Towards a Realistic Model for Cavity-Enhanced Atomic Frequency Comb Quantum Memories

• URL: http://arxiv.org/abs/2309.10332v2
• Date: Tue, 12 Dec 2023 04:05:19 GMT
• Title: Towards a Realistic Model for Cavity-Enhanced Atomic Frequency Comb Quantum Memories
• Authors: Shahrzad Taherizadegan (1), Jacob H. Davidson (2), Sourabh Kumar (1), Daniel Oblak (1), and Christoph Simon (1) ((1) Department of Physics & Astronomy, Institute for Quantum Science and Technology, University of Calgary, Calgary, Alberta, Canada, (2) QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands)
• Abstract summary: Atomic frequency comb (AFC) quantum memory is a favorable protocol in long distance quantum communication. Putting the AFC inside an asymmetric optical cavity enhances the storage efficiency but makes the measurement of the comb properties challenging. We develop a theoretical model for cavity-enhanced AFC quantum memory that includes the effects of dispersion.
• Score: 1.0197010747159545
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Atomic frequency comb (AFC) quantum memory is a favorable protocol in long distance quantum communication. Putting the AFC inside an asymmetric optical cavity enhances the storage efficiency but makes the measurement of the comb properties challenging. We develop a theoretical model for cavity-enhanced AFC quantum memory that includes the effects of dispersion, and show a close alignment of the model with our own experimental results. Providing semi quantitative agreement for estimating the efficiency and a good description of how the efficiency changes as a function of detuning, it also captures certain qualitative features of the experimental reflectivity. For comparison, we show that a theoretical model without dispersion fails dramatically to predict the correct efficiencies. Our model is a step forward to accurately estimating the created comb properties, such as the optical depth inside the cavity, and so being able to make precise predictions of the performance of the prepared cavity-enhanced AFC quantum memory.

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