Biphoton frequency comb (BFC) having quantum entanglement in a high dimensional system is widely applicable to quantum communication and quantum computation. However, a dozen mode realized so far has not been enough to realize its full potential. Her
e, we show a massive-mode BFC with polarization entanglement experimentally realized by a nonlinear optical waveguide resonator. The generated BFC at least 1400 modes is broad and dense, that strongly enhances the advantage of BFC. We also demonstrated a versatile property of the present BFC, which enables us to prepare both the frequency-multiplexed entangled photon pair and the high dimensional hyperentangled one. The versatile, stable and highly efficient system with the massive-mode BFC will open up a large-scale photonic quantum information platform.
