State detection using coherent Raman repumping and two-color Raman transfers

2011/05/04 by Boon Leng Chuah, Chuah, Boon Leng, Nick C. Lewty +3
Physics and Astronomy · #FOS: Physical sciences #Quantum Physics (quant-ph) #quant-ph

paper · pdf · doi:10.48550/arxiv.1105.0763

arxiv created 2011/05/04 · arxiv updated 2011/05/05

Abstract

We demonstrate state detection based on coherent Raman repumping and a two-color Raman state transfer. The Raman coupling during detection selectively eliminates unwanted dark states in the fluorescence cycle without compromising the immunity of the desired dark state to off-resonant scattering. We demonstrate this technique using ¹³⁷Ba⁺ where a combination of Raman coupling and optical pumping leaves the D_3/2 \ketF"=3,m_F"=3 metastable state optically dark and immune to off-resonant scattering. All other states are strongly coupled to the upper P_1/2 levels. We achieve a single shot state-detection efficiency of 89.6(3)% in a 1ms integration time, limited almost entirely by technical imperfections. Shelving to the \ketF"=3,m_F"=3 state before detection is performed via a two-color Raman transfer with a fidelity of 1.00(3).

Related

• Resonance Raman optical cycling for high-fidelity fluorescence detection of molecules
• Observation of single- and two-photon beating between independent Raman scattering
• Stimulated X-ray Raman scattering for selective preparation of dark states bypassing optical selection rules
• Coherent control of light field with electromagnetically induced transparency in a dark state Raman coherent tripod system
• Parametric beating of a quantum probe field with a prepared Raman coherence in a far-off-resonance medium