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.

Related papers

• Quantum error correction below the surface code threshold [107.92016014248976]
  Quantum error correction provides a path to reach practical quantum computing by combining multiple physical qubits into a logical qubit. We present two surface code memories operating below a critical threshold: a distance-7 code and a distance-5 code integrated with a real-time decoder. Our results present device performance that, if scaled, could realize the operational requirements of large scale fault-tolerant quantum algorithms.
  arXiv  Detail & Related papers  (2024-08-24T23:08:50Z)
• Robust and fast microwave-driven quantum logic for trapped-ion qubits [0.0]
  Microwave-driven logic is a promising alternative to laser control in scaling trapped-ion based quantum processors. We implement Molmer-Sorensen two-qubit gates on $43textCa+$ hyperfine clock qubits in a cryogenic surface trap, driven by near-field microwaves.
  arXiv  Detail & Related papers  (2024-02-20T12:20:23Z)
• Cat-qubit-inspired gate on cos($2\theta$) qubits [77.34726150561087]
  We introduce a single-qubit $Z$ gate inspired by the noise-bias preserving gate of the Kerr-cat qubit. This scheme relies on a $pi$ rotation in phase space via a beamsplitter-like transformation between a qubit and ancilla qubit.
  arXiv  Detail & Related papers  (2023-04-04T23:06:22Z)
• Error per single-qubit gate below $10^{-4}$ in a superconducting qubit [14.29906536440178]
  We fabric a transmon qubit with long coherence times and demonstrate single-qubit gates with the average gate error below $10-4$. The demonstration extends the upper limit that the average fidelity of single-qubit gates can reach in a transmon-qubit system.
  arXiv  Detail & Related papers  (2023-02-17T04:43:38Z)
• Calibration of Drive Non-Linearity for Arbitrary-Angle Single-Qubit Gates Using Error Amplification [43.97138136532209]
  Non-linearity of qubit drive line components imposes a limit on the fidelity of single-qubit gates. We demonstrate arbitrary-angle single-qubit gates with coherence-limited errors of $2times 10-4$ and leakage below $6times 10-5$.
  arXiv  Detail & Related papers  (2022-12-02T10:34:43Z)
• High fidelity two-qubit gates on fluxoniums using a tunable coupler [47.187609203210705]
  Superconducting fluxonium qubits provide a promising alternative to transmons on the path toward large-scale quantum computing. A major challenge for multi-qubit fluxonium devices is the experimental demonstration of a scalable crosstalk-free multi-qubit architecture. Here, we present a two-qubit fluxonium-based quantum processor with a tunable coupler element.
  arXiv  Detail & Related papers  (2022-03-30T13:44:52Z)
• Unimon qubit [42.83899285555746]
  Superconducting qubits are one of the most promising candidates to implement quantum computers. Here, we introduce and demonstrate a superconducting-qubit type, the unimon, which combines the desired properties of high non-linearity, full insensitivity to dc charge noise, insensitivity to flux noise, and a simple structure consisting only of a single Josephson junction in a resonator.
  arXiv  Detail & Related papers  (2022-03-11T12:57:43Z)
• Random quantum circuits transform local noise into global white noise [118.18170052022323]
  We study the distribution over measurement outcomes of noisy random quantum circuits in the low-fidelity regime. For local noise that is sufficiently weak and unital, correlations (measured by the linear cross-entropy benchmark) between the output distribution $p_textnoisy$ of a generic noisy circuit instance shrink exponentially. If the noise is incoherent, the output distribution approaches the uniform distribution $p_textunif$ at precisely the same rate.
  arXiv  Detail & Related papers  (2021-11-29T19:26:28Z)
• Fast logic with slow qubits: microwave-activated controlled-Z gate on low-frequency fluxoniums [0.0]
  Gate is activated by a $61.6textrmns$ long pulse at the frequency between non-computational transitions. The measured gate error of $(8pm1)times 10-3$ is limited by decoherence in the non-computational subspace.
  arXiv  Detail & Related papers  (2020-11-05T03:25:08Z)
• Demonstration of an All-Microwave Controlled-Phase Gate between Far Detuned Qubits [0.0]
  We present an all-microwave controlled-phase gate between two transversely coupled transmon qubits. Our gate constitutes a promising alternative to present two-qubit gates and could have hardware scaling advantages in large-scale quantum processors.
  arXiv  Detail & Related papers  (2020-06-18T16:08:19Z)
• Universal fast flux control of a coherent, low-frequency qubit [2.5608309213668585]
  New protocols for reset, fast coherent control, and readout are presented. We realize single-qubit gates in $20-60$ns with an average gate fidelity of $99.8%$ as characterized by randomized benchmarking.
  arXiv  Detail & Related papers  (2020-02-25T03:42:09Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.