Controllable Multiregister Transport on a Photonic Chip

Abstract

Quantum transport is significant to understanding the evolution of states of particles in nature. Quantum transport, based on the fashion of adiabatic pumping and fully engineered graph, enables the quantum-enhanced capabilities of energy transport and quantum information processing. However, in large fully connected networks with multiple registers, the reliability and scalability of transport are limited by the unavoidable noises and crosstalk induced by the free interaction enabled in real space. Here, we propose and experimentally demonstrate a novel multiregister transport with a controllable interaction on a photonic chip. The remote locking registers, located at the boundaries sharing the common channel, can freely interact, supported by the bilocalized states under the norm of local magnetic fields. Excited photons are transferred effectively from one register to the locked one, which are both in the same subspace without crosstalk of different parties. Moreover, quantum correlation of photon states can be well preserved in the multiregister transport network. Our results of on-demand multiregister transport network with low-crosstalk integrated in the photonic chip, which may shed light on the avenue for building the quantum gate parallelism, is a promising route toward the scalable quantum computing and deep quantum circuits.