A silicon quantum-dot-coupled nuclear spin qubit

Abstract

Single nuclear spins in the solid state have long been envisaged as a platform for quantum computing, due to their long coherence times and excellent controllability. Measurements can be performed via localised electrons, for example those in single atom dopants or crystal defects. However, establishing long-range interactions between multiple dopants or defects is challenging. Conversely, in lithographically-defined quantum dots, tuneable interdot electron tunnelling allows direct coupling of electron spin-based qubits in neighbouring dots. Moreover, compatibility with semiconductor fabrication techniques provides a compelling route to scaling to large numbers of qubits. Unfortunately, hyperfine interactions are typically too weak to address single nuclei. Here we show that for electrons in silicon metal-oxide-semiconductor quantum dots the hyperfine interaction is sufficient to initialise, read-out and control single silicon-29 nuclear spins, yielding a combination of the long coherence times of nuclear spins with the flexibility and scalability of quantum dot systems. We demonstrate high-fidelity projective readout and control of the nuclear spin qubit, as well as entanglement between the nuclear and electron spins. Crucially, we find that both the nuclear spin and electron spin retain their coherence while moving the electron between quantum dots, paving the way to long range nuclear-nuclear entanglement via electron shuttling. Our results establish nuclear spins in quantum dots as a powerful new resource for quantum processing.

References in corpus (29)

• Purification of Noisy Entanglement and Faithful Teleportation via Noisy Channels
• Single-shot read-out of an individual electron spin in a quantum dot
• NMR Techniques for Quantum Control and Computation
• Heralded entanglement between solid-state qubits separated by 3 meters
• An addressable quantum dot qubit with fault-tolerant control fidelity
• A Two Qubit Logic Gate in Silicon
• A programmable two-qubit quantum processor in silicon
• Storing quantum information for 30 seconds in a nanoelectronic device
• A CMOS silicon spin qubit
• Quantum CNOT Gate for Spins in Silicon
• High-fidelity readout and control of a nuclear spin qubit in silicon
• Triplet-Singlet Spin Relaxation via Nuclei in a Double Quantum Dot
• A Coherent Spin-Photon Interface in Silicon
• Room temperature quantum bit storage exceeding 39 minutes using ionized donors in 28-silicon
• Strong spin-photon coupling in silicon
• Fidelity benchmarks for two-qubit gates in silicon
• Spin-valley lifetimes in a silicon quantum dot with tunable valley splitting
• One-second coherence for a single electron spin coupled to a multi-qubit nuclear-spin environment
• An all silicon quantum computer
• Topological quantum computing with a very noisy network and local error rates approaching one percent
• Hydrogenic Spin Quantum Computing in Silicon: A Digital Approach
• Silicon quantum processor with robust long-distance qubit couplings
• Coherent shuttle of electron-spin states
• Hyperfine interactions in silicon quantum dots
• Bell's inequality violation with spins in silicon
• Surface code architecture for donors and dots in silicon with imprecise and nonuniform qubit couplings
• Coherent Control of a Single Silicon-29 Nuclear Spin Qubit
• 99.992 % ${}^{28}$Si CVD-grown epilayer on 300 mm substrates for large scale integration of silicon spin qubits
• ${}^{29}$Si nuclear spins as a resource for donor spin qubits in silicon

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• Quantum sensing of a coherent single spin excitation in a nuclear ensemble
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• Deep learning enhanced individual nuclear-spin detection
• Bell-state tomography in a silicon many-electron artificial molecule
• Versatile Direct Writing of Dopants in a Solid State Host Through Recoil Implantation
• Roadmap on Atomic-scale Semiconductor Devices
• Nuclear spin readout in a cavity-coupled hybrid quantum dot-donor system
• Spin rotation by resonant electric field in few-level quantum dots: Floquet dynamics and tunneling
• Single-Step Parity Check Gate Set for Quantum Error Correction
• Observing hyperfine interactions of NV centers in diamond in an advanced quantum teaching lab
• Non-Markovian transient spectroscopy in cavity QED
• Level anticrossing effect in single-level or multilevel double quantum dots: Electrical conductance, zero-frequency charge susceptibility and Seebeck coefficient
• Error channels in quantum nondemolition measurements on spin systems
• Control of dephasing in spin qubits during coherent transport in silicon
• Nuclear Spin Engineering for Quantum Information Science
• Engineering local strain for single-atom nuclear acoustic resonance in silicon
• Single-shot readout of the nuclear spin of an on-surface atom
• The origins of noise in the Zeeman splitting of spin qubits in natural-silicon devices
• Improved Electron-Nuclear Quantum Gates for Spin Sensing and Control
• Time-crystalline behavior in central-spin models with Heisenberg interactions
• Quantum non-demolition measurement of an electron spin qubit through its low-energy many-body spin environment
• Tunable Gyromagnetic Augmentation of Nuclear Spins in Diamond
• Wavelet correlation noise analysis for qubit operation variable time series
• Superradiant-like dynamics by electron shuttling on a nuclear-spin island
• Entangling nuclear spins in distant quantum dots via an electron bus
• Thermal activation of low-density Ga implanted in Ge
• Coupling a ${}^{73}$Ge nuclear spin to an electrostatically defined quantum dot
• Fully tunable hyperfine interactions of hole spin qubits in Si and Ge quantum dots