Methods, systems, and apparatus for programmable quantum photonic processing
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
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.
-
Citations
22 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method of performing quantum information processing, the method comprising:
-
(A) coupling a plurality of optical modes into a plurality of interconnected variable beam splitters fabricated in a semiconductor substrate so as to perform at least one linear optical transformation on the plurality of optical modes; (B) detecting the plurality of optical modes at an output of the plurality of interconnected variable beam splitters; (C) determining a fidelity of the output state of the plurality of optical modes to an ideal output state of the plurality of optical modes; and (D) adjusting at least one phase of at least one variable beam splitter in the plurality of interconnected variable beam splitter 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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A photonic integrated circuit for performing quantum information processing, the photonic integrated circuit comprising:
-
a semiconductor substrate; a plurality of interconnected Mach-Zehnder interferometers, 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 Mach-Zehnder interferometers, the plurality of interconnected Mach-Zehnder interferometers being characterized by a distribution of splitting ratios having a first variance and by a distribution of optical losses having a second variance; a plurality of detectors, in optical communication with the plurality of Mach-Zehnder interferometers, to measure an output state of the plurality of optical modes; and control circuitry, operably coupled to the plurality of interconnected Mach-Zehnder interferometers 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 Mach-Zehnder interferometer in the plurality of interconnected Mach-Zehnder interferometers 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; and at least one feedback loop, in optical communication with the plurality of interconnected Mach-Zehnder interferometers, to guide at least one optical mode from an output of the plurality of interconnected Mach-Zehnder interferometers to an input of the plurality of interconnected Mach-Zehnder interferometers, wherein the first variance and the second variance reduce the fidelity of the output state of the plurality of optical modes to the ideal output state of the plurality of optical modes. - View Dependent Claims (22)
-
Specification