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Updated: Feb 17, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Single electron-photon pair creation from a single polarization-entangled photon pair
Kazuyuki Kuroyama1, Marcus Larsson2, Sadashige Matsuo2
1Department of Applied Physics, The University of Tokyo, Bunkyo-ku, Tokyo, Japan. kuroyama@meso.t.u-tokyo.ac.jp.
Abstract:
Quantum entanglement between different forms of qubits is an indication of the universality of quantum mechanics. Entanglement transfer between light and matter, especially photon and spin, has long been studied as the central concept, but it remains technically challenging for single photons and spins. In this paper, we show paired generation of a single electron in a GaAs quantum dot and a single photon from a single polarization-entangled photon pair. We measure temporal coincidence between the single photo-electron detection and the single photon detection. Considering a single photon polarization is converted to an electron spin via an optical selection rule, the present result indicates the capability of photon to spin entanglement transfer. This may be useful to explore the physics of entanglement transfer and also for applications to quantum teleportation based quantum communication.
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