Fast Cooling of Trapped Ion in Strong Sideband Coupling Regime

• URL: http://arxiv.org/abs/2011.09613v1
• Date: Thu, 19 Nov 2020 02:01:31 GMT
• Title: Fast Cooling of Trapped Ion in Strong Sideband Coupling Regime
• Authors: Shuo Zhang and Jian-Qi Zhang and Wei Wu and Wan-Su Bao and Chu Guo
• Abstract summary: Trapped ion in the Lamb-Dicke regime with the Lamb-Dicke parameter $etall1$ can be cooled down to its motional ground state using sideband cooling. Standard sideband cooling works in the weak sideband coupling limit, where the sideband coupling strength is small compared to the natural linewidth $gamma$ of the internal excited state. We consider cooling schemes in the strong sideband coupling regime, where the sideband coupling strength is comparable or even greater than $gamma$.
• Score: 9.850203673125119
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Trapped ion in the Lamb-Dicke regime with the Lamb-Dicke parameter $\eta\ll1$ can be cooled down to its motional ground state using sideband cooling. Standard sideband cooling works in the weak sideband coupling limit, where the sideband coupling strength is small compared to the natural linewidth $\gamma$ of the internal excited state, with a cooling rate much less than $\gamma$. Here we consider cooling schemes in the strong sideband coupling regime, where the sideband coupling strength is comparable or even greater than $\gamma$. We derive analytic expressions for the cooling rate and the average occupation of the motional steady state in this regime, based on which we show that one can reach a cooling rate which is proportional to $\gamma$, while at the same time the steady state occupation increases by a correction term proportional to $\eta^{2}$ compared to the weak sideband coupling limit. We demonstrate with numerical simulations that our analytic expressions faithfully recover the exact dynamics in the strong sideband coupling regime.

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