An addressable quantum dot qubit with fault-tolerant control fidelity

Abstract

Exciting progress towards spin-based quantum computing has recently been made with qubits realized using nitrogen-vacancy (N-V) centers in diamond and phosphorus atoms in silicon, including the demonstration of long coherence times made possible by the presence of spin-free isotopes of carbon and silicon. However, despite promising single-atom nanotechnologies, there remain substantial challenges in coupling such qubits and addressing them individually. Conversely, lithographically defined quantum dots have an exchange coupling that can be precisely engineered, but strong coupling to noise has severely limited their dephasing times and control fidelities. Here we combine the best aspects of both spin qubit schemes and demonstrate a gate-addressable quantum dot qubit in isotopically engineered silicon with a control fidelity of 99.6%, obtained via Clifford based randomized benchmarking and consistent with that required for fault-tolerant quantum computing. This qubit has orders of magnitude improved coherence times compared with other quantum dot qubits, with T_2* = 120 mus and T_2 = 28 ms. By gate-voltage tuning of the electron g*-factor, we can Stark shift the electron spin resonance (ESR) frequency by more than 3000 times the 2.4 kHz ESR linewidth, providing a direct path to large-scale arrays of addressable high-fidelity qubits that are compatible with existing manufacturing technologies.

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Cited by in corpus (72)

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• High-efficiency single photon emission from a silicon T-center in a nanobeam
• Robust quantum gates for stochastic time-varying noise
• Fast high-fidelity entangling gates for spin qubits in Si double quantum dots
• Hybrid superconductor-semiconductor systems for quantum technology
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• Gate controlled quantum dots in monolayer WSe2
• Pauli Blockade in a Few-Hole PMOS Double Quantum Dot limited by Spin-Orbit Interaction
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• A linear triple quantum dot system in isolated configuration
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• Si CMOS Platform for Quantum Information Processing
• Surpassing the Classical Limit in Magic Square Game with Distant Quantum Dots Coupled to Optical Cavities
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• High Fidelity Singlet-Triplet $S$-$T_{-}$ Qubits in Inhomogeneous Magnetic Fields
• Validity of the single-particle description and charge noise resilience for multielectron quantum dots
• Optical orientation of electron spins and valence band spectroscopy in germanium
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• Implementations of more general solid-state (SWAP)${}^{1/m}$ and controlled-(swap)${}^{1/m}$ gates
• 3-Dimensional Tuning of an Atomically Defined Silicon Tunnel Junction
• Accelerated adiabatic passage of a single electron spin qubit in quantum dots
• Decoherence of two coupled singlet-triplet spin qubits
• Low-temperature environments for quantum computation and quantum simulation
• Balancing coherent and dissipative dynamics in a central-spin system
• Phonon-induced relaxation and decoherence times of the hybrid qubit in silicon quantum dots
• Reconfigurable quantum logic gates using Rashba controlled spin polarized currents
• Photo-assisted spin transport in double quantum dots with spin-orbit interaction
• High-fidelity CNOT gate for spin qubits with asymmetric driving using virtual gates
• A quantitative study of bias triangles presented in chemical potential space
• Integrated multiplexed microwave readout of silicon quantum dots in a cryogenic CMOS chip
• All-Electrical Control of a Hybrid Electron Spin/Valley Quantum Bit in SOI CMOS Technology
• Decoherence and Quantum Error Correction for Quantum Computing and Communications
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• Decoherence of Coupled Flip-Flop Qubits Due to Charge Noise
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• Isotope engineering of silicon and diamond for quantum computing and sensing applications
• Bandwidth-limited and noisy pulse sequences for single qubit operations in semiconductor spin qubits
• Localized all-optical control of single semiconductor quantum dots through plasmon-polariton-induced screening
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• Quantum Transport in 40-nm MOSFETs at Deep-Cryogenic Temperatures
• Designs for a two-dimensional Si quantum dot array with spin qubit addressability