All-electrical coherent control of the exciton states in a single quantum dot

Abstract

We demonstrate high-fidelity reversible transfer of quantum information from the polarisation of photons into the spin-state of an electron-hole pair in a semiconductor quantum dot. Moreover, spins are electrically manipulated on a sub-nanosecond timescale, allowing us to coherently control their evolution. By varying the area of the electrical pulse, we demonstrate phase-shift and spin-flip gate operations with near-unity fidelities. Our system constitutes a controllable quantum interface between flying and stationary qubits, an enabling technology for quantum logic in the solid-state.

References in corpus (7)

• Quantum Computing
• Driven coherent oscillations of a single electron spin in a quantum dot
• Free-Space distribution of entanglement and single photons over 144 km
• Electric-field-induced coherent coupling of the exciton states in a single quantum dot
• Coherence of an Entangled Exciton-Photon State
• Evolution of entanglement within classical light states
• Coherent transfer of light polarization to electron spins in a semiconductor

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• Path-dependent initialization of a single quantum dot exciton spin in a nano-photonic waveguide
• Voltage control of electron-nuclear spin correlation time in a single quantum dot
• Engineering quantum dots for electrical control of the fine structure splitting
• Free induction decay of a superposition stored in a quantum dot
• Biexciton Initialization by Two-Photon Excitation in Site-Controlled Quantum Dots: the Complexity of the Antibinding State Case
• A Mathematical Aspect of A Tunnel-Junction for Spintronic Qubit