In-situ mid-circuit qubit measurement and reset in a single-species trapped-ion quantum computing system

• URL: http://arxiv.org/abs/2504.12544v2
• Date: Wed, 23 Apr 2025 00:14:14 GMT
• Title: In-situ mid-circuit qubit measurement and reset in a single-species trapped-ion quantum computing system
• Authors: Yichao Yu, Keqin Yan, Debopriyo Biswas, Vivian Ni Zhang, Bahaa Harraz, Crystal Noel, Christopher Monroe, Alexander Kozhanov,
• Abstract summary: We implement in-situ mid-circuit measurement and reset (MCMR) operations on a trapped-ion quantum computing system.<n>We introduce and compare two methods for isolating data qubits from measured qubits.<n>We experimentally demonstrate both methods on a crystal of two $171textrmYb+$ ions.
• Score: 34.82692226532414
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We implement in-situ mid-circuit measurement and reset (MCMR) operations on a trapped-ion quantum computing system by using metastable qubit states in $^{171}\textrm{Yb}^+$ ions. We introduce and compare two methods for isolating data qubits from measured qubits: one shelves the data qubit into the metastable state and the other drives the measured qubit to the metastable state without disturbing the other qubits. We experimentally demonstrate both methods on a crystal of two $^{171}\textrm{Yb}^+$ ions using both the $S_{1/2}$ ground state hyperfine clock qubit and the $S_{1/2}$-$D_{3/2}$ optical qubit. These MCMR methods result in errors on the data qubit of about $2\%$ without degrading the measurement fidelity. With straightforward reductions in laser noise, these errors can be suppressed to less than $0.1\%$. The demonstrated method allows MCMR to be performed in a single-species ion chain without shuttling or additional qubit-addressing optics, greatly simplifying the architecture.

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