Fast-feedback protocols for calibration and drift control in quantum computers

• URL: http://arxiv.org/abs/2512.07815v1
• Date: Mon, 08 Dec 2025 18:47:58 GMT
• Title: Fast-feedback protocols for calibration and drift control in quantum computers
• Authors: Alicia B. Magann, Nathan E. Miller, Robin Blume-Kohout, Peter Maunz, Kevin C. Young,
• Abstract summary: We introduce two classes of lightweight, adaptive calibration protocols for quantum computers.<n>The first enables shot-by-shot updates to device parameters using measurement outcomes from simple, indefinite-outcome quantum circuits.<n>The second protocol updates parameters after collecting measurements from definite-outcome circuits.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We introduce two classes of lightweight, adaptive calibration protocols for quantum computers that leverage fast feedback. The first enables shot-by-shot updates to device parameters using measurement outcomes from simple, indefinite-outcome quantum circuits. This low-latency approach supports rapid tuning of one or more parameters in real time to mitigate drift. The second protocol updates parameters after collecting measurements from definite-outcome circuits (e.g.~syndrome extraction circuits for quantum error correction), balancing efficiency with classical control overheads. We use numerical simulations to demonstrate that both methods can calibrate 1- and 2-qubit gates rapidly and accurately even in the presence of decoherence, state preparation and measurement (SPAM) errors, and parameter drift. We propose and demonstrate effective adaptive strategies for tuning the hyperparameters of both protocols. Finally, we demonstrate the feasibility of real-time in-situ calibration of qubits performing quantum error correction, using only syndrome data, via numerical simulations of syndrome extraction in the [[5,1,3]] code.

Related papers

• Reinforcement Learning Control of Quantum Error Correction [108.70420561323692]
  Quantum computer learns to self-improve directly from its errors and never stops computing.<n>This work enables a new paradigm: a quantum computer that learns to self-improve directly from its errors and never stops computing.
  arXiv  Detail & Related papers  (2025-11-11T17:32:25Z)
• Practical Advantage of Classical Communication in Entanglement Detection [3.3058905316005744]
  Entanglement is the cornerstone of quantum communication, yet conventional detection relies solely on local measurements.<n>We present a unified theoretical and experimental framework demonstrating that one-way local operations and classical communication (1-LOCC) can significantly outperform purely local measurements in detecting high-dimensional quantum entanglement.
  arXiv  Detail & Related papers  (2025-04-14T01:33:20Z)
• Efficient Qubit Calibration by Binary-Search Hamiltonian Tracking [18.54622697112264]
  We present and experimentally implement a real-time protocol for calibrating the frequency of a resonantly driven qubit.<n>We show the efficacy of the algorithm by stabilizing a flux-tunable transmon qubit, leading to improved coherence and gate fidelity.
  arXiv  Detail & Related papers  (2025-01-09T17:18:38Z)
• 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)
• Compilation of a simple chemistry application to quantum error correction primitives [44.99833362998488]
  We estimate the resources required to fault-tolerantly perform quantum phase estimation on a minimal chemical example. We find that implementing even a simple chemistry circuit requires 1,000 qubits and 2,300 quantum error correction rounds.
  arXiv  Detail & Related papers  (2023-07-06T18:00:10Z)
• Minimizing readout-induced noise for early fault-tolerant quantum computers [0.0]
  We present a different method for syndrome extraction, namely Generalized Syndrome Measurement. We can detect the error in the logical state with minimized readout-induced noise. We numerically analyze the performance of our protocol using Iceberg code and Steane code.
  arXiv  Detail & Related papers  (2023-04-23T04:16:26Z)
• Benchmarking multi-qubit gates -- I: Metrological aspects [0.0]
  benchmarking hardware errors in quantum computers has drawn significant attention lately. Existing benchmarks for digital quantum computers involve averaging the global fidelity over a large set of quantum circuits. We develop a new figure-of-merit suitable for multi-qubit quantum gates based on the reduced Choi matrix.
  arXiv  Detail & Related papers  (2022-10-09T19:36:21Z)
• Data post-processing for the one-way heterodyne protocol under composable finite-size security [62.997667081978825]
  We study the performance of a practical continuous-variable (CV) quantum key distribution protocol. We focus on the Gaussian-modulated coherent-state protocol with heterodyne detection in a high signal-to-noise ratio regime. This allows us to study the performance for practical implementations of the protocol and optimize the parameters connected to the steps above.
  arXiv  Detail & Related papers  (2022-05-20T12:37:09Z)
• Experimental Bayesian calibration of trapped ion entangling operations [48.43720700248091]
  We develop and characterize an efficient calibration protocol to automatically estimate and adjust experimental parameters of the widely used Molmer-Sorensen entangling gate operation. We experimentally demonstrate a median gate infidelity of $1.3(1)cdot10-3$, requiring only $1200pm500$ experimental cycles, while completing the entire gate calibration procedure in less than one minute.
  arXiv  Detail & Related papers  (2021-12-02T16:59:00Z)
• Performance of teleportation-based error correction circuits for bosonic codes with noisy measurements [58.720142291102135]
  We analyze the error-correction capabilities of rotation-symmetric codes using a teleportation-based error-correction circuit. We find that with the currently achievable measurement efficiencies in microwave optics, bosonic rotation codes undergo a substantial decrease in their break-even potential.
  arXiv  Detail & Related papers  (2021-08-02T16:12:13Z)
• 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)

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.