Universal quantum gates lie at the heart of designing computer. Here two compact circuits for implementing post-selected controlled-phase-flip (CPF) gate and Toffoli with linear optics are constructed assisted by one single photons, respectively. The current existing maximum success probability 1/4 optical CPF is achieved resorting to an ancillary photon rather than entangled pair or photons. R...

I propose encoder and decoder architectures for entanglement-assisted (EA) quantum low-density parity-check (LDPC) codes suitable for all-optical implementation. I show that two basic gates needed for EA quantum error correction, namely, controlled-NOT (CNOT) and Hadamard gates can be implemented based on Mach-Zehnder interferometer. In addition, I show that EA quantum LDPC codes from balanced ...

All-optical soliton logic operations, facilitated by incoherent interactions of multiple spatial solitons with nonlinear interfaces, are proposed and analyzed. A particlelike model, validated by beam propagation simulations, was developed for calculating the soliton trajectories and was employed for the analysis of the soliton-based logic gates. © 2005 Optical Society of America OCIS codes: 190...

Optical computing and optical neural network have gained increasing attention in recent years because of their potential advantages parallel processing at the speed light low power consumption by comparison with electronic computing. The implementation fundamental building blocks a digital computer, i.e. logic gates, has been investigated extensively past few decades. gate is an alternative app...