Entanglement evolution of a three-qubit system after interaction with even three-mode nonlinear coherent state

2021 ◽  
Vol 96 (4) ◽  
pp. 045101
Author(s):  
Azam Anbaraki ◽  
Davood Afshar
Keyword(s):  
Coherent State ◽  
Entanglement Evolution ◽  
Qubit System

scholarly journals Phase Analysis on the Error Scaling of Entangled Qubits in a 53-Qubit System

2021 ◽  
Author(s):  
Ching-Ray Chang ◽  
Wei-Jia Huang ◽  
Wei-Chen Chien ◽  
Chien-Hung Cho ◽  
Che-Chun Huang ◽  
...  
Keyword(s):  
Excited States ◽  
Phase Trajectory ◽  
Trajectory Analysis ◽  
Operation Time ◽  
Noisy Environment ◽  
Gate Operation ◽  
Intermediate Scale ◽  
Entanglement Evolution ◽  
Qubit System ◽  
The Impact

Abstract We have studied carefully the behaviors of entangled qubits on the IBM Rochester with various connectivities and under a “noisy” environment. A phase trajectory analysis based on our measurements of the GHZ-like states is performed. Our results point to an important fact that entangled qubits are “protected” against environmental noise by a scaling property that impacts only the weighting of their amplitudes. The reproducibility of most measurements has been confirmed within a reasonably short gate operation time. But there still are a few combinations of qubits that show significant entanglement evolution in the form of transitions between quantum states. The phase trajectory of an entangled evolution, and the impact of the sudden death of GHZ-like states and the revival of newly excited states are analyzed in details. All observed trajectories of entangled qubits arise under the influences of the newly excited states in a “noisy” intermediate-scale quantum (NISQ) computer.

A NEW PARAMETER OF ENTANGLEMENT FOR A QUBIT SYSTEM PLACED INSIDE A DISSIPATIVE CAVITY

2011 ◽  
Vol 09 (04) ◽  
pp. 1091-1100 ◽  
Author(s):  
S. ABDEL-KHALEK ◽  
A.-S. F. OBADA
Keyword(s):  
Sudden Death ◽  
Coherent State ◽  
Fisher Information ◽  
Marginal Distribution ◽  
Single Mode ◽  
Trapped Ion ◽  
Dissipation Effect ◽  
Qubit System ◽  
Quantized Field

The entanglement in a system of a single two-level trapped ion and a single-mode quantized field in a coherent state inside a phase-damped cavity is investigated. Analytic results under certain parametric conditions are obtained, by means of which we analyze the influence of dissipation on the atomic Fisher information and its marginal distribution. An interesting relation between the temporal entanglement sudden birth, sudden death, atomic Fisher information and the dissipation effect is observed.

scholarly journals Entanglement evolution of a two-qubit system with decay beyond the rotating-wave approximation

2009 ◽  
Vol 18 (11) ◽  
pp. 4662-4666 ◽  
Author(s):  
Yang Qing ◽  
Yang Ming ◽  
Li Da-Chuang ◽  
Cao Zhuo-Liang
Keyword(s):  
Entanglement Evolution ◽  
Rotating Wave Approximation ◽  
Wave Approximation ◽  
Qubit System ◽  
Rotating Wave

ENTANGLEMENT DYNAMICS MODULATED BY COUPLING STRENGTH IN CAVITY QED

2008 ◽  
Vol 06 (02) ◽  
pp. 341-346 ◽  
Author(s):  
ZHONG-XIAO MAN ◽  
SU FANG ◽  
YUN-JIE XIA
Keyword(s):  
Energy Transfer ◽  
Sudden Death ◽  
Cavity Qed ◽  
Entanglement Sudden Death ◽  
Entanglement Dynamics ◽  
Entanglement Evolution ◽  
Qubit System ◽  
Coupling Strengths ◽  
Entangled Atoms ◽  
Separate Cavities

We study the dynamics of entanglement for a four-qubit system in cavity QED. Two initially entangled atoms A and B are coupled respectively with spatially separate cavities a and b with coupling strengths gA and gB. We show that when gA ≠ gB, the entanglement will oscillate in the period of entanglement sudden death (ESD) for gA = gB, and the oscillation times are related to the ratios between gA and gB. Also, we show that the coupling strengths have the same effects on the entanglement evolution and energy transfer.

scholarly journals Phase analysis on the error scaling of entangled qubits in a 53-qubit system

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Wei-Jia Huang ◽  
Wei-Chen Chien ◽  
Chien-Hung Cho ◽  
Che-Chun Huang ◽  
Tsung-Wei Huang ◽  
...  
Keyword(s):  
Excited States ◽  
Phase Trajectory ◽  
Trajectory Analysis ◽  
Operation Time ◽  
Noisy Environment ◽  
Gate Operation ◽  
Intermediate Scale ◽  
Entanglement Evolution ◽  
Qubit System ◽  
The Impact

AbstractWe have studied carefully the behaviors of entangled qubits on the IBM Rochester with various connectivities and under a “noisy” environment. A phase trajectory analysis based on our measurements of the GHZ-like states is performed. Our results point to an important fact that entangled qubits are “protected” against environmental noise by a scaling property that impacts only the weighting of their amplitudes. The reproducibility of most measurements has been confirmed within a reasonably short gate operation time. But there still are a few combinations of qubits that show significant entanglement evolution in the form of transitions between quantum states. The phase trajectory of an entangled evolution, and the impact of the sudden death of GHZ-like states and the revival of newly excited states are analyzed in details. All observed trajectories of entangled qubits arise under the influences of the newly excited states in a “noisy” intermediate-scale quantum (NISQ) computer.

scholarly journals TOPOLOGY OF ENTANGLEMENT EVOLUTION OF TWO QUBITS

2012 ◽  
Vol 26 (07) ◽  
pp. 1250054 ◽  
Author(s):  
DONG ZHOU ◽  
GIA-WEI CHERN ◽  
JIANJIA FEI ◽  
ROBERT JOYNT
Keyword(s):  
Sudden Death ◽  
Critical Points ◽  
Polarization Vector ◽  
Entanglement Sudden Death ◽  
Entanglement Evolution ◽  
Separable States ◽  
Qubit System ◽  
Asymptotic Point ◽  
Lower Dimensional

The dynamics of a two-qubit system is considered with the aim of a general categorization of the different ways in which entanglement can disappear in the course of the evolution, e.g., entanglement sudden death. The dynamics is described by the function n(t), where n is the 15-dimensional polarization vector. This representation is particularly useful because the components of n are direct physical observables, there is a meaningful notion of orthogonality, and the concurrence C can be computed for any point in the space. We analyze the topology of the space S of separable states (those having C = 0), and the often lower-dimensional linear dynamical subspace D that is characteristic of a specific physical model. This allows us to give a rigorous characterization of the four possible kinds of entanglement evolution. Which evolution is realized depends on the dimensionality of D and of D∩S, the position of the asymptotic point of the evolution, and whether or not the evolution is "distance-Markovian", a notion we define. We give several examples to illustrate the general principles, and to give a method to compute critical points. We construct a model that shows all four behaviors.

Improvement of Quasi-Optimum Quantum Receiver for 3-PSK Coherent-State Signals

2009 ◽  
Vol 129 (12) ◽  
pp. 2159-2160
Author(s):  
Asami Imaeda ◽  
Masahiro Yoshikawa ◽  
Tsuyoshi Sasaki
Keyword(s):  
Coherent State

Quasi coherent state of the Dirac oscillator

2021 ◽  
Vol 68 (1) ◽  
pp. 56-62
Author(s):  
P. Ghosh ◽  
P. Roy
Keyword(s):  
Coherent State ◽  
Dirac Oscillator
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