量子绝热捷径技术在三波导耦合器设计中的应用

Three-waveguide couplers designed by shortcut to adiabaticity

通过将量子无摩擦动力学与绝热消除结合实现了量子绝热捷径技术在光波导耦合器中的设计.为了使该方案更实际可行,引入了幺正变换,以便对波导的宽度以及相邻波导之间的间距进行设计,并利用光束传播法对三波导耦合器进行模拟验证.模拟结果表明,相比于绝热耦合,利用绝热捷径设计的耦合器可以在传输长度缩短4倍的情况下实现能量的有效耦合.该方案可适用于量子信息处理和集成光学领域.

A shortcut-to-adiabaticity protocol is proposed to design short light directional couplers by combining adiabatic elimination and counter-diabatic driving for three-level systems.For more practical implementations,we consider unitary transformation to design the waveguide width and adjacent waveguide pitch.In our example,a three-waveguide coupler is simulated by beam propagation method.Compared with adiabatic couplers,the designed coupler is shorter by four times.This approach is applicable to quantum information processing and integrated optics.