Fig. 1. The relative DES (differential energy shift) between cesium hyperfine states and functional relationship with the magnetic field. The blue star indicates the magic magnetic field.

Fig. 2. The experimental setup for the trapping of a single cesium atom in the blue detuned dipole trap.

Fig. 3. (a) Energy scheme for initialization of Zeeman state by optical pumping; (b) the preparation of qubit through two-photon Raman transition. is the intermediate state detuning from the excited state ; (c) two-photon Raman Rabi oscillations on the transition. The red solid line is fits to a Rabi sinc function; (d) two-photon Raman Rabi oscillations on the , F = 4, transition. The oscillation is a fit according to cosine function. Each point is the statistics over 100 shoots.

Fig. 4. The relative DES between states and , solid line is the functional fitting. Inset is the Raman spectrum measured at B = 1.233 Gauss, the relative offset of spectrum is –1.957(4) kHz.

Fig. 5. Experimental results for the coherence time measurements: (a) The Ramsey spectrum. The fitting by gives the coherence time of 11(1) ms; (b) the decay of the amplitude of spin echo signal. The exponential fitting (solid line) gives a coherence time of . Insert is the spin echo signal at evolution time of .