scholarly journals Efficient fusion of photonic W-states with nonunitary partial-swap gates

2020 ◽  
Vol 22 (9) ◽  
pp. 093051
Author(s):  
Hai-Rui Wei ◽  
Wen-Qiang Liu ◽  
Leong-Chuan Kwek
Keyword(s):  
W States

scholarly journals One-step direct measurement of the entangled W states with cross-Kerr nonlinearity

2021 ◽  
Author(s):  
Si-Le Lin ◽  
Chun-Lin Zhang ◽  
Si-Yang Hao ◽  
Pei-Yao Hong ◽  
Qiao-Hui Guo
Keyword(s):  
Direct Measurement ◽  
Kerr Nonlinearity ◽  
W States ◽  
One Step

scholarly journals Entropic Steering Criteria: Applications to Bipartite and Tripartite Systems

Entropy ◽  
2018 ◽  
Vol 20 (10) ◽  
pp. 763 ◽  
Author(s):  
Ana Costa ◽  
Roope Uola ◽  
Otfried Gühne
Keyword(s):  
Relative Entropy ◽  
Uncertainty Relation ◽  
Uncertainty Relations ◽  
W States ◽  
Entropic Uncertainty Relations ◽  
Entropic Uncertainty Relation ◽  
Local Measurements ◽  
Action At A Distance ◽  
Quantum Steering ◽  
Joint Convexity

The effect of quantum steering describes a possible action at a distance via local measurements. Whereas many attempts on characterizing steerability have been pursued, answering the question as to whether a given state is steerable or not remains a difficult task. Here, we investigate the applicability of a recently proposed method for building steering criteria from generalized entropic uncertainty relations. This method works for any entropy which satisfy the properties of (i) (pseudo-) additivity for independent distributions; (ii) state independent entropic uncertainty relation (EUR); and (iii) joint convexity of a corresponding relative entropy. Our study extends the former analysis to Tsallis and Rényi entropies on bipartite and tripartite systems. As examples, we investigate the steerability of the three-qubit GHZ and W states.

Generation of large-scale W states in a cavity–quantum dot system

2020 ◽  
Vol 17 (5) ◽  
pp. 055204
Author(s):  
Jun Liu ◽  
Ping Dong ◽  
Li-Hua Zhang ◽  
Zhuo-Liang Cao
Keyword(s):  
Quantum Dot ◽  
Large Scale ◽  
W States

Entanglement criteria for the three-qubit states

2017 ◽  
Vol 15 (07) ◽  
pp. 1750049 ◽  
Author(s):  
Y. Akbari-Kourbolagh
Keyword(s):  
White Noise ◽  
Tensor Products ◽  
W State ◽  
Entangled States ◽  
Mean Values ◽  
W States ◽  
Pauli Matrices ◽  
The Mean ◽  
Simple Sets ◽  
Qubit States

We present sufficient criteria for the entanglement of three-qubit states. For some special families of states, the criteria are also necessary for the entanglement. They are formulated as simple sets of inequalities for the mean values of certain observables defined as tensor products of Pauli matrices. The criteria are good indicators of the entanglement in the vicinity of three-qubit GHZ and W states and enjoy the capability of detecting the entangled states with positive partial transpositions. Furthermore, they improve the best known result for the case of W state mixed with the white noise. The efficiency of the criteria is illustrated through several examples.

Fusion of W states in a cavity quantum electrodynamic system

2015 ◽  
Vol 93 (5) ◽  
pp. 556-560 ◽  
Author(s):  
Xue-Ping Zang ◽  
Ming Yang ◽  
Xian-Cai Wang ◽  
Wei Song ◽  
Zhuo-Liang Cao
Keyword(s):  
Quantum Electrodynamic ◽  
Cavity Mode ◽  
State System ◽  
The Other ◽  
W State ◽  
Feasibility Analysis ◽  
Electrodynamic System ◽  
W States ◽  
Vacuum Cavity

In this paper, we study how to fuse two W states into a larger W state in a cavity quantum electrodynamic system. Two atoms are collided within a detuned vacuum cavity mode. One atom is from the first N-atom W state system, and the other is from the second M-atom W state system. The two atoms will be detected after flying out of the cavity mode. If only one excitation is detected between the two atoms, an (N + M − 2)-atom W state can be generated with some probability. If no excitation is detected between the two atoms, the remaining (N − 1)-atom W state and (M − 1)-atom W state can be re-fused using the same procedure, continuing until two excitations are detected between the two atoms. Using this procedure, the chance of entanglement of the two W states is as large as possible. A feasibility analysis indicates that this scheme can be implemented using existing experimental technologies.

Quantum operation sharing with symmetric and asymmetric W states

2013 ◽  
Vol 12 (7) ◽  
pp. 2453-2464 ◽  
Author(s):  
Qibin Ji ◽  
Yimin Liu ◽  
Xiaofeng Yin ◽  
Xiansong Liu ◽  
Zhanjun Zhang
Keyword(s):  
Quantum Operation ◽  
W States

Efficient Superdense Coding with W States

2018 ◽  
Vol 57 (7) ◽  
pp. 1935-1941 ◽  
Author(s):  
You-Sheng Zhou ◽  
Feng Wang ◽  
Ming-Xing Luo
Keyword(s):  
Superdense Coding ◽  
W States

Qubit-loss-free fusion of W states

2016 ◽  
Vol 94 (6) ◽  
Author(s):  
Ke Li ◽  
Fan-Zhen Kong ◽  
Ming Yang ◽  
Qing Yang ◽  
Zhuo-Liang Cao
Keyword(s):  
W States ◽  
Qubit Loss

scholarly journals Decoherence assisted spin squeezing generation in superposition of tripartite GHZ and W states

2019 ◽  
Vol 198 ◽  
pp. 00015
Author(s):  
Kapil K. Sharma ◽  
Swaroop Ganguly
Keyword(s):  
Spin Squeezing ◽  
Spin Vector ◽  
Amplitude Damping ◽  
W States ◽  
Phase Damping ◽  
The Mean

In the present paper, we study spin squeezing under decoherence in the superposition of tripartite maximally entangled GHZ and W states. Here we use amplitude damping, phase damping and depolarisation channel. We have investigated the dynamics of spin squeezing with the interplay of super-position and decoherence parameters with different directions of the mean spin vector. We have found the mixture of GHZ and W states is robust against spin squeezing generation for amplitude damping and phase damping channels for certain directions of the mean spin vector. However, the depolarisation channel performs well for spin squeezing generation and generates permanent spin squeezing in the superposition of GHZ and W states.

Sign in / Sign up

Export Citation Format

Share Document