METHODS, SYSTEMS, AND APPARATUS FOR PROGRAMMABLE QUANTUM PHOTONIC PROCESSING

摘要

A programmable photonic integrated circuit implements arbitrary linear optics transformations in the spatial mode basis with high fidelity. Under a realistic fabrication model, we analyze programmed implementations of the CNOT gate, CPHASE gate, iterative phase estimation algorithm, state preparation, and quantum random walks. We find that programmability dramatically improves device tolerance to fabrication imperfections and enables a single device to implement a broad range of both quantum and classical linear optics experiments. Our results suggest that existing fabrication processes are sufficient to build such a device in the silicon photonics platform.

主权项

1. A photonic integrated circuit for performing quantum information processing, the photonic integrated circuit comprising:
a semiconductor substrate; a plurality of interconnected variable beam splitters, fabricated in the semiconductor substrate, to perform at least one linear optical transformation on a plurality of optical modes coupled into the plurality of interconnected variable beam splitters; a plurality of detectors, in optical communication with the plurality of variable beam splitters, to measure an output state of the plurality of optical modes; and control circuitry, operably coupled to the plurality of interconnected variable beam splitters and to the plurality of detectors, to determine a fidelity of the output state of the plurality of optical modes to an ideal output state of the plurality of optical modes and to adjust a phase setting of at least one variable beam splitter in the plurality of interconnected variable beam splitters so as to increase the fidelity of the output state of the plurality of optical modes to the ideal output state of the plurality of optical modes.