Single photoelectron spin detection and angular momentum transfer in a gate defined quantum dot

Abstract

Recent innovations in fabricating nanoscale confined spin systems have enabled investigation of fundamental quantum correlations between single quanta of photons and matter states. Realization of quantum state transfer from photon polarization to electron spin using gate defined quantum dots (QDs) may give evidence of preserved coherence of angular momentum basis states at the photon-spin interface. The interface would enlarge the concept of quantum information technology, in which single photogenerated electron spins are manipulated with the dots, but this remains a serious challenge. Here, we report the detection of single electron spins generated by polarized single photons via a double QD (DQD) to verify the angular momentum transfer from single photons to single electrons. Pauli spin blockade (PSB) is used to project the photoelectron spin state onto the up or down spin state. Our result promises the realization of coherent quantum state transfer and development of hybrid photon and spin quantum technology.

20 pages, 5 figures

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• Coherent electron-spin-resonance manipulation of three individual spins in a triple quantum dot
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• A single eletron-photon pair generation from a single polarization-entangled photon pair

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• Enhanced Electron Spin Coherence in a GaAs Quantum Emitter
• Coherent interaction of a-few-electron quantum dot with a terahertz optical resonator
• Stable electroluminescence in ambipolar dopant-free lateral p-n junctions
• Laser-patterned submicron Bi2Se3-WS2 pixels with tunable circular polarization at room temperature
• All-optical ultrafast arbitrary rotation of hole orbital qubits with direct phase control
• Electron g-factor determined for quantum dot circuit fabricated from (110)-oriented GaAs quantum well
• Study of Microwave Assisted CNOT Gate