Non-invasive mid-circuit measurement and reset on atomic qubits

• URL: http://arxiv.org/abs/2504.12538v1
• Date: Thu, 17 Apr 2025 00:02:04 GMT
• Title: Non-invasive mid-circuit measurement and reset on atomic qubits
• Authors: Zuo-Yao Chen, Isabella Goetting, George Toh, Yichao Yu, Mikhail Shalaev, Sagnik Saha, Ashish Kalakuntla, Harriet Bufan Shi, Christopher Monroe, Alexander Kozhanov, Crystal Noel,
• Abstract summary: Mid-circuit measurement and reset of subsets of qubits is a crucial ingredient of quantum error correction and many quantum information applications.<n>We propose and prototype a new scheme for measurement that provides both spatial and spectral isolation by using tightly-focused individual laser beams and narrow atomic transitions.<n>The unique advantage of this scheme is that all operations are applied exclusively to the read-out qubit, with negligible disturbance to the other qubits of the same species and little overhead.
• Score: 31.874825130479174
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Mid-circuit measurement and reset of subsets of qubits is a crucial ingredient of quantum error correction and many quantum information applications. Measurement of atomic qubits is accomplished through resonant fluorescence, which typically disturbs neighboring atoms due to photon scattering. We propose and prototype a new scheme for measurement that provides both spatial and spectral isolation by using tightly-focused individual laser beams and narrow atomic transitions. The unique advantage of this scheme is that all operations are applied exclusively to the read-out qubit, with negligible disturbance to the other qubits of the same species and little overhead. In this letter, we pave the way for non-invasive and high fidelity mid-circuit measurement and demonstrate all key building blocks on a single trapped barium ion.

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