8. Electron on right dot Electron on left dot Charge Electron localization Singly-charged quantum dot pair Current No current Current Superconducting flux qubit Josephson junction Charged capacitor Uncharged capacitor Charge Superconducting charge qubit Josephson junction Down Up Spin Atomic spin Optical lattices Down Up Spin Nuclear spin addressed through NMR Nucleus One electron No electron Charge Electron number Down Up Spin Electronic spin Electrons Phase-squeezed state Amplitude-squeezed state Quadrature Squeezed light Coherent state of light Late Early Time of arrival Time-bin encoding Single photon state Vacuum Photon number Photon number Vertical Horizontal Polarization of light Polarization encoding Single photon ( Fock states ) "1" "0" Information support Name Physical support