Mean spin direction and spin squeezing in superpositions of spin coherent states

Open Physics ◽  
2007 ◽  
Vol 5 (3) ◽  
Author(s):  
Dong Yan ◽  
Xiaoguang Wang ◽  
Lijun Song ◽  
Zhanguo Zong
Keyword(s):  
Coherent States ◽  
Relative Phase ◽  
Azimuthal Angle ◽  
Spin Squeezing ◽  
Spin Direction ◽  
The Mean ◽  
Mean Spin Direction ◽  
Spin Coherent States

AbstractWe consider the mean spin direction (MSD) of superpositions of two spin coherent states (SCS) | ± μ〉, and superpositions of | μ〉 and | μ*〉 with a relative phase. We find that the azimuthal angle exhibits a π transition for both states when we vary the relative phase. The spin squeezing of the states, and the bosonic counterpart of the mean spin direction are also discussed.

scholarly journals Spin squeezing and entanglement in superposition of nonlinear spin coherent states

2018 ◽  
Vol 2 (5) ◽  
pp. 055001
Author(s):  
Azita Naji ◽  
Mojtaba Jafarpour ◽  
Fatemeh Sammak
Keyword(s):  
Coherent States ◽  
Spin Squeezing ◽  
Spin Coherent States

Coherence and squeezing in Z3 -graded spin coherent states

2014 ◽  
Vol 62 (8) ◽  
pp. 619-625 ◽  
Author(s):  
W.S. Chung
Keyword(s):  
Coherent States ◽  
Spin Coherent States

Nonclassicality of photon-modulated spin coherent states in the Holstein-Primakoff realization

2021 ◽  
Author(s):  
Xiaoyan Zhang ◽  
Jisuo Wang ◽  
Lei Wang ◽  
Xiangguo Meng ◽  
Baolong Liang
Keyword(s):  
Coherent States ◽  
Wigner Distribution ◽  
Hermite Polynomials ◽  
Photon Number ◽  
Spin Ladder ◽  
Bernoulli Distribution ◽  
Ladder Operators ◽  
Spin Number ◽  
Photon Number Distribution ◽  
Spin Coherent States

Abstract Two new photon-modulated spin coherent states (SCSs) are introduced by operating the spin ladder operators J ± on the ordinary SCS in the Holstein-Primakoff realization and the nonclassicality is exhibited via their photon number distribution, second-order correlation function, photocount distribution and negativity of Wigner distribution. Analytical results show that the photocount distribution is a Bernoulli distribution and the Wigner functions are only associated with two-variable Hermite polynomials. Compared with the ordinary SCS, the photon-modulated SCSs exhibit more stronger nonclassicality in certain regions of the photon modulated number k and spin number j, which means that the nonclassicality can be enhanced by selecting suitable parameters.

Quantum metrology with superposition spin coherent states: Insights from Fisher information

2021 ◽  
Vol 104 (5) ◽  
Author(s):  
Yusef Maleki ◽  
Marlan O. Scully ◽  
Aleksei M. Zheltikov
Keyword(s):  
Fisher Information ◽  
Coherent States ◽  
Quantum Metrology ◽  
Spin Coherent States

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.

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