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Decoherence of Odd Coherent State in Laser Process under the Action of Linear Resonance Force

阮文斗 RUAN Wen-dou, 卢道明 Lu Daoming

Acta Sinica Quantum OpticaJan 1, 20170 citations

Decoherence of Superposition of Vacuum State and Single-photon State in Diffusion Process Under the Action of Linear Resonance Force

LU Dao-min

The diffusion master equations of density operators under action of linear resonance force were concisely solved by virtue of thermo entangled state representation and the technique of integration within an ordered product of operators.The evolution formula of the field density operator was given,and the Wigner function evolution formula which is in superposition of vacuum state and single-photon state initially was obtained.By numerically calculating the Wigner function was plotted,and the evolution of negative volume of Wigner function with dissipation time was calculated.Through the analysis of the Wigner function,the effect of decoherence on nonclassical property of the state was discussed.Numerical results show that the negativity area size and the depth of negativity of its Wigner function decrease until vanish with dissipation time.In addition,on the other hand,Wigner function can be slipped under the action of linear resonance force.The diffusion master equations of density operators under action of linear resonance force were concisely solved by virtue of thermo entangled state representation and the technique of integration within an ordered product of operators.The evolution formula of the field density operator was given,and the Wigner function evolution formula which is in superposition of vacuum state and single-photon state initially was obtained.By numerically calculating the Wigner function was plotted,and the evolution of negative volume of Wigner function with dissipation time was calculated.Through the analysis of the Wigner function,the effect of decoherence on nonclassical property of the state was discussed.Numerical results show that the negativity area size and the depth of negativity of its Wigner function decrease until vanish with dissipation time.In addition,on the other hand,Wigner function can be slipped under the action of linear resonance force.

ACTA PHOTONICA SINICAJan 1, 20150 citations

Reversal of wave front in four-photon processes under conditions of two-quantum resonance

V. I. Bespalov, Alexander A. Betin, A. I. Dyatlov +4 more

Journal of Experimental and Theoretical PhysicsAug 1, 19803 citations

Explicit solution of diffusion master equation under the action of linear resonance force via the thermal entangled state representation

Fei Yao, Ji‐Suo Wang, Tian-Niu Xu

Using the well-behaved features of the thermal entangled state representation, we solve the diffusion master equation under the action of a linear resonance force, and then obtain the infinitive operator-sum representation of the density operator. This approach may also be effective for treating other master equations. Moreover, we find that the initial pure coherent state evolves into a mixed thermal state after passing through the diffusion process under the action of the linear resonance force.Using the well-behaved features of the thermal entangled state representation, we solve the diffusion master equation under the action of a linear resonance force, and then obtain the infinitive operator-sum representation of the density operator. This approach may also be effective for treating other master equations. Moreover, we find that the initial pure coherent state evolves into a mixed thermal state after passing through the diffusion process under the action of the linear resonance force.

Chinese Physics BJun 25, 20153 citations

Decoherence of photon-subtracted squeezed vacuum state in dissipative channel＊

Xu, Xuexian, Yuan +3 more

中国物理B：英文版Jan 1, 20110 citations

Post-processing with linear optics for improving the quality of single-photon sources

Dominic William Berry, Scheel, S, Casey R. Myers +3 more

Triggered single-photon sources produce the vacuum state with non-negligible probability, but produce a much smaller multiphoton component. It is therefore reasonable to approximate the output of these photon sources as a mixture of the vacuum and single-photon states. We show that it is impossible to increase the probability for a single photon using linear optics and photodetection on fewer than four modes. This impossibility is due to the incoherence of the inputs; if the inputs were pure-state superpositions, it would be possible to obtain a perfect single-photon output. In the more general case, a chain of beam splitters can be used to increase the probability for a single photon, but at the expense of adding an additional multiphoton component. This improvement is robust against detector inefficiencies, but is degraded by dark counts or multiphoton components in the input.Triggered single-photon sources produce the vacuum state with non-negligible probability, but produce a much smaller multiphoton component. It is therefore reasonable to approximate the output of these photon sources as a mixture of the vacuum and single-photon states. We show that it is impossible to increase the probability for a single photon using linear optics and photodetection on fewer than four modes. This impossibility is due to the incoherence of the inputs; if the inputs were pure-state superpositions, it would be possible to obtain a perfect single-photon output. In the more general case, a chain of beam splitters can be used to increase the probability for a single photon, but at the expense of adding an additional multiphoton component. This improvement is robust against detector inefficiencies, but is degraded by dark counts or multiphoton components in the input.

Feb 3, 200414 citations

Decoherence of Superposition of Vacuum State and Single-photon State in Diffusion Process Under the Action of Linear Resonance Force

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Decoherence of Superposition of Vacuum State and Single-photon State in Diffusion Process Under the Action of Linear Resonance Force

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