Coherent Transfer of Light Polarization to Electron Spins in a Semiconductor
Hideo Kosaka, Hideki Shigyou, Yasuyoshi Mitsumori, Yoshiaki Rikitake, Hiroshi Imamura, Takeshi Kutsuwa, Koichiro Arai, Keiichi Edamatsu · Physical Review Letters · 2008
We demonstrate that the superposition of light polarization states is coherently transferred to electron spins in a semiconductor quantum well. By using time-resolved Kerr rotation, we observe the initial phase of Larmor precession of electron spins whose coherence is transferred from light. To break the electron-hole spin entanglement, we utilized the big discrepancy between the transverse g factors of electrons and light-holes. The result encourages us to make a quantum media converter between flying photon qubits and stationary electron-spin qubits in semiconductors.