Trapping and cooling of ions for quantum information processing

Kazuhiro Hayasaka, Satoshi Uetake, Hidetsuka Imajo +3 more

Jinyin Wan, Yuzhu Wang, Liang Liu

Signe Louise Seidelin, John Chiaverini, R. Reichle +13 more

Individual laser-cooled 24Mg+ ions are confined in a linear Paul trap with a novel geometry where gold electrodes are located in a single plane and the ions are trapped 40 microm above this plane. The relatively simple trap design and fabrication procedure are important for large-scale quantum information processing (QIP) using ions. Measured ion motional frequencies are compared to simulations. Measurements of ion recooling after cooling is temporarily suspended yield a heating rate of approximately 5 motional quanta per millisecond for a trap frequency of 2.83 MHz, sufficiently low to be useful for QIP.

万金银, 王育竹, Liu guo Liang

Fei Zhou, Yi Xie, You-Yang Xu +2 more

Strings of laser cooled 40 Ca + crystals have been successfully confined in our home-built linear ion trap, and ready for quantum information processing. We find the cloud-crystal phase transition of the trapped ions to be strongly sensitive to the frequencies of the Doppler cooling lasers and to the trapping voltage. The quantum jump of a single ion has been observed by controlling the quadrupole transition of the ion by a weak laser with ultra-narrow bandwidth.

Christian F. Roos