Interplay of Zeeman Splitting and Tunnel Coupling in Coherent Spin Qubit Shuttling
arXiv:2507.15554 · doi:10.1103/3d1t-pr7m
Abstract
Spin shuttling offers a promising approach for developing scalable silicon-based quantum processors by addressing the connectivity limitations of quantum dots. In this work, we demonstrate high-fidelity bucket-brigade spin shuttling in a silicon MOS device, utilizing Pauli-spin-blockade readout. We achieve an average shuttling fidelity of \SI{99.8}{\percent}. The residual shuttling error is highly sensitive to the ratio between interdot tunnel coupling and Zeeman splitting, with tuning of these parameters enabling up to a 20-fold variation in error rate. An appropriate four-level Hamiltonian model supports our findings. These results provide valuable insights for optimizing high-performance spin-shuttling systems in future quantum architectures.
References in corpus (46)
- An addressable quantum dot qubit with fault-tolerant control fidelity
- Landau-Zener-Stuckelberg interferometry
- Computing with spin qubits at the surface code error threshold
- Fast universal quantum control above the fault-tolerance threshold in silicon
- Two-qubit silicon quantum processor with operation fidelity exceeding 99%
- Universal quantum logic in hot silicon qubits
- Shuttling a single charge across a one-dimensional array of silicon quantum dots
- Scaling silicon-based quantum computing using CMOS technology: State-of-the-art, Challenges and Perspectives
- Silicon qubit fidelities approaching incoherent noise limits via pulse engineering
- Differential Charge Sensing and Charge Delocalization in a Tunable Double Quantum Dot
- Probing quantum devices with radio-frequency reflectometry
- Coherent spin qubit transport in silicon
- Conveyor-mode single-electron shuttling in Si/SiGe for a scalable quantum computing architecture
- Efficient C-Phase gate for single-spin qubits in quantum dots
- High-fidelity operation and algorithmic initialisation of spin qubits above one kelvin
- Spin-orbit coupling and operation of multi-valley spin qubits
- Pauli Blockade in Silicon Quantum Dots with Spin-Orbit Control
- A shuttling-based two-qubit logic gate for linking distant silicon quantum processors
- Controlling spin-orbit interactions in silicon quantum dots using magnetic field direction
- Observation of the single-electron regime in a highly tunable silicon quantum dot
- Single-spin qubits in isotopically enriched silicon at low magnetic field
- The SpinBus Architecture: Scaling Spin Qubits with Electron Shuttling
- On-demand electrical control of spin qubits
- Shuttling an electron spin through a silicon quantum dot array
- Low charge noise quantum dots with industrial CMOS manufacturing
- 12-spin-qubit arrays fabricated on a 300 mm semiconductor manufacturing line
- Si/SiGe QuBus for single electron information-processing devices with memory and micron-scale connectivity function
- Two-qubit logic between distant spins in silicon
- A 300 mm foundry silicon spin qubit unit cell exceeding 99% fidelity in all operations
- Efficient orthogonal control of tunnel couplings in a quantum dot array
- Qubit gates with simultaneous transport in double quantum dots
- Rapid single-shot parity spin readout in a silicon double quantum dot with fidelity exceeding 99 %
- Simulated coherent electron shuttling in silicon quantum dots
- High-fidelity single-spin shuttling in silicon
- Strategies for enhancing spin-shuttling fidelities in Si/SiGe quantum wells with random-alloy disorder
- Exciton transport in a germanium quantum dot ladder
- Towards early fault tolerance on a 2N array of qubits equipped with shuttling
- Jellybean quantum dots in silicon for qubit coupling and on-chip quantum chemistry
- Real-time feedback protocols for optimizing fault-tolerant two-qubit gate fidelities in a silicon spin system
- Violating Bell's inequality in gate-defined quantum dots
- Control of dephasing in spin qubits during coherent transport in silicon
- Impact of electrostatic crosstalk on spin qubits in dense CMOS quantum dot arrays
- Operating semiconductor qubits without individual barrier gates
- The origins of noise in the Zeeman splitting of spin qubits in natural-silicon devices
- A 2x2 quantum dot array in silicon with fully tuneable pairwise interdot coupling
- Mitigation of exchange cross-talk in dense quantum dot arrays