Optical Quantum Computation utilizing Weak Nonlinearities: A little goes a long way

摘要

We present an approach to optical QIP based on the use of weak nonlinearities and homodyne measurements. We show how this approach provides the fundamental building blocks for highly efficient non-absorbing single photon number resolving detectors, two qubit parity detectors, Bell state measurements and finally near deterministic control-not (CNOT) gates. These are essential QIP devices.