Fast single-atom preparation in optical tweezers via Rydberg blockade

• URL: http://arxiv.org/abs/2606.03922v1
• Date: Tue, 02 Jun 2026 17:13:52 GMT
• Title: Fast single-atom preparation in optical tweezers via Rydberg blockade
• Abstract summary: We propose and demonstrate a scheme for selectively removing one atom at a time from multiply occupied tweezers on a microsecond timescale.<n>With two-photon Rydberg excitation from the ground state, we reduce multi-atom probability to 1% in 64.8 $$s, while retaining single atoms in 58.2(2)% of the tweezers.
• Score: 0.6889859055900734
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Continuously replenished optical tweezer arrays will unlock unlimited-depth quantum circuits with neutral atom qubits. A key bottleneck limiting the cycle time of these systems is removing atoms from tweezers initially loaded with more than one atom. In the conventional technique of light-assisted collisions, slow collisional dynamics limit the timescale for removing excess atoms to several milliseconds. Here, we propose and demonstrate a scheme for selectively removing one atom at a time from multiply occupied tweezers on a microsecond timescale, using intra-tweezer Rydberg blockade and autoionization. We demonstrate the protocol in $^{171}$Yb in two complementary regimes. With two-photon Rydberg excitation from the ground state, we reduce multi-atom probability to 1% in 64.8 $μ$s, while retaining single atoms in 58.2(2)% of the tweezers, which is comparable to the filling fraction achieved with light-assisted collisions under the same experimental conditions, but over two orders of magnitude faster. With single-photon excitation from the metastable state $^3P_0$, reduced single-atom loss enables a higher filling fraction of 74.8(3)%, at the cost of additional temporal overhead to prepare the atoms in $^3P_0$. The final filling fraction is limited by an unexplained two-body loss mechanism, which, if solved, could enable fast, quasi-deterministic loading.

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