PreprintCC BY-NC-ND 4.0arXiv
Entangling Atomic Quantum Memories Using High-Order Modulated Coherent States
Abstract
High-order coherent-state modulation and collective midpoint measurements enable multi-ebit entanglement distribution between cavity-coupled atomic memories. An SRM-inspired 16-QAM receiver achieves $1.75$ ebits per network mode use at $0.5$~dB end-to-end loss, exceeding single-qubit-per-mode benchmarks by $5.8$~dB and lying $3.8$~dB below the half-link capacity bound. The advantage persists for per-interface loss below $0.2$~dB and calibrated phase errors below 0.2π. For 4-QAM, an optimized POVM with twice as many outcomes raises the achievable rate by 4.0%, revealing measurement-design headroom.
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BibTeX
@misc{cui2026entangling,
title = {{Entangling Atomic Quantum Memories Using High-Order Modulated Coherent States}},
author = {Chaohan Cui and Prajit Dhara and Saikat Guha},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2609.38804},
eprint = {2609.38804},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.38804},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Entangling Atomic Quantum Memories Using High-Order Modulated Coherent States
AU - Chaohan Cui
AU - Prajit Dhara
AU - Saikat Guha
PY - 2026
DA - 2026/10/01
PB - arXiv
DO - 10.48550/arxiv.2609.38804
UR - https://arxiv.org/abs/2609.38804
AB - High-order coherent-state modulation and collective midpoint measurements enable multi-ebit entanglement distribution between cavity-coupled atomic memories. An SRM-inspired 16-QAM receiver achieves $1.75$ ebits per network mode use at $0.5$~dB end-to-end loss, exceeding single-qubit-per-mode benchmarks by $5.8$~dB and lying $3.8$~dB below the half-link capacity bound. The advantage persists for per-interface loss below $0.2$~dB and calibrated phase errors below 0.2π. For 4-QAM, an optimized POVM with twice as many outcomes raises the achievable rate by 4.0%, revealing measurement-design headroom.
ER -