Universal relations connect asymptotic equal-time spin correlations, dynamical structure factor, and contact density in long-range quantum spin chains via effective field theory and operator product expansion, with numerical verification.
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Proposes a cavity-based single-atom quantum repeater protocol claiming secret key rates of a few to hundreds of Hz over 1000 km via 10-atom multiplexing.
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Universal Relations in Long-range Quantum Spin Chains
Universal relations connect asymptotic equal-time spin correlations, dynamical structure factor, and contact density in long-range quantum spin chains via effective field theory and operator product expansion, with numerical verification.
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Efficient Quantum Repeater with Single Atoms in Cavities
Proposes a cavity-based single-atom quantum repeater protocol claiming secret key rates of a few to hundreds of Hz over 1000 km via 10-atom multiplexing.