Fast, high-fidelity addressed single-qubit gates using efficient composite pulse sequences

• URL: http://arxiv.org/abs/2305.06725v2
• Date: Wed, 20 Sep 2023 09:36:28 GMT
• Title: Fast, high-fidelity addressed single-qubit gates using efficient composite pulse sequences
• Authors: A. D. Leu, M. F. Gely, M. A. Weber, M. C. Smith, D. P. Nadlinger, D. M. Lucas
• Abstract summary: We use electronic microwave control methods to implement addressed single-qubit gates with high speed and fidelity. For a single qubit, we benchmark an error of $1.5$ $times$ $10-6$ per Clifford gate. For two qubits in the same trap zone, we use a spatial microwave field gradient, combined with an efficient 4-pulse scheme.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We use electronic microwave control methods to implement addressed single-qubit gates with high speed and fidelity, for $^{43}\text{Ca}^{+}$ hyperfine "atomic clock" qubits in a cryogenic (100K) surface trap. For a single qubit, we benchmark an error of $1.5$ $\times$ $10^{-6}$ per Clifford gate (implemented using $600~\text{ns}$ $\pi/2$-pulses). For two qubits in the same trap zone (ion separation $5~\mu\text{m}$), we use a spatial microwave field gradient, combined with an efficient 4-pulse scheme, to implement independent addressed gates. Parallel randomized benchmarking on both qubits yields an average error $3.4$ $\times$ $10^{-5}$ per addressed $\pi/2$-gate. The scheme scales theoretically to larger numbers of qubits in a single register.

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