Unfolded distillation prepares an |X^{1/4}> magic state with logical error 3e-7 using 53 biased-noise qubits and 5.5 rounds, by unfolding the 3D Reed-Muller X-stabilizers into a 2D layout.
Cifuentes, Fay E
21 Pith papers cite this work, alongside 5 external citations. Polarity classification is still indexing.
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Pith papers citing it
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external citations · OpenAlex
abstract
Fabrication of quantum processors in advanced 300 mm wafer-scale complementary metal-oxide-semiconductor (CMOS) foundries provides a unique scaling pathway towards commercially viable quantum computing with potentially millions of qubits on a single chip. Here, we show precise qubit operation of a silicon two-qubit device made in a 300 mm semiconductor processing line. The key metrics including single- and two-qubit control fidelities exceed 99% and state preparation and measurement fidelity exceeds 99.9%, as evidenced by gate set tomography (GST). We report coherence and lifetimes up to $T_\mathrm{2}^{\mathrm{*}} = 30.4$ $\mu$s, $T_\mathrm{2}^{\mathrm{Hahn}} = 803$ $\mu$s, and $T_1 = 6.3$ s. Crucially, the dominant operational errors originate from residual nuclear spin carrying isotopes, solvable with further isotopic purification, rather than charge noise arising from the dielectric environment. Our results answer the longstanding question whether the favourable properties including high-fidelity operation and long coherence times can be preserved when transitioning from a tailored academic to an industrial semiconductor fabrication technology.
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A singlet-only, always-on, gapless exchange qubit in a T-shaped four-dot geometry provides protection from magnetic field gradients and suppressed leakage, improving simulated coherence and gate fidelities in gradient-dominated regimes.
Symmetric plunger-gate pulses tune the exchange coupling between two germanium spin qubits from 100 kHz to 60 MHz at zero detuning, enabling a controlled-Z gate without pulsing barrier gates.
A shuttling-based silicon-spin architecture with logical qubits as mobile 1D strings can tolerate static defects by detecting them with monitor qubits and complementary-gap filtering, then reversing suspected corruption via snake surgery.
Spin hopping between dots with differently tilted quantization axes performs high-fidelity microwave-free single-qubit control in a silicon 2x2 array.
CAbLECAR provides a robotics-inspired shuttle scheduler that enables QLDPC codes on tileable spin-qubit hardware, yielding up to 86% faster schedules and orders-of-magnitude gains in encoding efficiency and logical error rates over surface codes.
A single combined baseband plus resonant exchange pulse realizes a tunable fSim gate family in spin qubits, demonstrated as an iSWAP with 93.8(5)% interleaved randomized benchmarking fidelity.
Simulated distance-3 surface codes on silicon spin qubits convert slowly varying 1/f noise into memory-less logical noise, giving a quartic coherence-time scaling T*_2,L proportional to (T*_2)^4.
A switchable quantum-dot-plus-Andreev-spin coupler can read a germanium dot-spin qubit in under a microsecond with theoretical fidelity above 99.9%.
Quantized single-electron pumping is demonstrated in devices fabricated by a commercial 22nm CMOS foundry, with a parallel-pumped current accurate to 1.2e-3 A/A at 50 MHz.
Bias-preserving CZ gates plus small residual CNOT bias enable a 90% threshold improvement and up to 75% footprint reduction for the XZZX code in two-level qubits.
A compact single-electron-box sensor in an industrial silicon MOS process achieves 99.92% parity readout fidelity in 340 microseconds and distinguishes three two-electron spin states with a Hidden Markov Model.
A numerical study of three-hole spin qubits in germanium quantum dots predicts Rabi frequencies up to two orders of magnitude larger than single-hole qubits in quasi-circular dots, with comparable or better quality factors.
A trilinear quantum dot layout with a middle shuttling array could give semiconductor spin qubits two-dimensional connectivity while keeping each dot individually wireable.
A shortest-path swap-routing method produces pulse sequences for two-qubit exchange-only gates on 450 planar six-dot topologies, with experimental truth-table checks on Intel hardware.
A 2x2 array of silicon MOS quantum dots demonstrates voltage-tunable tunnel coupling between every neighboring pair at 4.2 K.
Pseudo-spin conservation blocks current-driven transitions between the two lowest Andreev levels in a three-terminal spin-orbit Josephson junction, so a magnetic field or magnetic impurities are needed to operate it as a qubit.
A U-Net CNN segments experimental charge stability diagrams to locate the single-charge regime in 300 mm FDSOI quantum dots with 80% overall success and up to 88% on some designs.
A foundry-made silicon double-dot device reads out a two-electron singlet-triplet qubit in a single shot through its own control gate, with coherent exchange oscillations and operation up to 1 K.
For near-term spin-qubit devices, compilation can make sparsely connected layouts perform as well as highly connected ones, and crosstalk can erase the benefit of extra connectivity.
citing papers explorer
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Unfolded distillation: very low-cost magic state preparation for biased-noise qubits
Unfolded distillation prepares an |X^{1/4}> magic state with logical error 3e-7 using 53 biased-noise qubits and 5.5 rounds, by unfolding the 3D Reed-Muller X-stabilizers into a 2D layout.
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Singlet-only Always-on Gapless Exchange Qubits with Baseband Control
A singlet-only, always-on, gapless exchange qubit in a T-shaped four-dot geometry provides protection from magnetic field gradients and suppressed leakage, improving simulated coherence and gate fidelities in gradient-dominated regimes.
-
Operating semiconductor qubits without individual barrier gates
Symmetric plunger-gate pulses tune the exchange coupling between two germanium spin qubits from 100 kHz to 60 MHz at zero detuning, enabling a controlled-Z gate without pulsing barrier gates.
-
Snakes on a Plane: mobile, low dimensional logical qubits on a 2D surface
A shuttling-based silicon-spin architecture with logical qubits as mobile 1D strings can tolerate static defects by detecting them with monitor qubits and complementary-gap filtering, then reversing suspected corruption via snake surgery.
-
Baseband control of single-electron silicon spin qubits in two dimensions
Spin hopping between dots with differently tilted quantization axes performs high-fidelity microwave-free single-qubit control in a silicon 2x2 array.
-
CAbLECAR: efficiently scheduling QLDPC codes on a tileable spin qubit chip with shuttling
CAbLECAR provides a robotics-inspired shuttle scheduler that enables QLDPC codes on tileable spin-qubit hardware, yielding up to 86% faster schedules and orders-of-magnitude gains in encoding efficiency and logical error rates over surface codes.
-
Resonant two-qubit gates for fermionic simulations with spin qubits
A single combined baseband plus resonant exchange pulse realizes a tunable fSim gate family in spin qubits, demonstrated as an iSWAP with 93.8(5)% interleaved randomized benchmarking fidelity.
-
Simulated non-Markovian Noise Resilience of Silicon-Based Spin Qubits with Surface Code Error Correction
Simulated distance-3 surface codes on silicon spin qubits convert slowly varying 1/f noise into memory-less logical noise, giving a quartic coherence-time scaling T*_2,L proportional to (T*_2)^4.
-
Fast readout of quantum dot spin qubits via Andreev spins
A switchable quantum-dot-plus-Andreev-spin coupler can read a germanium dot-spin qubit in under a microsecond with theoretical fidelity above 99.9%.
-
Scalable quantum current source on commercial CMOS process technology
Quantized single-electron pumping is demonstrated in devices fabricated by a commercial 22nm CMOS foundry, with a parallel-pumped current accurate to 1.2e-3 A/A at 50 MHz.
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Leveraging biased noise for more efficient quantum error correction at the circuit-level with two-level qubits
Bias-preserving CZ gates plus small residual CNOT bias enable a 90% threshold improvement and up to 75% footprint reduction for the XZZX code in two-level qubits.
-
High-fidelity dispersive spin sensing in a tuneable unit cell of silicon MOS quantum dots
A compact single-electron-box sensor in an industrial silicon MOS process achieves 99.92% parity readout fidelity in 340 microseconds and distinguishes three two-electron spin states with a Hidden Markov Model.
-
Hole-spin qubits in germanium beyond the single-particle regime
A numerical study of three-hole spin qubits in germanium quantum dots predicts Rabi frequencies up to two orders of magnitude larger than single-hole qubits in quasi-circular dots, with comparable or better quality factors.
-
A trilinear quantum dot architecture for semiconductor spin qubits
A trilinear quantum dot layout with a middle shuttling array could give semiconductor spin qubits two-dimensional connectivity while keeping each dot individually wireable.
-
Short two-qubit pulse sequences for exchange-only spin qubits in 2D layouts
A shortest-path swap-routing method produces pulse sequences for two-qubit exchange-only gates on 450 planar six-dot topologies, with experimental truth-table checks on Intel hardware.
-
A 2x2 quantum dot array in silicon with fully tuneable pairwise interdot coupling
A 2x2 array of silicon MOS quantum dots demonstrates voltage-tunable tunnel coupling between every neighboring pair at 4.2 K.
-
Theory of three-terminal Andreev spin qubits
Pseudo-spin conservation blocks current-driven transitions between the two lowest Andreev levels in a three-terminal spin-orbit Josephson junction, so a magnetic field or magnetic impurities are needed to operate it as a qubit.
-
Automatic Charge State Tuning of 300 mm FDSOI Quantum Dots Using Neural Network Segmentation of Charge Stability Diagram
A U-Net CNN segments experimental charge stability diagrams to locate the single-charge regime in 300 mm FDSOI quantum dots with 80% overall success and up to 88% on some designs.
-
A foundry-fabricated spin qubit unit cell with in-situ dispersive readout
A foundry-made silicon double-dot device reads out a two-electron singlet-triplet qubit in a single shot through its own control gate, with coherent exchange oscillations and operation up to 1 K.
-
Near-Term Spin-Qubit Architecture Design via Multipartite Maximally-Entangled States
For near-term spin-qubit devices, compilation can make sparsely connected layouts perform as well as highly connected ones, and crosstalk can erase the benefit of extra connectivity.
- Readout sweet spots for spin qubits with strong spin-orbit interaction