Efficient and high-fidelity entanglement in cavity QED without high cooperativity

• URL: http://arxiv.org/abs/2505.02702v1
• Date: Mon, 05 May 2025 14:56:54 GMT
• Title: Efficient and high-fidelity entanglement in cavity QED without high cooperativity
• Authors: Sumit Goswami, Cheng-Hsuan Chien, Neil Sinclair, Brandon Grinkemeyer, Shayne Bennetts, Ying-Cheng Chen, Hsiang-Hua Jen,
• Abstract summary: We propose a simple modification to the state-carving protocol to achieve efficient entanglement generation.<n>High fidelity of 0.999 can be achieved with cavity cooperativity of only 34.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: The so-called state-carving protocol generates high-fidelity entangled states at an atom-cavity interface without requiring high cavity cooperativity. However, this protocol is limited to 50\% efficiency, which restricts its applicability. We propose a simple modification to the state-carving protocol to achieve efficient entanglement generation, with unit probability in principle. Unlike previous two-photon schemes, ours employs only one photon which interacts with the atoms twice - avoiding separate photon detections which causes irrecoverable probability loss. We present a detailed description and performance evaluation of our protocol under non-ideal conditions. High fidelity of 0.999 can be achieved with cavity cooperativity of only 34. Efficient state-carving paves the way for large-scale entanglement generation at cavity-interfaces for modular quantum computing, quantum repeaters and creating arbitrary shaped atomic graph states, essential for one-way quantum computing.

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