A new sparse Pauli-frame method shows coherent noise thresholds are overestimated by a factor of ~4 under Pauli-twirling and revises the T-to-S gate error rate factor to as high as 7 at distance d=5.
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A circular-modulated concatenated continuous driving (CMCCD) protocol for silicon qubits cancels counter-rotating errors via dual modulation and shows higher simulated fidelity plus improved experimental robustness to detuning and Rabi errors compared to standard Rabi or prior CCD drives.
Shuttling check qubits in a spin-qubit railway and using the XZZX surface code under dephasing bias achieves a distance-7 megaquop footprint at 10^{-3} physical error rate.
Heterogeneous quantum architectures with task-specific hardware and QEC encodings deliver up to 138x lower physical-qubit overhead than monolithic baselines for fault-tolerant algorithms, including RSA-2048 factoring at 190k-381k qubits.
A new optimal-control scheme achieves high-fidelity two-qubit iSWAP gates for Rydberg atoms at separations exceeding 20 micrometers through coherent excitation-exchange-deexcitation dynamics.
Dynamical control schemes for dual-rail erasure qubits suppress transmon-induced noise, reducing erasure check errors by three orders of magnitude and logical two-qubit gate infidelities by up to three orders of magnitude.
Numerical leakage-aware randomized benchmarking shows that operating a Si:P donor spin system as a native ququart (C4 Clifford group) yields 40-50% lower error rates than encoded two-qubit operation (C2^⊗2) under charge noise, due to reduced circuit complexity.
citing papers explorer
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Computing logical error thresholds with the Pauli Frame Sparse Representation
A new sparse Pauli-frame method shows coherent noise thresholds are overestimated by a factor of ~4 under Pauli-twirling and revises the T-to-S gate error rate factor to as high as 7 at distance d=5.
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Concatenated continuous driving of silicon qubit by amplitude and phase modulation
A circular-modulated concatenated continuous driving (CMCCD) protocol for silicon qubits cancels counter-rotating errors via dual modulation and shows higher simulated fidelity plus improved experimental robustness to detuning and Rabi errors compared to standard Rabi or prior CCD drives.
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Surface-Code Thresholds and Qubit Footprints in Shuttling-Based Spin-Qubit Railways
Shuttling check qubits in a spin-qubit railway and using the XZZX surface code under dephasing bias achieves a distance-7 megaquop footprint at 10^{-3} physical error rate.
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Heterogeneous architectures enable a 138x reduction in physical qubit requirements for fault-tolerant quantum computing under detailed accounting
Heterogeneous quantum architectures with task-specific hardware and QEC encodings deliver up to 138x lower physical-qubit overhead than monolithic baselines for fault-tolerant algorithms, including RSA-2048 factoring at 190k-381k qubits.
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Fast Quantum Gates for Neutral Atoms Separated by a Few Tens of Micrometers
A new optimal-control scheme achieves high-fidelity two-qubit iSWAP gates for Rydberg atoms at separations exceeding 20 micrometers through coherent excitation-exchange-deexcitation dynamics.
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Dynamical error reshaping for dual-rail erasure qubits
Dynamical control schemes for dual-rail erasure qubits suppress transmon-induced noise, reducing erasure check errors by three orders of magnitude and logical two-qubit gate infidelities by up to three orders of magnitude.
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Fidelity Analysis of Adiabatically Driven Donor Spins as Two-Qubit and Ququart Systems
Numerical leakage-aware randomized benchmarking shows that operating a Si:P donor spin system as a native ququart (C4 Clifford group) yields 40-50% lower error rates than encoded two-qubit operation (C2^⊗2) under charge noise, due to reduced circuit complexity.