Adversaries perturbing shared entanglement in distributed VQAs can manipulate a new Kraus expressibility metric to keep gradients large but steer training to incorrect solutions.
2508.16437 (2025)
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A capacitively shunted double-transmon coupler enables a 99.92% fidelity parametrically driven iSWAP gate at zero flux between detuned transmons with minimal residual ZZ interaction.
Far-detuned cross-resonance designs cut frequency collisions in transmon processors, achieving 10% collision-free yield for 1024 qubits with qubit-frequency spread reduced to 6.8 MHz.
Parity Architecture delivers record ~0.01 fidelity for 50-qubit QFT on IBM hardware with super-exponential scaling improvement.
Constraint-aware initialization and hybrid XY-X mixer in QAOA for VRP yield lower average energies and higher feasible-solution ratios than standard QAOA across ideal, finite-shot, and noisy simulations.
A floating tunable coupler allows 24 ns adiabatic CZ gates above 99.9% fidelity with exact ZZ=0 at idle for fixed-frequency transmons.
DMET combined with SQD on IBM Eagle hardware achieves chemical accuracy for ground-state energies of low-symmetry ligand-like molecules.
Optimal control theory designs high-fidelity quantum gates in multilevel systems that incorporate thermal relaxation and enable targeted cooling or heating during operation.
Offset-charge-tunable transmon qubit achieves 99.37% fidelity in charge-parity mapping and over 93.4% in continuous monitoring at 4 μs intervals via randomized benchmarking.
citing papers explorer
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Adversarial Effects on Expressibility and Trainability in Distributed Variational Quantum Algorithms
Adversaries perturbing shared entanglement in distributed VQAs can manipulate a new Kraus expressibility metric to keep gradients large but steer training to incorrect solutions.
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Parametrically Driven iSWAP Gate Using a Capacitively Shunted Double-Transmon Coupler at the Zero-Flux Sweet Spot
A capacitively shunted double-transmon coupler enables a 99.92% fidelity parametrically driven iSWAP gate at zero flux between detuned transmons with minimal residual ZZ interaction.
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Systematic frequency-collision analysis of the cross-resonance gate outside the straddling regime
Far-detuned cross-resonance designs cut frequency collisions in transmon processors, achieving 10% collision-free yield for 1024 qubits with qubit-frequency spread reduced to 6.8 MHz.
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Demonstrating Record Fidelity for the Quantum Fourier Transform
Parity Architecture delivers record ~0.01 fidelity for 50-qubit QFT on IBM hardware with super-exponential scaling improvement.
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Improving Feasibility in Quantum Approximate Optimization Algorithm for Vehicle Routing via Constraint-Aware Initialization and Hybrid XY-X Mixing
Constraint-aware initialization and hybrid XY-X mixer in QAOA for VRP yield lower average energies and higher feasible-solution ratios than standard QAOA across ideal, finite-shot, and noisy simulations.
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Unlocking a fast adiabatic CZ gate and exact residual $ZZ$ cancellation between fixed-frequency transmons using a floating tunable coupler
A floating tunable coupler allows 24 ns adiabatic CZ gates above 99.9% fidelity with exact ZZ=0 at idle for fixed-frequency transmons.
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Quantum Simulation of Ligand-like Molecules through Sample-based Quantum Diagonalization in Density Matrix Embedding Framework
DMET combined with SQD on IBM Eagle hardware achieves chemical accuracy for ground-state energies of low-symmetry ligand-like molecules.
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Optimal Control of thermally noisy quantum gates in a multilevel system
Optimal control theory designs high-fidelity quantum gates in multilevel systems that incorporate thermal relaxation and enable targeted cooling or heating during operation.
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Characterizing charge-parity detection based on an offset-charge-tunable transmon qubit via randomized benchmarking
Offset-charge-tunable transmon qubit achieves 99.37% fidelity in charge-parity mapping and over 93.4% in continuous monitoring at 4 μs intervals via randomized benchmarking.