In situ mixer calibration for superconducting quantum circuits

• URL: http://arxiv.org/abs/2408.11671v1
• Date: Wed, 21 Aug 2024 14:49:39 GMT
• Title: In situ mixer calibration for superconducting quantum circuits
• Authors: Nan Wu, Jing Lin, Changrong Xie, Zechen Guo, Wenhui Huang, Libo Zhang, Yuxuan Zhou, Xuandong Sun, Jiawei Zhang, Weijie Guo, Xiayu Linpeng, Song Liu, Yang Liu, Wenhui Ren, Ziyu Tao, Ji Jiang, Ji Chu, Jingjing Niu, Youpeng Zhong, Dapeng Yu,
• Abstract summary: We introduce an in situ calibration technique and outcome-focused mixer calibration scheme using superconducting qubits. We experimentally validate the efficacy of this technique by benchmarking single-qubit gate fidelity and qubit coherence time.
• Score: 21.239311757123467
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Mixers play a crucial role in superconducting quantum computing, primarily by facilitating frequency conversion of signals to enable precise control and readout of quantum states. However, imperfections, particularly carrier leakage and unwanted sideband signal, can significantly compromise control fidelity. To mitigate these defects, regular and precise mixer calibrations are indispensable, yet they pose a formidable challenge in large-scale quantum control. Here, we introduce an in situ calibration technique and outcome-focused mixer calibration scheme using superconducting qubits. Our method leverages the qubit's response to imperfect signals, allowing for calibration without modifying the wiring configuration. We experimentally validate the efficacy of this technique by benchmarking single-qubit gate fidelity and qubit coherence time.

Related papers

• High-precision pulse calibration of tunable couplers for high-fidelity two-qubit gates in superconducting quantum processors [25.085187014541432]
  We introduce and experimentally validate a novel pulse calibration scheme that exploits the strong coupling between qubits and couplers. Our method directly measures the short-time and long-time step responses of the coupler flux pulse transient. We demonstrate the efficacy of our method through the implementation of diabatic CZ and iSWAP gates with fidelities of $99.61pm0.04%$ and $99.82pm0.02%$, respectively.
  arXiv  Detail & Related papers  (2024-10-19T08:55:14Z)
• System Characterization of Dispersive Readout in Superconducting Qubits [37.940693612514984]
  We introduce a single protocol to measure the dispersive shift, resonator linewidth, and drive power used in the dispersive readout of superconducting qubits. We find that the resonator linewidth is poorly controlled with a factor of 2 between the maximum and minimum measured values. We also introduce a protocol for measuring the readout system efficiency using the same power levels as are used in typical qubit readout.
  arXiv  Detail & Related papers  (2024-02-01T08:15:16Z)
• Fast Flux-Activated Leakage Reduction for Superconducting Quantum Circuits [84.60542868688235]
  leakage out of the computational subspace arising from the multi-level structure of qubit implementations. We present a resource-efficient universal leakage reduction unit for superconducting qubits using parametric flux modulation. We demonstrate that using the leakage reduction unit in repeated weight-two stabilizer measurements reduces the total number of detected errors in a scalable fashion.
  arXiv  Detail & Related papers  (2023-09-13T16:21:32Z)
• Hamiltonian Phase Error in Resonantly Driven CNOT Gate Above the Fault-Tolerant Threshold [0.0]
  electron spin qubits are a promising platform for scalable quantum processors. A full-fledged quantum computer will need quantum error correction, which requires high-fidelity quantum gates. We demonstrate a simple yet reliable calibration procedure for a high-fidelity controlled-rotation gate in an exchange-always-on Silicon quantum processor.
  arXiv  Detail & Related papers  (2023-07-18T07:44:00Z)
• Measuring NISQ Gate-Based Qubit Stability Using a 1+1 Field Theory and Cycle Benchmarking [50.8020641352841]
  We study coherent errors on a quantum hardware platform using a transverse field Ising model Hamiltonian as a sample user application. We identify inter-day and intra-day qubit calibration drift and the impacts of quantum circuit placement on groups of qubits in different physical locations on the processor. This paper also discusses how these measurements can provide a better understanding of these types of errors and how they may improve efforts to validate the accuracy of quantum computations.
  arXiv  Detail & Related papers  (2022-01-08T23:12:55Z)
• Analytical and experimental study of center line miscalibrations in M\o lmer-S\o rensen gates [51.93099889384597]
  We study a systematic perturbative expansion in miscalibrated parameters of the Molmer-Sorensen entangling gate. We compute the gate evolution operator which allows us to obtain relevant key properties. We verify the predictions from our model by benchmarking them against measurements in a trapped-ion quantum processor.
  arXiv  Detail & Related papers  (2021-12-10T10:56:16Z)
• Dispersive qubit readout with machine learning [0.08399688944263842]
  Open quantum systems can undergo dissipative phase transitions, and their critical behavior can be exploited in sensing applications. A recently introduced measurement protocol uses the parametric (two-photon driven) Kerr resonator's driven-dissipative phase transition to reach single-qubit detection fidelity of 99.9%. We use machine learning-based classification algorithms to extract information from this critical dynamics.
  arXiv  Detail & Related papers  (2021-12-10T04:25:43Z)
• Fault-tolerant parity readout on a shuttling-based trapped-ion quantum computer [64.47265213752996]
  We experimentally demonstrate a fault-tolerant weight-4 parity check measurement scheme. We achieve a flag-conditioned parity measurement single-shot fidelity of 93.2(2)%. The scheme is an essential building block in a broad class of stabilizer quantum error correction protocols.
  arXiv  Detail & Related papers  (2021-07-13T20:08:04Z)
• Calibration of flux crosstalk in large-scale flux-tunable superconducting quantum circuits [0.0]
  Calibrating flux crosstalk is a challenging task when the circuit elements interact strongly. We present a novel approach to flux crosstalk calibration, which is circuit model independent and relies on an iterative process to gradually improve calibration accuracy.
  arXiv  Detail & Related papers  (2021-05-29T19:28:17Z)
• Efficient and robust certification of genuine multipartite entanglement in noisy quantum error correction circuits [58.720142291102135]
  We introduce a conditional witnessing technique to certify genuine multipartite entanglement (GME) We prove that the detection of entanglement in a linear number of bipartitions by a number of measurements scales linearly, suffices to certify GME. We apply our method to the noisy readout of stabilizer operators of the distance-three topological color code and its flag-based fault-tolerant version.
  arXiv  Detail & Related papers  (2020-10-06T18:00:07Z)
• Unsupervised Calibration under Covariate Shift [92.02278658443166]
  We introduce the problem of calibration under domain shift and propose an importance sampling based approach to address it. We evaluate and discuss the efficacy of our method on both real-world datasets and synthetic datasets.
  arXiv  Detail & Related papers  (2020-06-29T21:50:07Z)

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.