Characterization of Coherent Errors in Noisy Quantum Devices

• URL: http://arxiv.org/abs/2307.08741v1
• Date: Mon, 17 Jul 2023 18:00:02 GMT
• Title: Characterization of Coherent Errors in Noisy Quantum Devices
• Authors: Noah Kaufmann, Ivan Rojkov, Florentin Reiter
• Abstract summary: State-of-the-art characterization protocols often focus on incoherent noise and eliminate coherent errors when using Pauli or Clifford twirling techniques. We motivate the extension of an incoherent local Pauli noise model to coherent errors and present a practical characterization protocol for an arbitrary gate layer.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Characterization of quantum devices generates insights into their sources of disturbances. State-of-the-art characterization protocols often focus on incoherent noise and eliminate coherent errors when using Pauli or Clifford twirling techniques. This approach biases the structure of the effective noise and adds a circuit and sampling overhead. We motivate the extension of an incoherent local Pauli noise model to coherent errors and present a practical characterization protocol for an arbitrary gate layer. We demonstrate our protocol on a superconducting hardware platform and identify the leading coherent errors. To verify the characterized noise structure, we mitigate its coherent and incoherent components using a gate-level coherent noise mitigation scheme in conjunction with probabilistic error cancellation. The proposed characterization procedure opens up possibilities for device calibration, hardware development, and improvement of error mitigation and correction techniques.

Related papers

• Benchmarking Single-Qubit Gates on a Noise-Biased Qubit Beyond the Fault-Tolerant Threshold [1.4812736095876513]
  Noise in quantum system hinders the advancement of quantum information processing. One of the most promising platforms to achieve fault-tolerance is qubits with structured noise.
  arXiv  Detail & Related papers  (2024-11-07T05:34:18Z)
• Detrimental non-Markovian errors for surface code memory [0.5490714603843316]
  We study the structure of non-Markovian correlated errors and their impact on surface code memory performance. Our analysis shows that while not all temporally correlated structures are detrimental, certain structures, particularly multi-time "streaky" correlations, can severely degrade logical error rate scaling.
  arXiv  Detail & Related papers  (2024-10-31T09:52:21Z)
• Fault-tolerant quantum architectures based on erasure qubits [49.227671756557946]
  We exploit the idea of erasure qubits, relying on an efficient conversion of the dominant noise into erasures at known locations. We propose and optimize QEC schemes based on erasure qubits and the recently-introduced Floquet codes. Our results demonstrate that, despite being slightly more complex, QEC schemes based on erasure qubits can significantly outperform standard approaches.
  arXiv  Detail & Related papers  (2023-12-21T17:40:18Z)
• Quantum state engineering by steering in the presence of errors [1.2642388972233845]
  We study a class of measurement-based state engineering protocols. We show that the protocol remains fully robust against the erroneous choice of system-detector coupling parameters. We also demonstrate the commutation between the classical expectation value and the time-ordering operator of the exponential of a Hamiltonian with multiplicative white noise.
  arXiv  Detail & Related papers  (2023-03-28T22:07:52Z)
• Characterizing non-Markovian Off-Resonant Errors in Quantum Gates [0.11249583407496219]
  We describe a class of coherent non-Markovian errors -- excitations due to an off-resonant drive. Off-resonant excitations potentially limit any architectures that use frequency selectivity.
  arXiv  Detail & Related papers  (2023-02-21T18:55:24Z)
• Error Mitigation Thresholds in Noisy Random Quantum Circuits [0.30723404270319693]
  We study the robustness of probabilistic error cancellation and tensor network error mitigation when the noise is imperfectly characterized. For one-dimensional circuits, error mitigation fails at an $mathcalO(1)$ time for any imperfection in the characterization of disorder. We discuss further implications for tests of quantum computational advantage, fault-tolerant probes of measurement-induced phase transitions, and quantum algorithms in near-term devices.
  arXiv  Detail & Related papers  (2023-02-08T19:00:01Z)
• Improve Noise Tolerance of Robust Loss via Noise-Awareness [60.34670515595074]
  We propose a meta-learning method which is capable of adaptively learning a hyper parameter prediction function, called Noise-Aware-Robust-Loss-Adjuster (NARL-Adjuster for brevity) Four SOTA robust loss functions are attempted to be integrated with our algorithm, and comprehensive experiments substantiate the general availability and effectiveness of the proposed method in both its noise tolerance and performance.
  arXiv  Detail & Related papers  (2023-01-18T04:54:58Z)
• 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)
• Crosstalk Suppression for Fault-tolerant Quantum Error Correction with Trapped Ions [62.997667081978825]
  We present a study of crosstalk errors in a quantum-computing architecture based on a single string of ions confined by a radio-frequency trap, and manipulated by individually-addressed laser beams. This type of errors affects spectator qubits that, ideally, should remain unaltered during the application of single- and two-qubit quantum gates addressed at a different set of active qubits. We microscopically model crosstalk errors from first principles and present a detailed study showing the importance of using a coherent vs incoherent error modelling and, moreover, discuss strategies to actively suppress this crosstalk at the gate level.
  arXiv  Detail & Related papers  (2020-12-21T14:20:40Z)
• Entanglement-assisted entanglement purification [62.997667081978825]
  We present a new class of entanglement-assisted entanglement purification protocols that can generate high-fidelity entanglement from noisy, finite-size ensembles. Our protocols can deal with arbitrary errors, but are best suited for few errors, and work particularly well for decay noise.
  arXiv  Detail & Related papers  (2020-11-13T19:00:05Z)
• 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)

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.