Open AccessSuppressing phase decoherence of a single atom qubit with Carr-Purcell-Meiboom-Gill sequence
Author(s) -
Yu Shi,
Peng Xu,
Xiaodong He,
Min Liu,
Jin Wang,
Min Zhan
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.032130
Subject(s) - dephasing , quantum decoherence , physics , heteronuclear molecule , coherence (philosophical gambling strategy) , atom (system on chip) , atomic physics , qubit , dipole , phase (matter) , pulse sequence , spin (aerodynamics) , pulse (music) , spin echo , quantum , molecular physics , nuclear magnetic resonance , quantum mechanics , nuclear magnetic resonance spectroscopy , voltage , computer science , thermodynamics , embedded system , medicine , radiology , magnetic resonance imaging
We experimentally demonstrate the strong suppression of dephasing of a qubit stored in a single 87Rb atom in an optical dipole trap by using Carr-Purcell-Meiboom-Gill (CPMG) pulse sequences. Regarded as a repetition of spin echo, CPMG sequence is an excellent choice for suppressing both inhomogeneous and homogeneous phase decoherence mechanisms. In comparison with atomic ensembles, the dephasing due to atomic collisions disappears for individual atoms. Thus, CPMG suppression effect is efficient with a few π-pulses. In our trap with 830 nm wavelength and 0.7 mK potential depth, the reversible inhomogeneous dephasing time is T2*=1.4 ms. We obtain the homogeneous dephasing time of T'2 = 103 ms in the spin echo process. By employing CPMG sequence with pulse number n = 6, the homogeneous dephasing is further suppressed by a factor of 3, and its corresponding coherence time is extended to T'2 = 304 ms.