Simultaneous suppression of spontaneous emission and thermal effect in two-level trapped ion system

Zhong-Jie Wang, Chao-Yang Fan
2012 The Journal of Atomic and Molecular Sciences  
We have proposed a method to suppress simultaneously decoherence induced by spontaneous emission and thermal effect in a single two-level trapped ion system based on bang-bang scheme. The basic idea of this method is that two kinds of decoherences are both suppressed by using a series of large detuned pulses to drive the ion in a precision-designed manner, thus best results can be obtained with minimal resources. PACS : 03.65.Yz, 03.67.Pp, 42.50.Lc Key words: decoherence, spontaneous emission,
more » ... ntaneous emission, thermal effect, trapped ions ½¼ ½½ 1 Introduction ½¾ Recently quantum dynamics of trapped ions system has investigated extensively not only be-½¿ cause it is of fundamental interest in quantum optics [1, 2] but also because it plays very ½ important role in quantum computation [3]. Quantum computers have powerful potential ½ of parallel computation. However, an obvious obstacle of physical realization of quantum ½ computer is decoherence. Docoherence of quantum systems generally results from their en-½ tanglement with environment. Due to decoherence, quantum linear superposition states will ½ be degenerated into their mixed states. To overcome decoherence, many different strate-½ gies have been proposed such as. quantum error-correcting codes (QECC) [4-7], quantum ¾¼ error-avoiding codes (QEAC) [8-11], bang-bang control [12]. The bang-bang controlling ¾½ scheme, which is also termed as dynamical decoupling scheme, is a very useful and effective ¾¾ method in inhibiting decoherence. So far many dynamical decoupling schemes have been ¾¿ proposed such as periodic dynamical decoupling(PDD) [13], concatenated dynamical decou-¾
doi:10.4208/jams.010811.021011a fatcat:p26353dhzza23owryn5iytvipe