A new kind of excited even q-coherent states （aq^-1）^m｜α〉q^e and excited odd q-coherent states （aq^-1）^m｜α〉q^o is constructed by acting with inverse boson operators on the even and odd q-coherent states. ...A new kind of excited even q-coherent states （aq^-1）^m｜α〉q^e and excited odd q-coherent states （aq^-1）^m｜α〉q^o is constructed by acting with inverse boson operators on the even and odd q-coherent states. The m dependence of the kth-order antibunching effect is numerically studied for k = 2, 3, 4, 5. It is shown that the kth-order antibunching effect enhances as m increases. The larger k, the quicker the antibunching effect enhances.展开更多
Quantum statistical properties of the binomial field interacting with the two entangled atoms are investi-gated for the different initial conditions.It is found that the sub-Poissonian distribution and the antibunchin...Quantum statistical properties of the binomial field interacting with the two entangled atoms are investi-gated for the different initial conditions.It is found that the sub-Poissonian distribution and the antibunching effect canbe presented for the certain ranges of the involved parameters.展开更多
The quantum features of the temporal photon statistics of an exciton-cavity coupled system in a quantum-well semiconductor microcavity are investigated analytically. Under the secular approximation, if the nonlinear i...The quantum features of the temporal photon statistics of an exciton-cavity coupled system in a quantum-well semiconductor microcavity are investigated analytically. Under the secular approximation, if the nonlinear interactions, i.e. the exciton-exciton coupling and the phase-space filling, are much weaker than the exciton-photon interaction, the evolution of the Fano factor shows that the distribution of the photon numbers exhibits the feature of collapses-revivals （CRs）, and the relevant revival time may be adjusted by several factors such as the total particle number, the detuning, and the nonlinear coupling strengths, etc. Especially, the ideal maximum antibunching with the minimum value 0 of the Fano factor occurs periodically for such a situation, with the dissipation of exciton-polariton being ignored.展开更多
The relation between the excitonic purity and the concurrence in a system of two coupled large semiconduction quantum dots mediated by a single-mode cavity field is investigated by using linear entropy theory. The res...The relation between the excitonic purity and the concurrence in a system of two coupled large semiconduction quantum dots mediated by a single-mode cavity field is investigated by using linear entropy theory. The results show the difference in describing two modes of excitonic entanglement between linear entropy and concurrence. The relation between nonclassical property of cavity field and the entanglement degree of excitons is also discussed. The results show that two modes of exciton can reach maximal entanglement when the cavity exhibits an antibunching effect.展开更多
In this paper, we investigate the distribution statistics of photons in a single mode radiation field subjected to two-photon absorption (TPA) and the factors that contribute to squeezing and antibunching of photons, ...In this paper, we investigate the distribution statistics of photons in a single mode radiation field subjected to two-photon absorption (TPA) and the factors that contribute to squeezing and antibunching of photons, leading to the generation of nonclassical light. TPA is a nonlinear optical phenomenon in which the atoms interact with the light field by absorbing two photons simultaneously. The motivation to study TPA is the recent intense activity on nanocrystallites/quantum dots. Further, it is the only nonlinear optical phenomenon that can be analytically studied. The simultaneous occurrence of squeezing and antibunching is studied with small initial photon numbers by solving the master equation for TPA of a single mode radiation directly by numerical integration, without going through analytical procedure. The results are compared with those of analytical/numerical procedures available. Further, the discussion on the parameters of squeezing and antibunching for short-time (ST) as well as long-time is done comprehensively in the present work by taking up the ST approximation and summation of ST (SST) procedure along with the exact numerical method.展开更多
Ⅰ. INTRODUCTION The squeezed field state, which exhibits fluctuations in one quadrature component of field smaller than those associated with the vacuum state, at the cost of increased fluctuations in the other quadr...Ⅰ. INTRODUCTION The squeezed field state, which exhibits fluctuations in one quadrature component of field smaller than those associated with the vacuum state, at the cost of increased fluctuations in the other quadrature component, is one type of the pure quantum-mechanical states of the radiation field. The state has been extensively studied because of its potential applications in optical communications and weak signal detections since it was introduced by Stoler in 1970.展开更多
Here,we combined the photon antibunching analysis,fluorescence correlation spectroscopy,and time-domain fluorescence lifetime imaging microscopy(TD-FLIM)to study the emission properties of a representative AIE-lumino...Here,we combined the photon antibunching analysis,fluorescence correlation spectroscopy,and time-domain fluorescence lifetime imaging microscopy(TD-FLIM)to study the emission properties of a representative AIE-luminogen—4,4’-(benzo[c][1,2,5]thiadiazole-4,7-diyl)bis(N,N-diphenylaniline)(TPA-BT)at the single emitter level in a tetrahydrofuran(THF)/water solution where water is a non-solvent for TPA-BT.Our findings suggest that,at a constant water fraction in the solution,the size of TPA-BT aggregates increases with the TPA-BT concentration;TPA-BT aggregates are not a quantum emitter at room temperature in the solution.Moreover,utilizing TD-FLIM and a gel trapping technique allowed us to study the fluorescence lifetime of individual TPA-BT aggregates.Adding a polar solvent like water does not result in an overall decrease in fluorescence lifetime.Rather,it causes the fluorescence lifetime distribution to become wider,and only some molecules experience a decrease in their fluorescence lifetime.These results could represent a step forward in further understanding the photophysics of AIE-luminogens.展开更多
文摘A new kind of excited even q-coherent states （aq^-1）^m｜α〉q^e and excited odd q-coherent states （aq^-1）^m｜α〉q^o is constructed by acting with inverse boson operators on the even and odd q-coherent states. The m dependence of the kth-order antibunching effect is numerically studied for k = 2, 3, 4, 5. It is shown that the kth-order antibunching effect enhances as m increases. The larger k, the quicker the antibunching effect enhances.
基金The project supported in part by the Science Foundation of China University of Petroleum under Grant No.Y061815
文摘Quantum statistical properties of the binomial field interacting with the two entangled atoms are investi-gated for the different initial conditions.It is found that the sub-Poissonian distribution and the antibunching effect canbe presented for the certain ranges of the involved parameters.
文摘The quantum features of the temporal photon statistics of an exciton-cavity coupled system in a quantum-well semiconductor microcavity are investigated analytically. Under the secular approximation, if the nonlinear interactions, i.e. the exciton-exciton coupling and the phase-space filling, are much weaker than the exciton-photon interaction, the evolution of the Fano factor shows that the distribution of the photon numbers exhibits the feature of collapses-revivals （CRs）, and the relevant revival time may be adjusted by several factors such as the total particle number, the detuning, and the nonlinear coupling strengths, etc. Especially, the ideal maximum antibunching with the minimum value 0 of the Fano factor occurs periodically for such a situation, with the dissipation of exciton-polariton being ignored.
基金Project supported by the Scientific Research Fund of Education Bureau of Hunan Province (Grant No 05C696)
文摘The relation between the excitonic purity and the concurrence in a system of two coupled large semiconduction quantum dots mediated by a single-mode cavity field is investigated by using linear entropy theory. The results show the difference in describing two modes of excitonic entanglement between linear entropy and concurrence. The relation between nonclassical property of cavity field and the entanglement degree of excitons is also discussed. The results show that two modes of exciton can reach maximal entanglement when the cavity exhibits an antibunching effect.
文摘In this paper, we investigate the distribution statistics of photons in a single mode radiation field subjected to two-photon absorption (TPA) and the factors that contribute to squeezing and antibunching of photons, leading to the generation of nonclassical light. TPA is a nonlinear optical phenomenon in which the atoms interact with the light field by absorbing two photons simultaneously. The motivation to study TPA is the recent intense activity on nanocrystallites/quantum dots. Further, it is the only nonlinear optical phenomenon that can be analytically studied. The simultaneous occurrence of squeezing and antibunching is studied with small initial photon numbers by solving the master equation for TPA of a single mode radiation directly by numerical integration, without going through analytical procedure. The results are compared with those of analytical/numerical procedures available. Further, the discussion on the parameters of squeezing and antibunching for short-time (ST) as well as long-time is done comprehensively in the present work by taking up the ST approximation and summation of ST (SST) procedure along with the exact numerical method.
基金Project supported by the National Natural Science Foundation of China
文摘Ⅰ. INTRODUCTION The squeezed field state, which exhibits fluctuations in one quadrature component of field smaller than those associated with the vacuum state, at the cost of increased fluctuations in the other quadrature component, is one type of the pure quantum-mechanical states of the radiation field. The state has been extensively studied because of its potential applications in optical communications and weak signal detections since it was introduced by Stoler in 1970.
基金Financial support from the National Natural Science Foundation of China(Nos.22073091 and 21873094)National Key ResearchandDevelopmentProgram ofChina(No.2021YFC2101704)+1 种基金International Science and Technology Cooperation Program of Jilin,China(No.20220508126RC)Key Research Program of Frontier Sciences,Chinese Academy of Sciences(No.ZDBS-LY-SLHO33)is gratefully acknowledged。
文摘Here,we combined the photon antibunching analysis,fluorescence correlation spectroscopy,and time-domain fluorescence lifetime imaging microscopy(TD-FLIM)to study the emission properties of a representative AIE-luminogen—4,4’-(benzo[c][1,2,5]thiadiazole-4,7-diyl)bis(N,N-diphenylaniline)(TPA-BT)at the single emitter level in a tetrahydrofuran(THF)/water solution where water is a non-solvent for TPA-BT.Our findings suggest that,at a constant water fraction in the solution,the size of TPA-BT aggregates increases with the TPA-BT concentration;TPA-BT aggregates are not a quantum emitter at room temperature in the solution.Moreover,utilizing TD-FLIM and a gel trapping technique allowed us to study the fluorescence lifetime of individual TPA-BT aggregates.Adding a polar solvent like water does not result in an overall decrease in fluorescence lifetime.Rather,it causes the fluorescence lifetime distribution to become wider,and only some molecules experience a decrease in their fluorescence lifetime.These results could represent a step forward in further understanding the photophysics of AIE-luminogens.
