  We experimentally generate arbitrary time-bin qubits using continuous-wave
light. The advantage unique to our qubit is its compatibility with
deterministic continuous-variable quantum information processing. This
compatibility comes from its optical coherence with continuous waves,
well-defined spatio-temporal mode, and frequency spectrum within the
operational bandwidth of the current continuous-variable technology. We also
demonstrate an efficient scheme to characterize time-bin qubits via eight-port
homodyne measurement. This enables the complete characterization of the qubits
as two-mode states, as well as a flexible analysis equivalent to the
conventional scheme based on a Mach-Zehnder interferometer and
photon-detection.
