High fidelity all-optical control of quantum dot spins: detailed study of the adiabatic approach

Abstract

Confined electron spins are preferred candidates for embodying quantum information in the solid state. A popular idea is the use of optical excitation to achieve the ``best of both worlds'', i.e. marrying the long spin decoherence times with rapid gating. Here we study an all-optical adiabatic approach to generating single qubit phase gates. We find that such a gate can be extremely robust against the combined effect of all principal sources of decoherence, with an achievable fidelity of 0.999 even at finite temperature. Crucially this performance can be obtained with only a small time cost: the adiabatic gate duration is within about an order of magnitude of a simple dynamic implementation. An experimental verification of these predictions is immediately feasible with only modest resources.

References in corpus (10)

• Theory of fast optical spin rotation in a quantum dot based on geometric phases and trapped states
• Anticrossings in Foerster Coupled Quantum Dots
• Population inversion of driven two-level systems in a structureless bath
• Landau-Zener transitions in qubits controlled by electromagnetic fields
• Optimal strategy for a single-qubit gate and trade-off between opposite types of decoherence
• Phonon-induced decoherence for a quantum dot spin qubit operated by Raman passage
• Selective spin coupling through a single exciton
• Quantum Computing with Spin Qubits Interacting Through Delocalized Excitons: Overcoming Hole Mixing
• Interplay and optimization of decoherence mechanisms in the optical control of spin quantum bits implemented on a semiconductor quantum dot
• Global Optical Control of a Quantum Spin Chain

Cited by in corpus (11)

• Fast optical preparation, control and read-out of single quantum dot spin
• Prospects for measurement-based quantum computing with solid state spins
• Hybrid solid state qubits: the powerful role of electron spins
• Light-hole transitions in quantum dots: realizing full control by highly focused optical-vortex beams
• Theory of two-photon processes in quantum dots: coherent evolution and phonon-induced dephasing
• Effect of detuning on the phonon induced dephasing of optically driven InGaAs/GaAs quantum dots
• Robust adiabatic approach to optical spin entangling in coupled quantum dots
• Quenching of phonon-induced processes in quantum dots due to electron-hole asymmetries
• Strong coupling, weak impact: Phonon coupling versus pure dephasing in the photon statistics of cooperative emitters
• Overcoming phonon-induced dephasing for indistinguishable photon sources
• Entanglement of Remote Spins with Unequal Coupling to an Optically Active Mediator