The exchange-only singlet-only spin qubit

Abstract

We propose a feasible and scalable quantum-dot-based implementation of a singlet-only spin qubit which is to leading order intrinsically insensitive to random effective magnetic fields set up by fluctuating nuclear spins in the host semiconductor. Our proposal thus removes an important obstacle for further improvement of spin qubits hosted in high-quality III-V semiconductors such as GaAs. We show how the resulting qubit could be initialized, manipulated, and read out by electrical means only, in a way very similar to a triple-dot exchange-only spin qubit. Due to the intrinsic elimination of the effective nuclear fields from the qubit Hamiltonian, we find an improvement of the dephasing time $T_2^{\ast }$ of several orders of magnitude as compared to similar existing spin qubits.

5 pages, two figures plus supplementary material. The new version includes a few minor changes in the text and some new references

References in corpus (17)

• Single-shot read-out of an individual electron spin in a quantum dot
• Driven coherent oscillations of a single electron spin in a quantum dot
• An addressable quantum dot qubit with fault-tolerant control fidelity
• Scalable gate architecture for densely packed semiconductor spin qubits
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• Coherent spin manipulation in an exchange-only qubit
• Noise suppression using symmetric exchange gates in spin qubits
• Suppressing qubit dephasing using real-time Hamiltonian estimation
• Singlet-triplet decoherence due to nuclear spins in a double quantum dot
• Spin-Orbit Mediated Control of Spin Qubits
• Notch filtering the nuclear environment of a spin qubit
• Orbital and spin relaxation in single and coupled quantum dots
• Charge-noise-insensitive gate operations for always-on, exchange-only qubits
• A few-electron quadruple quantum dot in a closed loop
• Full control of quadruple quantum dot circuit charge states in the single electron regime
• Decoherence of an exchange qubit by hyperfine interaction
• Optimizing electrically controlled echo sequences for the exchange-only qubit

Cited by in corpus (25)

• Semiconductor Spin Qubits
• Roadmap for gallium arsenide spin qubits
• Roadmap on quantum nanotechnologies
• Colloquium: Advances in automation of quantum dot devices control
• Quantum simulation of antiferromagnetic Heisenberg chain with gate-defined quantum dots
• A quadrupolar exchange-only spin qubit
• Long-Distance Superexchange between Semiconductor Quantum-Dot Electron Spins
• Spin of a multielectron quantum dot and its interaction with a neighboring electron
• Coherent multi-spin exchange coupling in a quantum-dot spin chain
• Highly tunable exchange-only singlet-only qubit in a GaAs triple quantum dot
• Protected Solid-State Qubits
• Dynamical second-order noise sweetspots in resonantly driven spin qubits
• A spinless spin qubit
• YSR Bond Qubit in a Double Quantum Dot with cQED Operation
• Leakage and dephasing in ${}^{28}$Si-based exchange-only spin qubits
• Universal control of superexchange in linear triple quantum dots with an empty mediator
• Proposal for a cavity-induced measurement of the exchange coupling in quantum dots
• Sign-switching of superexchange mediated by few electrons under non-uniform magnetic field
• Singlet-only Always-on Gapless Exchange Qubits with Baseband Control
• True decoherence-free-subspace derived from a semiconductor double quantum dot Heisenberg spin-trimer
• Qubit based on spin-singlet Yu-Shiba-Rusinov states
• Transport-induced suppression of nuclear field fluctuations in multi-quantum-dot systems
• Limitations on the maximal level of entanglement of two singlet-triplet qubits in GaAs quantum dots
• Exploring Entanglement Spectrum and Phase Diagram in multi-electron Quantum Dot Chains
• Qubit decoherence under two-axis coupling to low-frequency noises