A method for balancing the paths of a two-photon interferometer
Scott E. Spence, D.C. Stoudt, Nancy L. Swanson, Allen Parks, Frank E. Peterkin · Review of Scientific Instruments · 2000
We present and demonstrate a method for balancing the two paths of a two-photon interferometer of the Hong-Ou-Mandel (HOM) variety. This method removes the difficulties of balancing the paths in this type of interferometer where a type-I crystal is used for the generation of the entangled photon pairs. Using this method we show that we are consistently able to balance the ∼2000 mm path lengths in our HOM interferometer on average to within ∼60 μm.