The technique of stimulated Raman adiabatic passage （STIRAP） is used to transfer potassium atoms from the 22p state to the 21p Rydberg state through the intermediate state 22s. The results show that complete populat...The technique of stimulated Raman adiabatic passage （STIRAP） is used to transfer potassium atoms from the 22p state to the 21p Rydberg state through the intermediate state 22s. The results show that complete population transfer is related to pulse duration and overlap, and occurs when the pulse duration and overlap have adequate values. At the same time, population trapping is also formed. Complete population transfer can also occurs when the two-photon resonance condition （△s = △p） is met.展开更多
We study theoretically how to produce and detect the ultracold ground-state Cs2 molecule from Feshbach state. Nu- merical calculations are performed by solving the quantum Liouville equation based on multilevel Bloch ...We study theoretically how to produce and detect the ultracold ground-state Cs2 molecule from Feshbach state. Nu- merical calculations are performed by solving the quantum Liouville equation based on multilevel Bloch model. The producing efficiency reaches 55% and the detecting efficiency is 31%. The producing and detecting efficiencies are closely related to the Rabi frequencies of laser pulses. The decay of relevant electronic and vibrational states obviously reduces the producing and detecting efficiencies.展开更多
Stimulated Raman adiabatic passage(STIRAP)is an important technique to manipulate quantum states in quantum simulation and quantum computation.The transformation fidelity is limited in reality due to experimental impe...Stimulated Raman adiabatic passage(STIRAP)is an important technique to manipulate quantum states in quantum simulation and quantum computation.The transformation fidelity is limited in reality due to experimental imperfections.After systematically calculating the influence of dissipation caused by thermal fluctuations and instantaneous decay of the intermediate state,we find optimized control pulses of Rydberg atom in optical tweezer to increase the STIRAP fidelity via optimal control method.All constraints of currently available control lasers have been taken into account.The transition error can be further depressed when control lasers with shorter rise time and accordingly proper total evolution time are applied.Finally,the robustness of the control pulses with respect to random deviations between the theoretical pulse shape and the implemented ones is also enhanced by additional rounds of optimizations based on ensemble averaged fidelity.展开更多
We report on the efficient creation of a sample of 2.2×10^(4)fermionic polar molecules^(23)Na^(40)K in their rovibrational ground state X^(1)∑^(+)|v=0,J=0>at 247 nK via an intermediate state of the spin-orbit...We report on the efficient creation of a sample of 2.2×10^(4)fermionic polar molecules^(23)Na^(40)K in their rovibrational ground state X^(1)∑^(+)|v=0,J=0>at 247 nK via an intermediate state of the spin-orbit coupled complex B^(1)Π|v=4〉~C^(3)∑^(+)|v=25〉.Compared with the intermediate state of the coupled complex B^(1)Π|v=12〉^(c)^(3)∑^(+)|v=35〉,this intermediate state has the larger Franck-Condon factors for up-and down-leg coupling of stimulated Raman adiabatic passage(STIRAP).We demonstrate this two-photon pathway to the^(23)Na^(40)K ground state molecules and find that the one-way STIRAP transfer efficiency reaches75%.The molecules^(23)Na^(40)K in their rovibrational ground state are an ideal candidate for the quantum simulation and quantum information of ultracold molecules with long-range interaction.展开更多
基金Project sapported by the National Natural Science Foundation of China （Grant No 10574096）.
文摘The technique of stimulated Raman adiabatic passage （STIRAP） is used to transfer potassium atoms from the 22p state to the 21p Rydberg state through the intermediate state 22s. The results show that complete population transfer is related to pulse duration and overlap, and occurs when the pulse duration and overlap have adequate values. At the same time, population trapping is also formed. Complete population transfer can also occurs when the two-photon resonance condition （△s = △p） is met.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.10974024 and 11274056)
文摘We study theoretically how to produce and detect the ultracold ground-state Cs2 molecule from Feshbach state. Nu- merical calculations are performed by solving the quantum Liouville equation based on multilevel Bloch model. The producing efficiency reaches 55% and the detecting efficiency is 31%. The producing and detecting efficiencies are closely related to the Rabi frequencies of laser pulses. The decay of relevant electronic and vibrational states obviously reduces the producing and detecting efficiencies.
基金Project supported by the Natonal Natural Science Foundation of China (Grant No. 11904018)supported by the high performance computing(HPC) resources at Beihang University and the college students’ innovation and entrepreneurship training program
文摘Stimulated Raman adiabatic passage(STIRAP)is an important technique to manipulate quantum states in quantum simulation and quantum computation.The transformation fidelity is limited in reality due to experimental imperfections.After systematically calculating the influence of dissipation caused by thermal fluctuations and instantaneous decay of the intermediate state,we find optimized control pulses of Rydberg atom in optical tweezer to increase the STIRAP fidelity via optimal control method.All constraints of currently available control lasers have been taken into account.The transition error can be further depressed when control lasers with shorter rise time and accordingly proper total evolution time are applied.Finally,the robustness of the control pulses with respect to random deviations between the theoretical pulse shape and the implemented ones is also enhanced by additional rounds of optimizations based on ensemble averaged fidelity.
基金supported by the Science and Technology Innovation 2030-Major Project(Grant No.2021ZD0302003)the National Key Research and Development Program of China(Grant Nos.2022YFA1404101,2021YFA1401700,and 2018YFA0307601)+1 种基金the National Natural Science Foundation of China(Grant Nos.12034011,92065108,11974224,12022406,and 12004229)the Fund for Shanxi 1331 Project Key Subjects Construction,and Tencent(Xplorer Prize)。
文摘We report on the efficient creation of a sample of 2.2×10^(4)fermionic polar molecules^(23)Na^(40)K in their rovibrational ground state X^(1)∑^(+)|v=0,J=0>at 247 nK via an intermediate state of the spin-orbit coupled complex B^(1)Π|v=4〉~C^(3)∑^(+)|v=25〉.Compared with the intermediate state of the coupled complex B^(1)Π|v=12〉^(c)^(3)∑^(+)|v=35〉,this intermediate state has the larger Franck-Condon factors for up-and down-leg coupling of stimulated Raman adiabatic passage(STIRAP).We demonstrate this two-photon pathway to the^(23)Na^(40)K ground state molecules and find that the one-way STIRAP transfer efficiency reaches75%.The molecules^(23)Na^(40)K in their rovibrational ground state are an ideal candidate for the quantum simulation and quantum information of ultracold molecules with long-range interaction.
