Deterministic Two-photon Controlled Phase Gate By Exploiting Nonlinear Pi-Phase Shift in Photonic Molecule Generations

摘要

To resolve the intrinsic trade-off between the deterministic nature and scalability of controlled phase gate implementationin the linear optics regime, we propose a novel deterministic two-photon controlled phase gate schemein chiral quantum nanophotonics. The essential ingredient here is that, a non-linear π-phase shift is imprintedduring the photonic molecule generations. On one hand, the gate operates in a deterministic way without theassistance of probabilistic ancilla qubit measurement. On the other hand, the gate implementation is of lowcomplexity to be highly scalable. To date, the chiral coupling is readily underpinned by the advent of directionalemission technique. Potential implementation platforms include QD, superconducting qubit, Rydberg atom, orN-V center that is coupled to a PhC waveguide, transmission line, or optical fiber.