Robust iSWAP gates for semiconductor spin qubits with local driving

Abstract

Scalable quantum computation demands high-fidelity two-qubit gates. However, decoherence and control errors are inevitable, which can decrease the quality of implemented quantum operations. We propose a robust iSWAP gate protocol for semiconductor spin qubits, which is a promising platform for scalable quantum computing. Our scheme uses only local microwave drives on conventional exchange-coupled spin qubits. This approach simultaneously addresses two critical challenges on semiconductor quantum computing: it suppresses low-frequency noise via continuous dynamical decoupling, and it circumvents the control difficulties associated with the ac modulation of the exchange interaction. We further develop a composite pulse sequence to remove drive-strength constraints and a dynamically corrected method to provide first-order immunity to microwave amplitude errors.Numerical simulations confirm that our scheme can achieve fidelity above the fault-tolerance threshold under current experimental conditions, offering a building block for practical quantum processors.

References in corpus (31)

• Quantum Computation with Quantum Dots
• Surface codes: Towards practical large-scale quantum computation
• Silicon Quantum Electronics
• Coherent control of a single electron spin with electric fields
• An addressable quantum dot qubit with fault-tolerant control fidelity
• A >99.9%-fidelity quantum-dot spin qubit with coherence limited by charge noise
• Semiconductor Spin Qubits
• Electrically driven single electron spin resonance in a slanting Zeeman field
• Quantum CNOT Gate for Spins in Silicon
• Computing with spin qubits at the surface code error threshold
• Fast universal quantum control above the fault-tolerance threshold in silicon
• Semiconductor Qubits In Practice
• Two-qubit silicon quantum processor with operation fidelity exceeding 99%
• Reduced sensitivity to charge noise in semiconductor spin qubits via symmetric operation
• Noise suppression using symmetric exchange gates in spin qubits
• Assessment of a silicon quantum dot spin qubit environment via noise spectroscopy
• Implementation of the XY interaction family with calibration of a single pulse
• A Dressed Spin Qubit in Silicon
• Coherent transfer of quantum information in silicon using resonant SWAP gates
• Resonantly driven singlet-triplet spin qubit in silicon
• Automated tuning of inter-dot tunnel couplings in quantum dot arrays
• High fidelity state preparation, quantum control, and readout of an isotopically enriched silicon spin qubit
• Spin readout of a CMOS quantum dot by gate reflectometry and spin-dependent tunnelling
• Assessment of error variation in high-fidelity two-qubit gates in silicon
• The fastest pulses that implement dynamically corrected gates
• Coherence of a driven electron spin qubit actively decoupled from quasi-static noise
• High-fidelity gate set for exchange-coupled singlet-triplet qubits
• Long-range entanglement for spin qubits via quantum Hall edge modes
• Clock transition by continuous dynamical decoupling of a three-level system
• Resonant Exchange Operation in Triple-Quantum-Dot Qubits for Spin-Photon Transduction
• Quantum simulation of fermionic systems using hybrid digital-analog quantum computing approach