Controllable entanglement and polarization phase gate in coupled double quantum-well structures.
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.
Yang
Wen-Xing
WX
Institute of Photonics Technologies, National Tsing-Hua University, Hsinchu 300, Taiwan.
Lee
Ray-Kuang
RK