A sampling method combining fast Walsh-Hadamard transform and Clifford-preconditioned Monte Carlo reduces Pauli-string sampling cost from O(2^N) to O(N) with sample count independent of N for stabilizer Rényi entropies and nullity.
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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.
A floating tunable coupler allows 24 ns adiabatic CZ gates above 99.9% fidelity with exact ZZ=0 at idle for fixed-frequency transmons.
Derives analytic expressions for randomized benchmarking under temporally correlated non-Markovian noise, identifies cases where correlations are invisible to RB, and shows they can affect diamond norm errors.
citing papers explorer
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Exponentially Accelerated Sampling of Pauli Strings for Nonstabilizerness
A sampling method combining fast Walsh-Hadamard transform and Clifford-preconditioned Monte Carlo reduces Pauli-string sampling cost from O(2^N) to O(N) with sample count independent of N for stabilizer Rényi entropies and nullity.
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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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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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Blind-spots of Randomized Benchmarking Under Temporal Correlations
Derives analytic expressions for randomized benchmarking under temporally correlated non-Markovian noise, identifies cases where correlations are invisible to RB, and shows they can affect diamond norm errors.