Yang Wen-Xing, Lee Ray-Kuang
Institute of Photonics Technologies, National Tsing-Hua University, Hsinchu 300, Taiwan.
Opt Express. 2008 Oct 27;16(22):17161-70. doi: 10.1364/oe.16.017161.
By analyzing the nonlinear optical response in an asymmetric coupled double quantum well structure based on the intersubband transitions, we show that a giant Kerr nonlinearity with a relatively large cross-phase modulation coefficient can be used to produce efficient photonphoton entanglement and implement an all-optical two-qubit quantum polarization phase gate. We also demonstrate that such photon-photon entanglement is practically controllable and may facilitate more practical applications in all-optical quantum information and computation.
