Initialization of a spin qubit in a site-controlled nanowire quantum dot

Abstract

A fault-tolerant quantum repeater or quantum computer using solid-state spin-based quantum bits will likely require a physical implementation with many spins arranged in a grid. Self-assembled quantum dots (QDs) have been established as attractive candidates for building spin-based quantum information processing devices, but such QDs are randomly positioned, which makes them unsuitable for constructing large-scale processors. Recent efforts have shown that quantum dots embedded in nanowires can be deterministically positioned in regular arrays, can store single charges, and have excellent optical properties, but so far there have been no demonstrations of spin qubit operations using nanowire quantum dots. Here we demonstrate optical pumping of individual spins trapped in site-controlled nanowire quantum dots, resulting in high-fidelity spin-qubit initialization. This represents the next step towards establishing spins in nanowire quantum dots as quantum memories suitable for use in a large-scale, fault-tolerant quantum computer or repeater based on all-optical control of the spin qubits.

References in corpus (5)

• Bright single-photon sources in bottom-up tailored nanowires
• Towards quantum dot arrays of entangled photon emitters
• Ultrafast optical control of entanglement between two quantum dot spins
• Hole Spin Pumping and Re-pumping in a p-type δ-doped InAs Quantum Dot
• Towards Quantum Repeaters with Solid-State Qubits: Spin-Photon Entanglement Generation using Self-Assembled Quantum Dots

Cited by in corpus (6)

• Anisotropies of the g-factor tensor and diamagnetic coefficient in crystal-phase quantum dots in InP nanowires
• Ultrafast Coherent Manipulation of Trions in Site-Controlled Nanowire Quantum Dots
• Optical pumping and initialization of a hole spin in site-controlled InGaAs pyramidal quantum dots
• Ultrafast spin initialization in a gated InSb nanowire quantum dots
• Spin-selective resonant tunneling induced by Rashba spin-orbit interaction in semiconductor nanowire
• Self-aligned pillar arrays embedding site-controlled single quantum dots for enhanced non-classical light emission