Mitigation of Measurement-Induced State Transitions via a Fast-Load and Fast-Clear Readout

• URL: http://arxiv.org/abs/2607.23681v1
• Date: Sun, 26 Jul 2026 14:28:49 GMT
• Title: Mitigation of Measurement-Induced State Transitions via a Fast-Load and Fast-Clear Readout
• Abstract summary: High-fidelity and rapid qubit readout is essential for superconducting quantum processors.<n>We show that a simple three-step pulse scheme consistently minimizes overall readout errors.
• Score: 1.0204876339760183
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: High-fidelity and rapid qubit readout is essential for superconducting quantum processors, typically realized through the quantum non-demolition (QND) dispersive interaction within a qubit-resonator architecture. However, the achievable readout speed and fidelity are fundamentally limited by measurement-induced state transitions (MIST). For a transmon qubit, MIST is highly sensitive to the offset charge $n_g$ due to the charge dispersion of its higher-lying energy levels. In this work, we systematically investigate $n_g$-dependent MIST dynamics governed by the diabaticity and symmetry of pulse shaping within a charge-sensitive transmon architecture. We engineer fast-load and fast-clear pulses that effectively suppress resonator photon overshoots, thereby demonstrating a highly practical strategy to mitigate MIST without requiring complex waveforms or real-time feedback. Utilizing active gate-voltage control and rapid feedback, the measurement-induced transition probability is precisely mapped against $n_g$ and the steady-state resonator photon number, exhibiting strong agreement with numerical Floquet branch analysis. Ultimately, we evaluate the $n_g$-averaged total error probabilities for both readout and post-readout stages, verifying that a straightforward three-step pulse scheme consistently minimizes overall readout errors. Within the framework of large-scale superconducting quantum processors, this practical, hardware-free approach inherently offers a better trade-off between the readout signal-to-noise ratio and QND preservation.

Related papers

• Bang-bang protocol for nondispersive qubit readout [2.8621162328602723]
  Fast, precise, and quantum-non-demolition (QND) readout of superconducting qubits is a fundamental component of high-fidelity quantum sensing and computation.<n>In this work, we study a nondispersive readout protocol that replaces these sweeps by sudden quenches of the coupling constant.<n>We call this protocol bang-bang readout, and show that it realizes single-shot projective measurements.
  arXiv  Detail & Related papers  (2026-08-24T18:00:01Z)
• Counterdiabatic Raman Atom Optics for Compact High-Sensitivity Gravimetry [0.7963756224670789]
  Large-momentum-transfer (LMT) atom interferometry provides a route toward enhanced inertial sensitivity in compact quantum sensors.<n>We investigate theoretically the use of stimulated Raman shortcut-to-adiabatic passage (STIRSAP) for high-fidelity LMT atom optics in a Mach--Zehnder interferometer geometry.
  arXiv  Detail & Related papers  (2026-06-15T16:45:23Z)
• Mitigating Measurement Crosstalk via Pulse Shaping [18.932390565177123]
  We introduce a pulse shaping technique inspired by the derivative removal by adiabatic gate (DRAG) protocol to suppress measurement crosstalk during fast readout.<n>By engineering a spectral notch at neighboring resonator frequencies, the method effectively mitigates spurious signal interference.
  arXiv  Detail & Related papers  (2025-09-05T18:42:35Z)
• Floquet-engineered fast SNAP gates in weakly coupled circuit-QED systems [35.47678727832216]
  We propose a protocol to achieve high-fidelity SNAP gates that are orders of magnitude faster than the standard implementation.<n>We also present a unified theory that explains both the gate acceleration and the associated benign drive-induced decoherence.<n>These results pave the way for the experimental realization of high-fidelity, selective control of weakly coupled, high-coherence cavities.
  arXiv  Detail & Related papers  (2025-06-03T16:18:43Z)
• A Linear Quantum Coupler for Clean Bosonic Control [40.363378379378524]
  An ideal quantum nonlinearity would selectively activate desired coherent processes at high strength.<n>The wide bandwidth of the Josephson nonlinearity makes this difficult, with undesired drive-induced transitions and decoherence limiting qubit readout, gates, couplers and amplifiers.<n>We propose a novel mixer that combines both these strengths, with engineered selection rules that make it essentially linear (not just Kerr-free) when idle, and activate clean parametric processes even when driven at high strength.
  arXiv  Detail & Related papers  (2025-01-29T22:26:14Z)
• Quantum geometric protocols for fast high-fidelity adiabatic state transfer [0.0]
  We develop a framework for optimal control based on the quantum metric tensor. This framework allows for fast and high-fidelity adiabatic pulses, even for a dense energy spectrum. We show that for the geometric protocol, the transfer fidelites are lower bounded $F>99%$ for ultrafast 20 ns pulses.
  arXiv  Detail & Related papers  (2024-09-04T21:14:32Z)
• Enhancing Dispersive Readout of Superconducting Qubits Through Dynamic Control of the Dispersive Shift: Experiment and Theory [47.00474212574662]
  A superconducting qubit is coupled to a large-bandwidth readout resonator. We show a beyond-state-of-the-art two-state-readout error of only 0.25,%$ in 100 ns integration time. The presented results are expected to further boost the performance of new and existing algorithms and protocols.
  arXiv  Detail & Related papers  (2023-07-15T10:30:10Z)
• Pulse-controlled qubit in semiconductor double quantum dots [57.916342809977785]
  We present a numerically-optimized multipulse framework for the quantum control of a single-electron charge qubit. A novel control scheme manipulates the qubit adiabatically, while also retaining high speed and ability to perform a general single-qubit rotation.
  arXiv  Detail & Related papers  (2023-03-08T19:00:02Z)
• 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)
• Monitoring fast superconducting qubit dynamics using a neural network [0.0]
  Weak measurements of a superconducting qubit produce noisy voltage signals that are weakly correlated with the qubit state. Traditional methods require slow qubit dynamics and substantial prior information in the form of calibration experiments. Here, we experimentally demonstrate an alternative method for accurately tracking rapidly driven superconducting qubit trajectories.
  arXiv  Detail & Related papers  (2021-08-26T20:25:31Z)
• Fast high-fidelity single-qubit gates for flip-flop qubits in silicon [68.8204255655161]
  flip-flop qubit is encoded in the states with antiparallel donor-bound electron and donor nuclear spins in silicon. We study the multilevel system that is formed by the interacting electron and nuclear spins. We propose an optimal control scheme that produces fast and robust single-qubit gates in the presence of low-frequency noise.
  arXiv  Detail & Related papers  (2021-01-27T18:37:30Z)

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.