National University of Defense Technology

Xiaogang Qiang

Junjie Wu

Yang Wang

Ping Xu

Xiang Fu

Jiangfang Ding

Yizhi Wang

Mingtang Deng

Anqi Huang

The present invention discloses an integrated photonic chip structure for universal quantum walk simulation which combines the multiphoton source that can generate the spatially entangled multi-photon state and the linear optical network that can implement the unitary transformation, and establishes mapping between on-chip spatial-entangled multi-photon state and quantum walk state and mapping between on-chip linear optical unitary transformation and the evolution process of multi-particle quantum walk. By manipulating the spatially entangled multi-photon state generated via the multi-photon sources and the optical unitary transformation implemented via the universal linear optical networks, the chip structure can implement universal quantum walk simulation with the control over all parameters of multiple-particle quantum walks including such as evolution Hamiltonian, evolution time, initial evolution state and particle properties (i.e., particle indistinguishability and particle exchange symmetry).

Integrated photonic chip structure for universal quantum walk simulation

The present invention discloses a method for calibrating controllable phase shifters in a multi-stage staggered Mach-Zehnder interferometer structure on an optical chip, aiming to solve the problem of calibrating the controllable phase shifters in a configurable optical network of the multi-stage staggered Mach-Zehnder interferometers. The technical solution is to calibrate the controllable phase shifters that can be calibrated in the optical network; and then to constitute calibration conditions for and calibrate inner phase shifters that has not been; and finally to constitute calibration conditions for and calibrate outer phase shifters that is not calibrated.

Method for calibrating controllable phase shifters in multi-stage staggered Mach-Zehnder interferometer on optical chip

Growing community of inventors

Hunan, China

Xiaogang Qiang