In-situ characterization of qubit drive-phase distortions

• URL: http://arxiv.org/abs/2309.14703v2
• Date: Thu, 22 Aug 2024 11:24:27 GMT
• Title: In-situ characterization of qubit drive-phase distortions
• Abstract summary: We demonstrate a method to detect and compensate for amplitude-dependent phase changes using the qubit itself as a probe. The technique is implemented using a microwave-driven trapped ion qubit, where correcting phase distortions leads to a three-fold improvement in single-qubit gate error.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Reducing errors in quantum gates is critical to the development of quantum computers. To do so, any distortions in the control signals should be identified, however, conventional tools are not always applicable when part of the system is under high vacuum, cryogenic, or microscopic. Here, we demonstrate a method to detect and compensate for amplitude-dependent phase changes, using the qubit itself as a probe. The technique is implemented using a microwave-driven trapped ion qubit, where correcting phase distortions leads to a three-fold improvement in single-qubit gate error, to attain state-of-the-art performance benchmarked at $1.6(4)\times 10^{-6}$ error per Clifford gate.

Related papers

• Digital Predistortion of Optical Fields for Fast and High-Fidelity Entangling Gates in Trapped-Ion Qubits [0.0]
  We show digital predistortion of an acousto-optic modulator used to generate entangling-gate waveforms in a trapped-ion processor.<n>We apply a feed-forward correction that extends its linear operating range and suppresses spurious intermodulation products.
  arXiv  Detail & Related papers  (2026-03-29T16:44:22Z)
• Echo Cross Resonance gate error budgeting on a superconducting quantum processor [0.0]
  We present an error budgeting procedure for the native two-qubit operation on a 32-qubit superconducting-qubit-based quantum computer.<n>An average reduction of 3.7x in error rate for two qubit operations is shown across a chain of 16 qubits.<n>The largest improvements are seen on previously under-performing qubit pairs.
  arXiv  Detail & Related papers  (2026-01-28T10:31:35Z)
• High-fidelity gates in a transmon using bath engineering for passive leakage reset [65.46249968484794]
  Leakage, the occupation of any state not used in the computation, is one of the most devastating errors in quantum error correction. We demonstrate a device which reduces the lifetimes of the leakage states in the transmon by three orders of magnitude.
  arXiv  Detail & Related papers  (2024-11-06T18:28:49Z)
• Reducing leakage of single-qubit gates for superconducting quantum processors using analytical control pulse envelopes [32.40219976663139]
  Fast logic gates lead to increased leakage errors in superconducting quantum processors based on qubits with low anharmonicity, such as transmons. We propose and experimentally demonstrate two new analytical methods, Fourier ansatz spectrum tuning derivative removal by adiabatic gate (FAST DRAG) and higher-derivative (HD) DRAG, to reduce leakage errors.
  arXiv  Detail & Related papers  (2024-02-27T18:48:08Z)
• 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)
• Model-based Optimization of Superconducting Qubit Readout [59.992881941624965]
  We demonstrate model-based readout optimization for superconducting qubits. We observe 1.5% error per qubit with a 500ns end-to-end duration and minimal excess reset error from residual resonator photons. This technique can scale to hundreds of qubits and be used to enhance the performance of error-correcting codes and near-term applications.
  arXiv  Detail & Related papers  (2023-08-03T23:30:56Z)
• 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)
• 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)
• Quantum Circuit Engineering for Correcting Coherent Noise [1.0965065178451106]
  Crosstalk and several sources of operational interference are invisible when qubit or a gate is calibrated or benchmarked in isolation. Unwanted Z-Z coupling on superconducting cross-resonance CNOT gates, is a commonly occurring unitary crosstalk noise. Experiments aggressively deploy forced commutation of CNOT gates to obtain low noise state-preparation circuits.
  arXiv  Detail & Related papers  (2021-09-08T10:33:18Z)
• Measurement-Free Ultrafast Quantum Error Correction by Using Multi-Controlled Gates in Higher-Dimensional State Space [0.5937476291232802]
  We propose a new approach to real-time error correction that is free from measurement and realized by using multi-controlled gates. We provide a series of novel decompositions of a Toffoli gate by using the lowest three energy levels of a transmon. It would substantially shorten the time required for error correction and resetting ancilla qubits.
  arXiv  Detail & Related papers  (2021-08-31T21:44:14Z)
• 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)
• Fault-Tolerant Operation of a Quantum Error-Correction Code [1.835073691235972]
  Quantum error correction protects fragile quantum information by encoding it into a larger quantum system. Fault-tolerant circuits contain the spread of errors while operating the logical qubit. We show that fault-tolerant circuits enable highly accurate logical primitives in current quantum systems.
  arXiv  Detail & Related papers  (2020-09-24T04:31:38Z)

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.