Highly tunable exchange-only singlet-only qubit in a GaAs triple quantum dot

Abstract

We propose an implementation of a singlet-only spin qubit in a GaAs-based triple quantum dot with a (1,4,1) charge occupation. In the central multi-electron dot, the interplay between Coulomb interaction and an out-of-plane magnetic field creates an energy spectrum with a tunable singlet-triplet splitting, which can be exploited to create a six-particle singlet-only qubit with a qubit splitting that can straightforwardly be tuned over tens of $\mu$eV by adjusting the external magnetic field. We confirm the full exchange-based electric control of the qubit and demonstrate its superior coherence properties due to its singlet-only nature.

arXiv comment5 pages, 3 figures, plus Supplemental Material

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Cited by in corpus (14)

• Semiconductor Qubits In Practice
• Long-Distance Superexchange between Semiconductor Quantum-Dot Electron Spins
• Coherent multi-spin exchange coupling in a quantum-dot spin chain
• Optical measurement of electron spins in quantum dots: Quantum Zeno effects
• Protected Solid-State Qubits
• Dynamical second-order noise sweetspots in resonantly driven spin qubits
• Theory on electron-phonon spin dehphasing in GaAs multi-electron double quantum dots
• True decoherence-free-subspace derived from a semiconductor double quantum dot Heisenberg spin-trimer
• The role of antisymmetric orbitals and electron-electron interactions on the two-particle spin and valley blockade in graphene double quantum dots
• Singlet-only Always-on Gapless Exchange Qubits with Baseband Control
• Qubit based on spin-singlet Yu-Shiba-Rusinov states
• Transport-induced suppression of nuclear field fluctuations in multi-quantum-dot systems
• Exploring Entanglement Spectrum and Phase Diagram in multi-electron Quantum Dot Chains
• Jenga-Krotov algorithm: Efficient compilation of multi-qubit gates for exchange-only qubits