Single-spin manipulation in a double quantum dot in the field of a micromagnet

Abstract

The manipulation of single spins in double quantum dots by making use of the exchange interaction and a highly inhomogeneous magnetic field was discussed in [W. A. Coish and D. Loss, Phys. Rev. B 75, 161302 (2007)]. However, such large inhomogeneity is difficult to achieve through the slanting field of a micromagnet in current designs of lateral double dots. Therefore, we examine an analogous spin manipulation scheme directly applicable to realistic GaAs double dot setups. We estimate that typical gate times, realized at the singlet-triplet anticrossing induced by the inhomogeneous micromagnet field, can be a few nanoseconds. We discuss the optimization of initialization, read-out, and single-spin gates through suitable choices of detuning pulses and an improved geometry. We also examine the effect of nuclear dephasing and charge noise. The latter induces fluctuations of both detuning and tunneling amplitude. Our results suggest that this scheme is a promising approach for the realization of fast single-spin operations.

arXiv comment13 pages, 11 figures

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• A logical qubit in a linear array of semiconductor quantum dots
• Wiedemann-Franz Law for Magnon Transport
• Coherent electron-spin-resonance manipulation of three individual spins in a triple quantum dot
• Single-electron Spin Resonance in a Quadruple Quantum Dot
• Enhancing the dipolar coupling of a $S$-$T_0$ qubit with a transverse sweet spot
• High Fidelity Singlet-Triplet $S$-$T_{-}$ Qubits in Inhomogeneous Magnetic Fields
• Robust energy selective tunneling readout of singlet triplet qubits under large magnetic field gradient
• Phonon-assisted relaxation and decoherence of singlet-triplet qubits in Si/SiGe quantum dots
• Probabilistic teleportation of a quantum dot spin qubit
• Hamiltonian engineering for robust quantum state transfer and qubit readout in cavity QED
• Modular nanomagnet design for spin qubits confined in a linear chain
• Anisotropy with respect to the applied magnetic field of spin qubit decoherence times
• Resonant single and multi-photon coherent transitions in a detuned regime
• Sign-switching of superexchange mediated by few electrons under non-uniform magnetic field
• Spin manipulation and spin dephasing in quantum dot integrated with a slanting magnetic field
• Superradiant-like dynamics by electron shuttling on a nuclear-spin island
• Probe-assisted spin manipulation in one-dimensional quantum dots