Qubit Loss Inference with Stabilizer Codes without Leakage Detection Units

• URL: http://arxiv.org/abs/2607.29603v1
• Date: Fri, 31 Jul 2026 16:34:49 GMT
• Title: Qubit Loss Inference with Stabilizer Codes without Leakage Detection Units
• Abstract summary: Qubit loss is a major obstacle to fault-tolerant quantum computation on platforms including photonic, neutral-atom, and trapped-ion systems.<n>We investigate whether qubit loss can be inferred from syndrome data obtained through standard repeated stabilizer measurements.<n>We evaluate the resulting inference and loss-correction protocols on the rotated surface code via circuit-level noise simulations for trapped-ion and neutral-atom platforms.
• Score: 2.266162528419571
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Qubit loss occurs when the physical carrier of a qubit leaves the computational system without directly revealing the event's location. Such errors are a major obstacle to fault-tolerant quantum computation on platforms including photonic, neutral-atom, and trapped-ion systems. Loss locations are commonly identified using additional hardware operations such as leakage-detection units (LDUs), which introduce space-time overhead and may themselves become a source of error. We investigate whether qubit loss on stabilizer codes can instead be inferred from syndrome data obtained through standard repeated stabilizer measurements. Under a non-entangling model for gates involving a lost qubit, we derive a sufficient condition for loss detectability in general stabilizer codes. The condition is based on the emergence of anticommutation between stabilizer checks after their support on the lost qubits is removed. By using that condition, we formulate the exact loss-inference problem using the observed set of non-deterministic checks together with its maximum-likelihood formulation. We then relax the problem to the minimum set cover problem with a greedy heuristic algorithm. We evaluate the resulting inference and loss-correction protocols on the rotated surface code via circuit-level noise simulations for trapped-ion and neutral-atom platforms. On both platforms, inference-based and adaptive protocols reduce the logical error rate relative to a noisy-LDU baseline in the low-to-moderate loss-rate regime relevant to near-term hardware, while requiring fewer space-time overheads.

Related papers

• The Gain-Engineered Transmon [68.89136228609398]
  We introduce and experimentally realize a noise-biased qubit in a standard transmon-readout resonator circuit.<n>Our results open a path towards using this system as a simple building-block for hardware-efficient quantum error detection and correction schemes.
  arXiv  Detail & Related papers  (2026-08-26T17:00:42Z)
• When to Skip Syndrome Extraction in Surface-GKP Codes [0.1909808926064466]
  We propose a concrete adaptive skipping scheme for the surface-GKP code.<n>We show that the scheme can reduce the number of surface-code stabilizer measurements while maintaining logical error rates comparable to or lower than those of the full-measurement baseline.
  arXiv  Detail & Related papers  (2026-06-23T12:01:14Z)
• AI-Enabled Decoding of Qubit Loss for Quantum Error-Correcting Codes [16.0178741156376]
  Qubit loss is a major source of error in quantum computation.<n>We develop an artificial-intelligence-enabled decoder based on a Graph Neural Network architecture.
  arXiv  Detail & Related papers  (2026-04-15T17:59:35Z)
• Universal quantum computation via scalable measurement-free error correction [45.29832252085144]
  We show that universal quantum computation can be made fault-tolerant in a scenario where the error-correction is implemented without mid-circuit measurements.<n>We introduce a measurement-free deformation protocol of the Bacon-Shor code to realize a logical $mathitCCZ$ gate.<n>In particular, our findings support that below-breakeven logical performance is achievable with a circuit-level error rate below $10-3$.
  arXiv  Detail & Related papers  (2024-12-19T18:55:44Z)
• Error threshold in active steering protocols for few-qubit systems [0.0]
  We study active steering protocols for weakly measured qubits in the presence of error channels due to amplitude and phase noise.<n>If the error rate is sufficiently small, the protocol approaches and stabilizes a predesignated pure target state with high fidelity and high purity.
  arXiv  Detail & Related papers  (2024-08-20T15:56:39Z)
• 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)
• Low-Depth Flag-Style Syndrome Extraction for Small Quantum Error-Correction Codes [1.2354542488854734]
  Flag-style fault-tolerance has become a linchpin in the realization of small fault-tolerant quantum-error correction experiments. We show that a dynamic choice of stabilizer measurements leads to flag protocols with lower-depth syndrome-extraction circuits. This work opens the dialogue on exploiting the properties of the full stabilizer group for reducing circuit overhead in fault-tolerant quantum-error correction.
  arXiv  Detail & Related papers  (2023-05-01T12:08:09Z)
• 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)
• Quantum error correction with dissipatively stabilized squeezed cat qubits [68.8204255655161]
  We propose and analyze the error correction performance of a dissipatively stabilized squeezed cat qubit. We find that for moderate squeezing the bit-flip error rate gets significantly reduced in comparison with the ordinary cat qubit while leaving the phase flip rate unchanged.
  arXiv  Detail & Related papers  (2022-10-24T16:02:20Z)
• 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)
• AQD: Towards Accurate Fully-Quantized Object Detection [94.06347866374927]
  We propose an Accurate Quantized object Detection solution, termed AQD, to get rid of floating-point computation. Our AQD achieves comparable or even better performance compared with the full-precision counterpart under extremely low-bit schemes.
  arXiv  Detail & Related papers  (2020-07-14T09:07:29Z)
• Learning Stabilizing Controllers for Unstable Linear Quadratic Regulators from a Single Trajectory [85.29718245299341]
  We study linear controllers under quadratic costs model also known as linear quadratic regulators (LQR) We present two different semi-definite programs (SDP) which results in a controller that stabilizes all systems within an ellipsoid uncertainty set. We propose an efficient data dependent algorithm -- textsceXploration -- that with high probability quickly identifies a stabilizing controller.
  arXiv  Detail & Related papers  (2020-06-19T08:58:57Z)

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.