By recording the fluorescence fraction of the cold atoms remaining in the magneto-optical trap （MOT） as a function of the release time, the release-and-recapture （R＆R） method is utilized to evaluate the effective...By recording the fluorescence fraction of the cold atoms remaining in the magneto-optical trap （MOT） as a function of the release time, the release-and-recapture （R＆R） method is utilized to evaluate the effective temperature of the cold atomic ensemble. We prepare a single atom in a large-magnetic-gradient MOT and then transfer the trapped single atom into a 1064-nm microscopic optical tweezer. The energy of the single atom trapped in the tweezer is further reduced by polarization gradient cooling （PGC） and the effective temperature is evaluated by extending the R-R technique to a single atom tweezer. The typical effective temperature of a single atom in the tweezer is improved from about 105 μK to about 17 μK by applying the optimum PGC phase.展开更多
A single atom in a magneto--optical trap （MOT） with trap size （hundreds of micrometers） can be transferred into an optical microscopic tweezer with a probability of -100%, The ability to transfer a single atom int...A single atom in a magneto--optical trap （MOT） with trap size （hundreds of micrometers） can be transferred into an optical microscopic tweezer with a probability of -100%, The ability to transfer a single atom into two traps back and forth allows us to study the loading process. The loading probability is found to be insensitive to the geometric overlap of the MOT and the tweezer. It is therefore possible to perform simultaneously loading of a single atom into all sites of the tweezer array for many qubits. In particular, we present a simulation of the one-dimensional and two-dimensional arrays of an optical microscopic tweezer. We find the same qualitative behavior for all of the trap parameters.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos.60978017,61078051 and 10974125)the Science Fund for Creative Research Groups of the National Natural Science Foundation of China (Grant No.60821004)the Program for New Century Excellent Talents of Ministry of Education of China (Grant No.NCET-07-0524)
文摘By recording the fluorescence fraction of the cold atoms remaining in the magneto-optical trap （MOT） as a function of the release time, the release-and-recapture （R＆R） method is utilized to evaluate the effective temperature of the cold atomic ensemble. We prepare a single atom in a large-magnetic-gradient MOT and then transfer the trapped single atom into a 1064-nm microscopic optical tweezer. The energy of the single atom trapped in the tweezer is further reduced by polarization gradient cooling （PGC） and the effective temperature is evaluated by extending the R-R technique to a single atom tweezer. The typical effective temperature of a single atom in the tweezer is improved from about 105 μK to about 17 μK by applying the optimum PGC phase.
基金Project supported by the National Major Scientific Research Program of China(Grant No.2012CB921601)the National Natural Science Foundation of China(Grant Nos.61205215,11274213,and 61475091)
文摘A single atom in a magneto--optical trap （MOT） with trap size （hundreds of micrometers） can be transferred into an optical microscopic tweezer with a probability of -100%, The ability to transfer a single atom into two traps back and forth allows us to study the loading process. The loading probability is found to be insensitive to the geometric overlap of the MOT and the tweezer. It is therefore possible to perform simultaneously loading of a single atom into all sites of the tweezer array for many qubits. In particular, we present a simulation of the one-dimensional and two-dimensional arrays of an optical microscopic tweezer. We find the same qualitative behavior for all of the trap parameters.
