Experimental demonstration of light-nuclear spin interface in He-3 via metastability-exchange collisions in multi-pass cell, with projected measurement-induced squeezing rate of 0.52 s^{-1}.
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The authors identify distinct regimes for QND measurement squeezing (short times) and deterministic squeezing (longer times) via the ratio of tensor to vector light shifts, predicting a spin variance of 0.03 in 50 ms for Yb-173.
Proposes using sum-frequency generation-based quantum frequency conversion combined with resonant confinement in ring resonators to bridge broadband flying qubits with narrowband quantum memories for long-range quantum networks.