozaydin, F.
Altintas, A.
Yesilyurt, C.
Bugu, S.
Erol, V.
Powiązania:
https://bibliotekanauki.pl/articles/1192332.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.67.-a
03.65.Ud
03.65.Yz
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.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1233-1235
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Optical Setup for Deterministic Creation of Four Partite W state
Autorzy:
Yesilyurt, C.
Bugu, S.
Diker, F.
Altintas, A.
Ozaydin, F.
Powiązania:
https://bibliotekanauki.pl/articles/1401331.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.67.-a
03.65.Ud
03.65.Yz
Opis:
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.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1230-1232
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of a Two-Qubit Decoherence by Using Bloch Vectors
Autorzy:
Ahmadi, F.
Jami, S.
Powiązania:
https://bibliotekanauki.pl/articles/1364150.pdf
Data publikacji:
2014-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Yz
03.67.Pp
03.65.-w
Opis:
The loss of the coherence happens due to the interaction between the desired system and its surroundings. Addressing decoherence is one of the main concepts in the study of quantum channels to access their potential for various scale. In this process the information of the system is penetrated into the environment. Therefore, the measurement of the environment could be used as the error correction method. Phase damping channels principally belong to random unitary channels and can be corrected by classical information. This paper presents a method to generate non-random unitary phase damping channels based on the Bloch vectors in two qubits systems. A phase damping channel which consisted of a two qubits system and a single qubit environment was investigated. The results demonstrated that the phase damping channels belong to random unitary dynamics if the three-dimensional tetrahedron volume spanned by the Bloch vectors in $ℝ^3$ is not zero, or, the same hyperplane in $ℝ^3$ was not pointed by the Bloch vectors. It is found that the Bell state belongs to random unitary class and can be corrected based on classical information obtained from environmental measurements.
Źródło:
Acta Physica Polonica A; 2014, 125, 5; 1088-1092
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonexistence of the Classical Trajectories in the Stern-Gerlach Experiment
Autorzy:
Arsenijević, M.
Dugić, M.
Powiązania:
https://bibliotekanauki.pl/articles/1537871.pdf
Data publikacji:
2010-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Ta
03.65.Yz
81.16.Ta
Opis:
The Stern-Gerlach experiment is a paradigm of the quantum measurement of spin. Its physical interpretation is in intimate relation with the physical basis of the current research in the atomic (molecular) nanofabrication procedures. Nevertheless, interpretation of the experiment is an open issue yet. Here, we give the arguments for the physical nonexistence of the so-called classical trajectories of the atoms (molecules) in front of the screen. Some nanotech-related consequences are distinguished.
Źródło:
Acta Physica Polonica A; 2010, 117, 5; 760-763
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Control of Entanglement in a Damped Jaynes-Cummings Model by Transient Effects
Autorzy:
Kayhan, H.
Powiązania:
https://bibliotekanauki.pl/articles/1401862.pdf
Data publikacji:
2015-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Ud
42.50.Ct
03.65.Yz
Opis:
In this work, we study the entanglement dynamics of the damped Jaynes-Cummings model with the transient effects modeled as the linear sweep of the coupling coefficient between the atom and the field. We show that the decoherence of the entanglement can be controlled by the transient effects under the influence of damping. These effects can accelerate and can decelerate the decoherence of the entanglement during the time-evolution of the system, by adjusting the frequency of the Rabi oscillations.
Źródło:
Acta Physica Polonica A; 2015, 128, 3; 256-258
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complete and Partial Loss of Entanglement Due to a Phonon-Assisted Dephasing Process
Autorzy:
Roszak, K.
Machnikowski, P.
Jacak, L.
Powiązania:
https://bibliotekanauki.pl/articles/2046996.pdf
Data publikacji:
2006-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.67.Lx
03.65.Yz
63.20.Kr
Opis:
We study the evolution of entanglement between two excitons in a double quantum dot system coupled to a super-Ohmic reservoir. As expected entanglement is more fragile than local coherence, but, surprisingly, for a set of pure states disentanglement can be complete in a finite time under conditions that lead to the usual partial pure-dephasing.
Źródło:
Acta Physica Polonica A; 2006, 110, 3; 331-336
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-Markovian Dynamic of Gaussian Quantum Discord in Continuous-Variable Systems
Autorzy:
Liu, X.
Wu, W.
Powiązania:
https://bibliotekanauki.pl/articles/1203878.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Yz
03.65.Ta
03.65.Ud
03.67.Mn
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.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 652-655
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phonon-Induced Dephasing of Optically Driven Exciton States in Quantum Dots: Spectral Interpretation
Autorzy:
Machnikowski, P.
Jacak, L.
Powiązania:
https://bibliotekanauki.pl/articles/2044498.pdf
Data publikacji:
2005-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Hc
63.20.Kr
03.65.Yz
Opis:
We discuss phonon-induced perturbation of optically driven coherent dynamics of a confined exciton in a quantum dot in terms of nonlinear spectra of the driving pulse. Damping of pulse-area-dependent Rabi oscillations and phonon-assisted pumping of optically inactive states are analyzed.
Źródło:
Acta Physica Polonica A; 2005, 108, 5; 761-767
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Entanglement in Open Quantum Systems
Autorzy:
Buchleitner, A.
Carvalho, A. R. R.
Mintert, F.
Powiązania:
https://bibliotekanauki.pl/articles/2047819.pdf
Data publikacji:
2007-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.67.Mn
03.65.Ud
03.65.Yz
42.50.Lc
Opis:
We give a compact review of some of our recent results on the quantification, the measurement, and the time evolution of entanglement in open quantum systems of variable structure and dimension. Also a first experimental implementation is briefly discussed.
Źródło:
Acta Physica Polonica A; 2007, 112, 4; 575-588
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Collective Spontaneous Emission from a System of Quantum Dots
Autorzy:
Abdussalam, W.
Machnikowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1403617.pdf
Data publikacji:
2012-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Hc
42.50.Ct
03.65.Yz
Opis:
We study the spontaneous emission from a regular lateral array or a randomly distributed ensemble of quantum dots under strong excitation (full inversion) conditions. We focus on the similarities and differences between the cases of random and regular arrangement of the dots and show that there is very little difference between the evolution of luminescence in these two cases, both for identical dots and for a realistically inhomogeneously broadened ensemble. This means that the enhanced emission or superradiance effect is not due to accidental clustering of pairs of dots. Moreover, we point out that observation of an enhanced emission under weak excitation does not prove that true superradiance will develop in a fully inverted system.
Źródło:
Acta Physica Polonica A; 2012, 122, 6; 994-996
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Collective Spontaneous Emission from Pairs of Quantum Dots: Long-Range vs. Short-Range Couplings
Autorzy:
Abdussalam, W.
Machnikowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1492857.pdf
Data publikacji:
2011-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Hc
42.50.Ct
03.65.Yz
Opis:
We study the spontaneous emission from a coherently delocalized exciton state in a double quantum dot as a function of the distance between the dots, focusing on the similarities and differences between the cases of radiative (long-range, dipole) and tunnel coupling between the excitons in the dots. We show that there may be no qualitative difference between the collective emission induced by these two coupling types in spite of their essentially different physical properties.
Źródło:
Acta Physica Polonica A; 2011, 120, 5; 865-867
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 25

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