NONLINEAR ELECTROMAGNETIC QUANTUM INFORMATION PROCESSING

摘要

Nonlinear electromagnetic elements (210) can efficiently implement quantum information processing tasks such as controlled phase shifts, non-demolition state detection, quantum subspace projections, non-demolition Bell state analysis, heralded state preparation, quantum non-demolition encoding, and fundamental quantum gate operations. Direct use of electromsgnetic non-linearity can amplify small phase shifts and use feed forward systems (900) in a near deterministic manner with high operating efficiency. Measurements using homodyne detectors (530) can cause near deterministic projection of input states on a Hilbert subspace identified by the measurement results. Feed forward operation can then alter the projected state if desired to achieve a desired output with near 100% efficiency.