Room-Temperature Photonic Logical Qubits via Second-Order Nonlinearities

摘要: Recent progress in nonlinear optical materials and microresonators has brought quantum computing with bulk nonlinearities into the realm of possibility. This platform is great interest, not only because photonics an obvious choice for networks, but also it may be feasible route to information processing at room temperature. We introduce a paradigm room-temperature photonic logic that significantly simplifies realization various circuits, particular, error correction. It uses strongest available nonlinearity, namely $\chi^{(2)}$ susceptibility. The key element three-mode resonator implements programmable bosonic gates. show just two these elements suffice complete, compact error-correction circuit on code, without need measurement or feed-forward control. An extrapolation current circuits indicates such circuitry should achievable within next decade.