Generation of maximally-polarization-entangled photons on a chip
Sergei V. Zhukovsky, L. G. Helt, Dongpeng Kang, Payam Abolghasem, Amr S. Helmy, John E. Sipe · Physical Review A · 2012
We propose a method of generating maximally-polarization-entangled states by type-II spontaneous parametric down-conversion in Bragg reflection waveguides. Analytic expressions for the group velocities of down-converted modes are used to engineer zero group-velocity mismatch at the operating point, making the spectra of photons within a down-converted pair indistinguishable and thus leading to a maximally-polarization-entangled state. The results can be used for the creation and manipulation of polarization-entangled qubits entirely on a chip.