Phase-Sensitive Benchmarking of Composite Quantum Gates with Chiral-Interference Circuits on Quantum Hardware

• URL: http://arxiv.org/abs/2607.18137v1
• Date: Mon, 20 Jul 2026 16:29:30 GMT
• Title: Phase-Sensitive Benchmarking of Composite Quantum Gates with Chiral-Interference Circuits on Quantum Hardware
• Abstract summary: We implement gate-native circuits that simulate the state-transfer interference underlying three- and four-level chiral-resolution protocols.<n>On an IBM quantum processor, the two circuits produce the expected enantiomer-dependent output states with probabilities of nearly $98%$.<n>We then use these circuits as physically motivated, phase-sensitive benchmarks for composite quantum gates.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-sa/4.0/
• Abstract: We construct and experimentally implement compact gate-native circuits that simulate the state-transfer interference underlying three- and four-level chiral-resolution protocols. Both models are encoded in a two-qubit register, with the enantiomer-dependent sign of one of the couplings simulated by a conditional-phase operation in the four-level circuit and by the sign of a final rotation in the three-level circuit. On an IBM quantum processor, the two circuits produce the expected enantiomer-dependent output states with probabilities of nearly $98\%$. We then use these circuits as physically motivated, phase-sensitive benchmarks for composite quantum gates. We introduce rotation-angle error to the single-qubit operations and replace them by several composite gates, including B5, SK1, BB1, H5s, and X5. The comparison demonstrates that single-gate robustness does not translate to equivalent whole-circuit robustness. In particular, variable-rotation sequences do not preserve the required relative phases, making them unsuitable for error correction in circuits. By contrast, the H5s/X5 sequences maintain high target-state populations for relative errors as large as $50\%$, whereas elementary rotations reach the same threshold only for approximately $8\%$. The three-level circuit exhibits a similar enhancement and additionally reveals an error-cancellation symmetry whose protection under composite replacement is exact only when the relevant full propagators satisfy an inverse relation.

Related papers

• Benchmarking trigonometric continuous-variable gate primitives with trapped ions [0.0]
  Recently proposed trigonometric continuous-variable (CV) gate sets promote periodic functions of oscillator quadratures to elementary operations.<n>Here we experimentally demonstrate and benchmark one-qumode cosine gates, and perform a mode-resolved marginal benchmark of two-qumode cosine-gate implementations.<n>Our implementation uses collective motional modes of three- and four-ion $171rm Yb+$ chains and realizes finite-step trigonometric-gate circuits.
  arXiv  Detail & Related papers  (2026-07-15T17:57:48Z)
• Accelerating Transpilation in Quantum Machine Learning with Haiqu's Rivet-transpiler [45.88028371034407]
  We develop the Rivet transpiler, which accelerates transpilation by reusing previously transpiled circuits.<n>We demonstrate up to 600% improvement in transpilation time for quantum layerwise learning.
  arXiv  Detail & Related papers  (2025-08-29T06:00:29Z)
• Parity Cross-Resonance: A Multiqubit Gate [5.6995215414894735]
  We present a native three-qubit entangling gate that exploits engineered interactions to realize control-control-target and control-target-target operations.<n>We show it can be utilized in several ways, for example, in GHZ triplet state preparation.
  arXiv  Detail & Related papers  (2025-08-14T16:26:32Z)
• Moveless: Minimizing Overhead on QCCDs via Versatile Execution and Low Excess Shuttling [0.5833117322405447]
  We propose a compilation scheme specifically tailored for the structural regularity of QEC circuits.<n>Our resulting compiler, leads to QEC circuits which are on average 3.38x faster to execute, and lead to up to two orders of magnitude of improvement in logical error rates with realistic physical error rates.
  arXiv  Detail & Related papers  (2025-08-05T21:02:29Z)
• Performance Characterization of a Multi-Module Quantum Processor with Static Inter-Chip Couplers [63.42120407991982]
  Three-dimensional integration technologies such as flip-chip bonding are a key prerequisite to realize large-scale superconducting quantum processors.<n>We present a design for a multi-chip module comprising one carrier chip and four qubit modules.<n>Measuring two of the qubits, we analyze the readout performance, finding a mean three-level state-assignment error of $9 times 10-3$ in 200 ns.<n>We demonstrate a controlled-Z two-qubit gate in 100 ns with an error of $7 times 10-3$ extracted from interleaved randomized benchmarking.
  arXiv  Detail & Related papers  (2025-03-16T18:32:44Z)
• Single-step high-fidelity three-qubit gates by anisotropic chiral interactions [0.0]
  Direct multi-qubit gates are critical to facilitate quantum computations in near-term devices by reducing the gate counts and circuit depth.<n>Here, we demonstrate that fast and high fidelity three-qubit gates can be realized in a single step by leveraging small anisotropic and chiral three-qubit interactions.
  arXiv  Detail & Related papers  (2025-03-15T15:54:00Z)
• 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)
• Geometric Quantum Machine Learning with Horizontal Quantum Gates [41.912613724593875]
  We propose an alternative paradigm for the symmetry-informed construction of variational quantum circuits. We achieve this by introducing horizontal quantum gates, which only transform the state with respect to the directions to those of the symmetry. For a particular subclass of horizontal gates based on symmetric spaces, we can obtain efficient circuit decompositions for our gates through the KAK theorem.
  arXiv  Detail & Related papers  (2024-06-06T18:04:39Z)
• Software mitigation of coherent two-qubit gate errors [55.878249096379804]
  Two-qubit gates are important components of quantum computing. But unwanted interactions between qubits (so-called parasitic gates) can degrade the performance of quantum applications. We present two software methods to mitigate parasitic two-qubit gate errors.
  arXiv  Detail & Related papers  (2021-11-08T17:37:27Z)
• 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)
• Realization of arbitrary doubly-controlled quantum phase gates [62.997667081978825]
  We introduce a high-fidelity gate set inspired by a proposal for near-term quantum advantage in optimization problems. By orchestrating coherent, multi-level control over three transmon qutrits, we synthesize a family of deterministic, continuous-angle quantum phase gates acting in the natural three-qubit computational basis.
  arXiv  Detail & Related papers  (2021-08-03T17:49:09Z)
• Improving the Performance of Deep Quantum Optimization Algorithms with Continuous Gate Sets [47.00474212574662]
  Variational quantum algorithms are believed to be promising for solving computationally hard problems. In this paper, we experimentally investigate the circuit-depth-dependent performance of QAOA applied to exact-cover problem instances. Our results demonstrate that the use of continuous gate sets may be a key component in extending the impact of near-term quantum computers.
  arXiv  Detail & Related papers  (2020-05-11T17:20:51Z)

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.